China’s lowland rural rivers are facing severe eutrophication problems due to excessive phosphorus(P)from anthropogenic activities.However,quantifying P dynamics in a lowland rural river is challenging due to its com...China’s lowland rural rivers are facing severe eutrophication problems due to excessive phosphorus(P)from anthropogenic activities.However,quantifying P dynamics in a lowland rural river is challenging due to its complex interaction with surrounding areas.A P dynamic model(River-P)was specifically designed for lowland rural rivers to address this challenge.This modelwas coupled with the Environmental Fluid Dynamics Code(EFDC)and the Phosphorus Dynamic Model for lowland Polder systems(PDP)to characterize P dynamics under the impact of dredging in a lowland rural river.Based on a two-year(2020-2021)dataset from a representative lowland rural river in the Lake Taihu Basin,China,the coupled model was calibrated and achieved a model performance(R^(2)>0.59,RMSE<0.04 mg/L)for total P(TP)concentrations.Our research in the study river revealed that(1)the time scale for the effectiveness of sediment dredging for P control was~300 days,with an increase in P retention capacity by 74.8 kg/year and a decrease in TP concentrations of 23%after dredging.(2)Dredging significantly reduced P release from sediment by 98%,while increased P resuspension and settling capacities by 16%and 46%,respectively.(3)The sediment-water interface(SWI)plays a critical role in P transfer within the river,as resuspension accounts for 16%of TP imports,and settling accounts for 47%of TP exports.Given the large P retention capacity of lowland rural rivers,drainage ditches and ponds with macrophytes are promising approaches to enhance P retention capacity.Our study provides valuable insights for local environmental departments,allowing a comprehensive understanding of P dynamics in lowland rural rivers.This enable the evaluation of the efficacy of sediment dredging in P control and the implementation of corresponding P control measures.展开更多
This study,based on the theory of shifting essence and changing Qi in Inner Canon of Huangdi,deeply explores the theoretical basis,operation method of Conception Vessel Dredging Therapy and its influence on human heal...This study,based on the theory of shifting essence and changing Qi in Inner Canon of Huangdi,deeply explores the theoretical basis,operation method of Conception Vessel Dredging Therapy and its influence on human health.Through case analysis and the statistical analysis of medical records during the pandemic,it reveals the remarkable effects of this method in regulating the endocrine system,improving metabolism,and relieving physical and mental diseases.It provides a theoretical and practical basis for the application of traditional Chinese medicine anti-aging therapy in the modern health field,and helps to explore new ways to delay aging and improve physical and mental health.展开更多
BACKGROUND There is a lack of integrated Chinese and Western medicine treatment regimens supported by high-level evidence-based medicine in the maintenance therapy phase of metastatic colorectal cancer(mCRC).Based on ...BACKGROUND There is a lack of integrated Chinese and Western medicine treatment regimens supported by high-level evidence-based medicine in the maintenance therapy phase of metastatic colorectal cancer(mCRC).Based on the traditional Chinese medicine theory of“Yin tumor”,we believe that“Yang does not transform Yin,and it is blocked in the intestines”is the core pathogenesis of mCRC.Based on the basic treatment principle of“warming Yang and dredging intestines”,we developed the Quxie Capsule.Previous randomized controlled clinical trials demonstrated that the Quxie Capsule can significantly prolong the overall survival of patients with mCRC,but it remains to be verified whether the combination of the“warming Yang and dredging intestines method”prescription with Western medicine standard regimen can prolong the efficacy and safety of the mCRC during the period of maintenance therapy.AIM To confirm and clinically validate that the combination of“warming Yang and dredging intestines method”prescription with Western medicine standard regimen can prolong progression-free survival(PFS)during maintenance treatment of mCRC.The safety of“warming Yang and dredging intestines method”prescription is also assessed.METHODS The study has a prospective,open-label,randomized,controlled study design.Patients have been recruited beginning November 2023 from Xiyuan Hospital of China Academy of Chinese Medical Sciences,Guang’anmen Hospital of China Academy of Chinese Medical Sciences,Dongfang Hospital of Beijing University of Chinese Medicine,and Xinjiang Uygur Autonomous Region Hospital of Traditional Chinese Medicine.The study period is from March 2024 to March 2026.After screening in outpatient clinics or wards,subjects who met the inclusion criteria are randomized into the treatment or control group in a 2:1 ratio.The treatment group receives the“warming Yang and dredging intestines method”formula combined with Western standard maintenance therapy.The control group receives Western standard maintenance therapy formulated by the investigators based on the Chinese Society of Clinical Oncology guidelines for colorectal cancer.All participants receive treatment until the occurrence of disease progression,death,or unmanageable adverse effects,with post-treatment monitoring continued until mortality.An independent panel of chief physicians with extensive clinical experience evaluates the progression of the disease.RESULTS This study aims to clarify whether the combination of warming Yang and dredging intestines method formula with standard Western medicine regimens can prolong PFS during maintenance therapy for mCRC and whether the treatment has a favorable safety profile.The goal is to provide a combined Chinese and Western medicine treatment option for clinical physicians and mCRC patients.Notably,with the actual sample size,this study has an 80%probability of detecting a significant difference if a true difference exists.Small sample sizes may lead to increased instability of the results of subgroup analyses,and may also result in findings that are only applicable to patients with characteristics highly similar to those of the present study population(e.g.,specific genotypes,therapeutic backgrounds,etc.),making it difficult to generalize to the broader mCRC population.In the future,it may be possible to expand the sample size based on this study to further validate the efficacy and safety of combining Chinese and Western medicine in the treatment of mCRC.Basic research on the therapeutic combination of warming Yang and dredging intestines method formula and standard Western regimen will be performed in parallel.CONCLUSION This study aims to clarify whether the combination of warming Yang and dredging intestines method formula with standard Western medicine regimens can prolong PFS during maintenance therapy for mCRC and whether the treatment has a favorable safety profile.展开更多
With the development of social and economic modernization, China has achieved good results in all aspects, but there are still some deficiencies in the construction of river regulation, dredging and other related proj...With the development of social and economic modernization, China has achieved good results in all aspects, but there are still some deficiencies in the construction of river regulation, dredging and other related projects. Making full use of modern science and technology and giving full play to the advantages of advanced technologies such as sludge solidification can further grasp the basic requirements of river dredging and dredging projects and improve various technical points. Therefore, in the process of actual analysis and research, it is very important to know the specific scheme of sludge treatment and make scientific arrangements for the current work.展开更多
An experiment for studying the effects of sediment dredging on denitrification in sediments was carried out through a one-year incubation of undredged （control） and dredged cores in laboratory. Dredging the upper 30...An experiment for studying the effects of sediment dredging on denitrification in sediments was carried out through a one-year incubation of undredged （control） and dredged cores in laboratory. Dredging the upper 30 cm of sediment can significantly affect physico-chemical characteristics of sediments. Less degradation of organic matter in the dredged sediments was found during the experiment. Denitrification rates in the sediments were estimated by the acetylene blockage technique, and ranged from 21.6 to 102.7 nmol N2/（g dry weight （dw）-hr） for the undredged sediment and from 6.9 to 26.9 nmol N2/（g dw-hr） for dredged sediments. The denitrification rates in the undredged sediments were markedly higher （p 〈 0.05） than those in the dredged sediments throughout the incubation, with the exception of February 2006. The importance of various environmental factors on denitrification was assessed, which indicated that denitrification was regulated by temperature. Nitrate was probably the key factor limiting denitrification in both undredged and dredged sediments. Organic carbon played some role in determining the denitrification rates in the dredged sediments, but not in the undredged sediments. Sediment dredging influenced the mineralization of organic matter and denitrification in the sediment; and therefore changed the pattern of inherent cycling of nitrogen.展开更多
A laboratory experiment was carried out through a six-month incubation of undredged （control） and dredged cores to study the effect of sediment dredging on phosphorus （P） release from the sediment in the Taihu Lak...A laboratory experiment was carried out through a six-month incubation of undredged （control） and dredged cores to study the effect of sediment dredging on phosphorus （P） release from the sediment in the Taihu Lake. During the experiment, dredging the upper 30 cm layer could efficiently reduce the interstitial PO4^3-P concentration and different P forms in the sediment. The P fluxes of the undredged and dredged cores ranged from -5.1 to 3047.6 and -60.7 to 14.4μg·m^-2·d^-1, respectively. The fluxes of the dredged cores were generally lower than those of the control. Differences in the fluxes between the dredged and undredged cores were statistically significant （P 〈 0.05） from March to June 2006. The sediment P in the dredged cores had a lower release potential than that in the control. Dredging can be considered as a useful measure for rehabilitating the aquatic ecosystem after the external P loading in the Talhu Lake catchment was efficiently reduced.展开更多
Algae-caused black bloom （also known as black water agglomerate） has recently become a critical problem in some Chinese lakes.It has been suggested that the occurrence of algae-caused black bloom was caused by the c...Algae-caused black bloom （also known as black water agglomerate） has recently become a critical problem in some Chinese lakes.It has been suggested that the occurrence of algae-caused black bloom was caused by the cooperation of nutrient-rich sediment with dead algae,and sludge dredging was adopted to control black bloom in some lakes of China.In this article,based on the simulation of black bloom using a Y-shape apparatus for modeling natural conditions,both un-dredged and dredged sites in three areas of Taihu Lake,China were studied to estimate the effects of dredging on the prevention and control of black bloom.During the experiment,drained algae were added to all six sites as an additional organic load;subsequently,the dissolved oxygen decreased rapidly,dropping to 0 mg/L at the sediment-water interface.Black bloom did not occur in the dredged sites of Moon Bay and Nan Quan,whereas all three un-dredged sites at Fudu Port,Moon Bay and Nan Quan experienced black bloom.Black bloom also occurred at the dredged site of Fudu Port one day later than at the other sites,and the odor and color were lighter than at the other locations.The color and odor of the black water mainly result from the presence of sulfides such as metal sulfides and hydrogen sulfide,among other chemicals,under reductive conditions.The color and odor of the water,together with the high concentrations of nutrients,were mainly caused by the decomposition of the algae and the presence of nutrient-rich sediment.Overall,the removal of the nutrient-rich sediment by dredging can prevent the occurrence and control the degree of algae-caused black bloom in Taihu Lake.展开更多
For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based model. First, the residual flow and sediment transport circulations are analysed for...For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has emerged after a longterm model simulation. Results are compared to the Western Scheldt estuary, which forms the inspiration for this study. Subsequently, different dredge and dump scenarios are modelled, according to a conceptual model, in which ebb- and flood-channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system into a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact of human interventions.展开更多
OBJECTIVE: To investigate the correlativity between the changes of blood measures related to blood stasis blocking collaterals and gene expression levels of angiotensin-converting enzyme(ACE)and ACE2 ofrenal cortex in...OBJECTIVE: To investigate the correlativity between the changes of blood measures related to blood stasis blocking collaterals and gene expression levels of angiotensin-converting enzyme(ACE)and ACE2 ofrenal cortex in diabetic rats with stasis blocking collaterals syndrome, as well as the effectof stasis removing and collaterals dredging.METHODS: Male Sprague-Dawley rats were divided randomly into normal control group(C group),high-carbohydrate-fat control group(H group) and streptozotocin(STZ)-injecting group. The diabeticrats were induced from rats in the STZ-injecting groupby high-carbohydrate-fat diet combined with STZ intraperitoneal injection, with sustained high-carbohydrate-fat diet fed afterwards, and were further divided into model group(M group)and Chinese medicine of stasis removing and collaterals dredging group(Z group). Rats in the Z group were fed with stasis-removing-and-collaterals-dredging herbal granule suspension intragastrically daily for 16 weeks, while drinking water of corresponding volume was administrated to the rats in other groups. At the end of the 16 th week after successful establishment of models, the ultrastructures of glomeruli in different groups were detected by a transmission electron microscopy; and blood measures related to blood stasis blocking collaterals, including lipid profile and blood viscosity measures, were tested, as well as the relative gene expressions of ACE and ACE2.RESULTS: Changes in ultrastructures of glomeruli in the M group were characterized by lack of clarity in structure and occasional thickening of glomerular basement membrane and extensive fusion in foot processes. The correlation analysis showed that there were positive correlations between lipid profile, blood viscosity, and the ACE mRNA expression levels in the M group(P<0.05), except for cholesterol. And except for triglyceride, the blood measures were in negative correlation with the ACE2 mRNA expression levels in the M group(P<0.05).Compared with the C and H groups, the lipid profile, plasma viscosity and blood viscosity were significantly higher(P<0.01). All the above-mentioned measures were significantly improved in the Z group rats(P<0.05). ACE mRNA expression was significantly higher in the M group thanin the C group(P<0.05). ACE2 mRNA level was significantly lower in the M group than in the C and H groups(P<0.01)and its levelin the Z group was higher than that in the M group(P<0.01).CONCLUSION: Blood measuresrelated to blood stasis blocking collaterals had positive linear correlations with ACE mRNAexpression and negative linear correlations with ACE2 mRNA expression in the M group. Chinese recipe of stasis removing and collaterals dredging could play a renal protecting role for diabetic rats by reducing lipid profile and blood viscosity, down-regulating ACE mRNA expression and up-regulating ACE2 mRNA expression.展开更多
Channel dredging in estuaries increases water depth and subsequently impacts sediment dynamics and morphology. The Jiaojiang River Estuary is dredged frequently owing to heavy shipping demands. In this study,the effec...Channel dredging in estuaries increases water depth and subsequently impacts sediment dynamics and morphology. The Jiaojiang River Estuary is dredged frequently owing to heavy shipping demands. In this study,the effects of different dredging schemes on siltation were assessed through numerical modeling. The sediment model of the Jiaojiang River Estuary utilized an optimized bottom boundary layer model that considered the bed sediment grain size and fluid mud, and this model was calibrated using field data. Result reveal that channel dredging modifies the flow velocity inside and around the channel by changing the bathymetry;subsequently, this affects the residual current, bed stress, suspended sediment concentration, and sediment fluxes. Increasing the dredging depth and width increases the net sediment fluxes into the channel and dredging depth has a greater influence on the channel siltation thickness. When the dredging depth is 8.4 m or11.4 m, the average siltation thickness of the channel is 0.07 m or 0.15 m per mouth respectively. The parallel movement of the channel has small effects on the siltation volume during the simulation period. The sediment deposits in the channel primarily originates from the tidal flats, through bottom sediment fluxes. Vertical net circulation has a dominant impact on siltation because the difference of horizontal current of each layer on the longitudinal section of the channel increases, which intensifies the lateral sediment transport between the shoal and channel. The influence of vertical frictional dissipation on the lateral circulation at the feature points accounts for more than 50% before dredging, while the non-linear advective term is dominant after dredging. Tidal pumping mainly affects the longitudinal sediment fluxes in the channel. These results can be used for channel management and planning for similar estuaries worldwide.展开更多
Prediction of channel dredging volume is critical for project cost estimation. However, many proposed approximate methods are not accurate. This paper presents a novel numerical method to accurately calculate the dred...Prediction of channel dredging volume is critical for project cost estimation. However, many proposed approximate methods are not accurate. This paper presents a novel numerical method to accurately calculate the dredg- ing volume using a 3D stratum model (DSM) and a channel surface model. First, the 3D DSM is constructed rapidly yet accurately from non-uniform rational B-splines (NURBS) surfaces through Boolean operation between a physical terrain model and a stratum surfaces model. Then, a parametric channel surface model is built from cross-section data and a channel center line using code implemented in the VC++ programming language. Finally, the volumes of different types of physical stratums can be calculated automatically and hierarchically to determine the dredging volume. Practical application shows that the DSM method is more precise and faster compared to the section method, and that the implementation of the developed software provides an interactive graphical user interface and visual presentation.展开更多
An automatic generation method of geological cross-sections in dredging engineering based on 3D geological solid models is presented.The 3D geological models are built applying the non-uniform rational B-splines(NURBS...An automatic generation method of geological cross-sections in dredging engineering based on 3D geological solid models is presented.The 3D geological models are built applying the non-uniform rational B-splines(NURBS) technique,and a 2D profile can be calculated and generated automatically through Boolean operation to meet the demands of dredging projects.Moreover,an automatic marking method for geological attributes is put forward based on database technology,and the geological attributes include the profile name,scale,horizontal and vertical relative coordinates,geological lithology,and 2D standard lithology legend.At the same time,the automatic marking method can also provide an interactive mode for geological engineers to edit and modify the profile in the modeling system.Practical engineering applications show that the automatic generation method is a simple,flexible,fast and precise visual graphics rendering process that can create 2D standard profiles automatically and efficiently.This method also provides a convenient support tool for geological engineering digital analysis.展开更多
Sand is a crucial resource for society’s development. Among the most exploited sand quarries in the world are the lagoon and wetland sand. Although mechanical sand dredging is the most spread technique, manual and tr...Sand is a crucial resource for society’s development. Among the most exploited sand quarries in the world are the lagoon and wetland sand. Although mechanical sand dredging is the most spread technique, manual and traditional techniques are still widely used in West Africa. The purpose of this paper is twofold: to describe traditional sand dredging (TSD), highlighting the procedure used and the structural organization of this activity, and to evaluate the total economic value of TSD in order to help decision making about wetland management. Therefore, TSD occurring in the coastal lagoon complex of Grand Nokoué (CLCGN) in Benin was investigated. Field surveys indicate that TSD is mainly dominated by men, about 93% of the actors. It required intense physical efforts including diving to the bottom of the lake and removing manually the sand in backed toward the surface of the water. TSD actors are organized in local associations which deliver extraction license and discuss with both the others actors and the local government. The total economic value of the benefits of TSD to the population, estimated using direct market value and replacement cost, was estimated at 2.44 million USD per year for 127,818 m3 of sand extracted. It is clear that introduction of mechanical sand dredging will increase the amount the sand removed and subsequently will increase some benefits such as reduction of flooding amplitude and mitigation of the filling of the lakes. However, mechanical sand removal will also considerably reduce the profit the local population makes from sand commercialization which currently represents 80% the total economic value of TSD.展开更多
BACKGROUND Pipeline dredging agents are new household deep cleaning products used to dredge blockages in kitchen and bathroom pipeline caused by grease,hair,vegetable residue,paper cotton fibre,and other organic subst...BACKGROUND Pipeline dredging agents are new household deep cleaning products used to dredge blockages in kitchen and bathroom pipeline caused by grease,hair,vegetable residue,paper cotton fibre,and other organic substances.Pipeline dredging agents are corrosive chemicals that can cause poisoning through corrosive damage to the digestive tract;however,this has not been reported clinically.Therefore,this report emphasises that oral pipeline dredging agent poisoning can cause corrosive damage to the digestive tract and may have serious health consequences.CASE SUMMARY A 68-year-old man consumed liquor(200 m L) at approximately 13:00 on April 22,2021.At approximately 16:00,his family found him unresponsive with blackened lips,blood spots in the corners of the mouth,and blood stains on the ground,as well as an empty bottle of a pipeline dredging agent.One hour later,he was admitted to the emergency department of a local hospital.Considering the empty bottle,he was suspected to have sustained severe corrosive damage to the digestive tract and was transferred to our department at 23:15 on April 22,2021.He developed dysphagia and intermittent fever and experienced difficulty in opening his mouth throughout his hospital stay.The patient’s condition gradually stabilised.However,he suddenly developed respiratory failure on day 12,and endotracheal intubation and ventilator-assisted ventilation were performed.However,the patient died after 1.5 h despite emergency rescue efforts.CONCLUSION Pipeline dredging agents are highly corrosive and may cause corrosive damage to the digestive tract and asphyxia upon consumption.展开更多
River Tigris divides Baghdad, capital of Iraq, in two parts. The reach of the river within Baghdad is about 60 km long. Many islands and bars are obstructing the flow of the river within Baghdad. To overcome this prob...River Tigris divides Baghdad, capital of Iraq, in two parts. The reach of the river within Baghdad is about 60 km long. Many islands and bars are obstructing the flow of the river within Baghdad. To overcome this problem, dredging operations started along most of Tigris River inside Baghdad City to remove many islands and side bars, which reduced the flooding capacity and the efficiency of water intakes. An examination for the dredging plan under process and two proposed additional plans was performed using the Hydrologic Engineering Centers River Analysis System software (HEC-RAS) for a 50 km long river reach to investigate whether they can recover the designed flooding capacity of the river or just improving it. Calibration and verification processes were implemented in the model using observed water levels at Sarai Baghdad gauging station and along the last 15 km of the river reach. Comparisons of computed water levels were conducted with those of previous studies and historical data. Some improvement of flood capacity was achieved based on the recorded data of the last three decades. Cautions about the water intakes should be considered to maintain their function with the expected drop in water level due to dredging operations.展开更多
[Objective] The research aimed to study key problems of a new environmental dredging based on ecological protection and subsequent ecological restoration. [Method] People paid more attention to sediment pollutant remo...[Objective] The research aimed to study key problems of a new environmental dredging based on ecological protection and subsequent ecological restoration. [Method] People paid more attention to sediment pollutant removal in environmental dredging, without considering coming aquatic eco-restoration work after dredging. Factor affecting aquatic ecosystem existence and growth was screened, and ecological dredging manner was put forward. [Result] On the basis of analyzing dredging objective, effect and influence, started from ecological protection and subsequent ecological restoration, water depth and substrate were screened as priority control factors of the environmental sediment dredging. New manner of combining sediment dredging to reshape underwater terrain was put forward. [Conclusion] The research provided solution for water depth and substrate demands of the subsequent ecological restoration.展开更多
The angina pectoris in coronary heart disease belongs to the category of"chest impediment"in traditional Chinese medicine,and belongs to the syndrome of root deficiency with tip excess.Its main pathogenesis ...The angina pectoris in coronary heart disease belongs to the category of"chest impediment"in traditional Chinese medicine,and belongs to the syndrome of root deficiency with tip excess.Its main pathogenesis is obstruction of the heart collaterals,and treatment mainly adopts dredging collaterals and relieving pain.Based on the treatment principles of dredging collaterals with pungent,aiming at the etiology,pathogenesis and disease characteristics of angina pectoris in coronary heart disease,this article systematically analyzes the Method of Dredging Collaterals with Pungent including the methods of dredging collaterals with pungent moisture,dredging collaterals with pungent warm,dredging collaterals with pungent aroma,and dredging collaterals with insect type drugs,to provide ideas for the treatment of angina pectoris in coronary heart disease.展开更多
Objective:To observe the clinical efficacy of compound of owarming yang,descending turbidity and dredging collaterals in the treatment of diabetic kidney disease with yin-yang deficiency and blood stasis syndrome.Meth...Objective:To observe the clinical efficacy of compound of owarming yang,descending turbidity and dredging collaterals in the treatment of diabetic kidney disease with yin-yang deficiency and blood stasis syndrome.Methods:Seventy-six patients of diabetic kidney disease with yin-yang deficiency and blood stasis syndrome were randomly divided into observation group and control group,thirty-eight cases in each group.The control group was given conventional western medicine treatment,while the observation group took compound of owarming yang,descending turbidity and dredging collaterals orally on the basis of conventional western medicine treatment.The course of treatment covered for one month.Before and after treatment,we observed the scores of traditional Chinese medicine symptoms,indicators of renal function[serum creatinine(Scr),blood urea nitrogen(BUN),microalbuminuria(MALB)],indicators of glucose metabolism[fasting plasma glucose(FPG),2-hour postprandial blood glucose(2hPG),glycosylated hemoglobin(HbAlc)],indicators of hemorheology[plasma viscosity(PV),platelet aggregation rate(PAR),fibrinogen(FIB)],Cystatin-C(Cys-C),C-reactive protein(CRP)in the two groups.Results:After treatment,the clinical effect of the observation group was significantly better than the control group(P<0.05).The scores of traditional Chinese medicine symptoms,indicators of renal function(Scr、BUN、UAER),indicators of glucose metabolism(FPG、2hPG、HbAlc),indicators of hemorheology(PV、PAR、FIB),Cys-C and CRP in the two groups were decreased significantly compared with those before treatment(P<0.05),and the decrease in the observation group was superior to that in the control group(P<0.05).Conclusion:Compound of warming yang,descending turbidity and dredging collaterals has remarkable efficacy in treating of diabetic kidney disease patients with yin-yang deficiency and blood stasis syndrome by alleviating clinical symptoms,glucose metabolism,renal function and microcirculatory disturbance,and the mechanism related to alleviation of microinflammation.展开更多
Jamuna, a major braided river in Bangladesh, has an enormous hydrological impact on the surrounding areas and streams. Erosion and sedimentation in the Jamuna river cause a large flow fluctuation and floods round the ...Jamuna, a major braided river in Bangladesh, has an enormous hydrological impact on the surrounding areas and streams. Erosion and sedimentation in the Jamuna river cause a large flow fluctuation and floods round the year. Bangladesh Water Development Board has initiated a pilot capital dredging project in the Jamuna river in 2011-2012, aiming to guide the flow to reduce the risk of failure of the city area and right guide bundh of the Jamuna Bridge. This study explores the long-term role of dredging on river morphology us-ing erosion-sedimentation numerical modeling approaches. Primary data were employed in numerical models to estimate the erosion-sedimentation and compared outputs with the real-time cross-sectional variation at selected sections along the reach during 2012-2013. The analysis suggested that the rate of sedimentation is higher (60% to 80%), where the dredging alignment crosses through the existing sandbar/char. Moreover, a cross-section com-parison revealed that the channel near Sirajganj Hardpoint shifted towards the left (east) bank, and the channel within the study area developed very fast along the right (west) bank. However, satellite image analysis revealed that the major bankline shifting occurred from 2000 to 2010 and the channel shifting was observed from 2014 to 2018 along the reach, mostly, after the construction of some river training works. The variation of the channel per-sistence (40% - 100%) selected part of the study area in the channel inci-dence map, indicating the rapid dynamic behavior of the river morphology. This study showed a good agreement of measured data and simplified em-pirical relationships to predict the long-term morphodynamic behavior of the braided Jamuna river.展开更多
This paper synthesizes the extent and nature of scientific information about how dredging activities potentially affect habitats and key ecological functions supporting recruitment and sustainability of estuarine and ...This paper synthesizes the extent and nature of scientific information about how dredging activities potentially affect habitats and key ecological functions supporting recruitment and sustainability of estuarine and marine environment. Fourteen samples were collected after dredging （2008） from fixed sampling stations. The impact on community was estimated at species level （Foraminifera, Protozoan, using statistical analysis）. The maximum negative effect on benthic foraminifera was reduction by 60%, for species richness and by 50% for diversity. This data were compared with the data obtained before dredging （2006） in a time services spanning 2 years. Its revealed that reestablishment of directly with in less than 3 months of the end of dredging, although affected foraminifera and of physico-chemical substrate characteristic 2 years later there was a considerable improvement of whole faunal community. Statistical treatment was given to the data sets to know the relation among parameters. Before, this type of activity is undertaken, each case should be studied regarding viability, the environmental medium where it will take place, the best time of year, and the type of dredging to be used. Small-patch dredging operations are proposed when ever possible, since they allow a quick readjustment of the initial sediment structure and benthic foraminifera. These findings will help to underpin improved planning of management strategies for dredging operations in India and other countries.展开更多
基金supported by the National Key Research and Development Program of China(No.2021YFD1700600)the National Natural Science Foundation of China(Nos.42222104 and 41971138)+1 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA23020201)and the Science and Technology Planning Project of NIGLAS(No.NIGLAS2022GS10).
文摘China’s lowland rural rivers are facing severe eutrophication problems due to excessive phosphorus(P)from anthropogenic activities.However,quantifying P dynamics in a lowland rural river is challenging due to its complex interaction with surrounding areas.A P dynamic model(River-P)was specifically designed for lowland rural rivers to address this challenge.This modelwas coupled with the Environmental Fluid Dynamics Code(EFDC)and the Phosphorus Dynamic Model for lowland Polder systems(PDP)to characterize P dynamics under the impact of dredging in a lowland rural river.Based on a two-year(2020-2021)dataset from a representative lowland rural river in the Lake Taihu Basin,China,the coupled model was calibrated and achieved a model performance(R^(2)>0.59,RMSE<0.04 mg/L)for total P(TP)concentrations.Our research in the study river revealed that(1)the time scale for the effectiveness of sediment dredging for P control was~300 days,with an increase in P retention capacity by 74.8 kg/year and a decrease in TP concentrations of 23%after dredging.(2)Dredging significantly reduced P release from sediment by 98%,while increased P resuspension and settling capacities by 16%and 46%,respectively.(3)The sediment-water interface(SWI)plays a critical role in P transfer within the river,as resuspension accounts for 16%of TP imports,and settling accounts for 47%of TP exports.Given the large P retention capacity of lowland rural rivers,drainage ditches and ponds with macrophytes are promising approaches to enhance P retention capacity.Our study provides valuable insights for local environmental departments,allowing a comprehensive understanding of P dynamics in lowland rural rivers.This enable the evaluation of the efficacy of sediment dredging in P control and the implementation of corresponding P control measures.
基金Supported by Natural Science Foundation of China,Taoist Qi Healing the World Project(Project No.:71971359).
文摘This study,based on the theory of shifting essence and changing Qi in Inner Canon of Huangdi,deeply explores the theoretical basis,operation method of Conception Vessel Dredging Therapy and its influence on human health.Through case analysis and the statistical analysis of medical records during the pandemic,it reveals the remarkable effects of this method in regulating the endocrine system,improving metabolism,and relieving physical and mental diseases.It provides a theoretical and practical basis for the application of traditional Chinese medicine anti-aging therapy in the modern health field,and helps to explore new ways to delay aging and improve physical and mental health.
基金Supported by the National Natural Science Foundation of China,No.82174461Capacity Enhancement Program of Xiyuan Hospital,China Academy of Traditional Chinese Medicine,No.XYZX0201-22Science and Technology Innovation Project of China Academy of Traditional Chinese Medicine,No.CI2021A01811.
文摘BACKGROUND There is a lack of integrated Chinese and Western medicine treatment regimens supported by high-level evidence-based medicine in the maintenance therapy phase of metastatic colorectal cancer(mCRC).Based on the traditional Chinese medicine theory of“Yin tumor”,we believe that“Yang does not transform Yin,and it is blocked in the intestines”is the core pathogenesis of mCRC.Based on the basic treatment principle of“warming Yang and dredging intestines”,we developed the Quxie Capsule.Previous randomized controlled clinical trials demonstrated that the Quxie Capsule can significantly prolong the overall survival of patients with mCRC,but it remains to be verified whether the combination of the“warming Yang and dredging intestines method”prescription with Western medicine standard regimen can prolong the efficacy and safety of the mCRC during the period of maintenance therapy.AIM To confirm and clinically validate that the combination of“warming Yang and dredging intestines method”prescription with Western medicine standard regimen can prolong progression-free survival(PFS)during maintenance treatment of mCRC.The safety of“warming Yang and dredging intestines method”prescription is also assessed.METHODS The study has a prospective,open-label,randomized,controlled study design.Patients have been recruited beginning November 2023 from Xiyuan Hospital of China Academy of Chinese Medical Sciences,Guang’anmen Hospital of China Academy of Chinese Medical Sciences,Dongfang Hospital of Beijing University of Chinese Medicine,and Xinjiang Uygur Autonomous Region Hospital of Traditional Chinese Medicine.The study period is from March 2024 to March 2026.After screening in outpatient clinics or wards,subjects who met the inclusion criteria are randomized into the treatment or control group in a 2:1 ratio.The treatment group receives the“warming Yang and dredging intestines method”formula combined with Western standard maintenance therapy.The control group receives Western standard maintenance therapy formulated by the investigators based on the Chinese Society of Clinical Oncology guidelines for colorectal cancer.All participants receive treatment until the occurrence of disease progression,death,or unmanageable adverse effects,with post-treatment monitoring continued until mortality.An independent panel of chief physicians with extensive clinical experience evaluates the progression of the disease.RESULTS This study aims to clarify whether the combination of warming Yang and dredging intestines method formula with standard Western medicine regimens can prolong PFS during maintenance therapy for mCRC and whether the treatment has a favorable safety profile.The goal is to provide a combined Chinese and Western medicine treatment option for clinical physicians and mCRC patients.Notably,with the actual sample size,this study has an 80%probability of detecting a significant difference if a true difference exists.Small sample sizes may lead to increased instability of the results of subgroup analyses,and may also result in findings that are only applicable to patients with characteristics highly similar to those of the present study population(e.g.,specific genotypes,therapeutic backgrounds,etc.),making it difficult to generalize to the broader mCRC population.In the future,it may be possible to expand the sample size based on this study to further validate the efficacy and safety of combining Chinese and Western medicine in the treatment of mCRC.Basic research on the therapeutic combination of warming Yang and dredging intestines method formula and standard Western regimen will be performed in parallel.CONCLUSION This study aims to clarify whether the combination of warming Yang and dredging intestines method formula with standard Western medicine regimens can prolong PFS during maintenance therapy for mCRC and whether the treatment has a favorable safety profile.
文摘With the development of social and economic modernization, China has achieved good results in all aspects, but there are still some deficiencies in the construction of river regulation, dredging and other related projects. Making full use of modern science and technology and giving full play to the advantages of advanced technologies such as sludge solidification can further grasp the basic requirements of river dredging and dredging projects and improve various technical points. Therefore, in the process of actual analysis and research, it is very important to know the specific scheme of sludge treatment and make scientific arrangements for the current work.
基金supported by the National Natural Science Foundation of China (No.40730528,40901253)the Social Development Key Project and Natural Science Foundation of Jiangsu Province (No.BE2009603,BK2009333)the Knowledge Innovation Program of Chinese Academy of Sciences (No.CXNIGLAS200804)
文摘An experiment for studying the effects of sediment dredging on denitrification in sediments was carried out through a one-year incubation of undredged （control） and dredged cores in laboratory. Dredging the upper 30 cm of sediment can significantly affect physico-chemical characteristics of sediments. Less degradation of organic matter in the dredged sediments was found during the experiment. Denitrification rates in the sediments were estimated by the acetylene blockage technique, and ranged from 21.6 to 102.7 nmol N2/（g dry weight （dw）-hr） for the undredged sediment and from 6.9 to 26.9 nmol N2/（g dw-hr） for dredged sediments. The denitrification rates in the undredged sediments were markedly higher （p 〈 0.05） than those in the dredged sediments throughout the incubation, with the exception of February 2006. The importance of various environmental factors on denitrification was assessed, which indicated that denitrification was regulated by temperature. Nitrate was probably the key factor limiting denitrification in both undredged and dredged sediments. Organic carbon played some role in determining the denitrification rates in the dredged sediments, but not in the undredged sediments. Sediment dredging influenced the mineralization of organic matter and denitrification in the sediment; and therefore changed the pattern of inherent cycling of nitrogen.
基金Project supported by the Knowledge Innovation Project of the Chinese Academy of Sciences (No.KZCX3-SW-348)the National Natural Science Foundation of China (Nos.20577053 and 40730528)the National High Technology Research and Development Program (863 Program) of China (No.2005AA60101005).
文摘A laboratory experiment was carried out through a six-month incubation of undredged （control） and dredged cores to study the effect of sediment dredging on phosphorus （P） release from the sediment in the Taihu Lake. During the experiment, dredging the upper 30 cm layer could efficiently reduce the interstitial PO4^3-P concentration and different P forms in the sediment. The P fluxes of the undredged and dredged cores ranged from -5.1 to 3047.6 and -60.7 to 14.4μg·m^-2·d^-1, respectively. The fluxes of the dredged cores were generally lower than those of the control. Differences in the fluxes between the dredged and undredged cores were statistically significant （P 〈 0.05） from March to June 2006. The sediment P in the dredged cores had a lower release potential than that in the control. Dredging can be considered as a useful measure for rehabilitating the aquatic ecosystem after the external P loading in the Talhu Lake catchment was efficiently reduced.
基金supported by the Industry-Academia Cooperation Innovation Fund Project of Jiangsu Province(No.BY2011165)the Innovation Program of the Chinese Academy of Sciences(No.KZCX2-EW-314)+1 种基金the Key Project of"One Three Five"Strategic Developing Plan(No.NIGLAS2012135008)the National Water Pollution Control and Management Technology Major Project(No.2012ZX07103-005,2012ZX07101-010)
文摘Algae-caused black bloom （also known as black water agglomerate） has recently become a critical problem in some Chinese lakes.It has been suggested that the occurrence of algae-caused black bloom was caused by the cooperation of nutrient-rich sediment with dead algae,and sludge dredging was adopted to control black bloom in some lakes of China.In this article,based on the simulation of black bloom using a Y-shape apparatus for modeling natural conditions,both un-dredged and dredged sites in three areas of Taihu Lake,China were studied to estimate the effects of dredging on the prevention and control of black bloom.During the experiment,drained algae were added to all six sites as an additional organic load;subsequently,the dissolved oxygen decreased rapidly,dropping to 0 mg/L at the sediment-water interface.Black bloom did not occur in the dredged sites of Moon Bay and Nan Quan,whereas all three un-dredged sites at Fudu Port,Moon Bay and Nan Quan experienced black bloom.Black bloom also occurred at the dredged site of Fudu Port one day later than at the other sites,and the odor and color were lighter than at the other locations.The color and odor of the black water mainly result from the presence of sulfides such as metal sulfides and hydrogen sulfide,among other chemicals,under reductive conditions.The color and odor of the water,together with the high concentrations of nutrients,were mainly caused by the decomposition of the algae and the presence of nutrient-rich sediment.Overall,the removal of the nutrient-rich sediment by dredging can prevent the occurrence and control the degree of algae-caused black bloom in Taihu Lake.
文摘For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has emerged after a longterm model simulation. Results are compared to the Western Scheldt estuary, which forms the inspiration for this study. Subsequently, different dredge and dump scenarios are modelled, according to a conceptual model, in which ebb- and flood-channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system into a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact of human interventions.
基金Supported by Relationship between Diabetic Nephropathy of Blood Stasis Blocking Collaterals Syndrome and Renin-angiotensin System and the Effect of Stasis Removing and Collaterals Dredging Intervention of National Natural Science Foundation of China(No.81173419)
文摘OBJECTIVE: To investigate the correlativity between the changes of blood measures related to blood stasis blocking collaterals and gene expression levels of angiotensin-converting enzyme(ACE)and ACE2 ofrenal cortex in diabetic rats with stasis blocking collaterals syndrome, as well as the effectof stasis removing and collaterals dredging.METHODS: Male Sprague-Dawley rats were divided randomly into normal control group(C group),high-carbohydrate-fat control group(H group) and streptozotocin(STZ)-injecting group. The diabeticrats were induced from rats in the STZ-injecting groupby high-carbohydrate-fat diet combined with STZ intraperitoneal injection, with sustained high-carbohydrate-fat diet fed afterwards, and were further divided into model group(M group)and Chinese medicine of stasis removing and collaterals dredging group(Z group). Rats in the Z group were fed with stasis-removing-and-collaterals-dredging herbal granule suspension intragastrically daily for 16 weeks, while drinking water of corresponding volume was administrated to the rats in other groups. At the end of the 16 th week after successful establishment of models, the ultrastructures of glomeruli in different groups were detected by a transmission electron microscopy; and blood measures related to blood stasis blocking collaterals, including lipid profile and blood viscosity measures, were tested, as well as the relative gene expressions of ACE and ACE2.RESULTS: Changes in ultrastructures of glomeruli in the M group were characterized by lack of clarity in structure and occasional thickening of glomerular basement membrane and extensive fusion in foot processes. The correlation analysis showed that there were positive correlations between lipid profile, blood viscosity, and the ACE mRNA expression levels in the M group(P<0.05), except for cholesterol. And except for triglyceride, the blood measures were in negative correlation with the ACE2 mRNA expression levels in the M group(P<0.05).Compared with the C and H groups, the lipid profile, plasma viscosity and blood viscosity were significantly higher(P<0.01). All the above-mentioned measures were significantly improved in the Z group rats(P<0.05). ACE mRNA expression was significantly higher in the M group thanin the C group(P<0.05). ACE2 mRNA level was significantly lower in the M group than in the C and H groups(P<0.01)and its levelin the Z group was higher than that in the M group(P<0.01).CONCLUSION: Blood measuresrelated to blood stasis blocking collaterals had positive linear correlations with ACE mRNAexpression and negative linear correlations with ACE2 mRNA expression in the M group. Chinese recipe of stasis removing and collaterals dredging could play a renal protecting role for diabetic rats by reducing lipid profile and blood viscosity, down-regulating ACE mRNA expression and up-regulating ACE2 mRNA expression.
基金The National Key Research and Development Program of China under contract No. 2020YFD0900803the National Natural Science Foundation of China under contract Nos 41976157 and 42076177+1 种基金the Science Technology Department of Zhejiang Province under contract No. 2022C03044the State Key Laboratory of Satellite Ocean Environment Dynamics of the Ministry of Natural Resources of China under contract No. QNHX1807。
文摘Channel dredging in estuaries increases water depth and subsequently impacts sediment dynamics and morphology. The Jiaojiang River Estuary is dredged frequently owing to heavy shipping demands. In this study,the effects of different dredging schemes on siltation were assessed through numerical modeling. The sediment model of the Jiaojiang River Estuary utilized an optimized bottom boundary layer model that considered the bed sediment grain size and fluid mud, and this model was calibrated using field data. Result reveal that channel dredging modifies the flow velocity inside and around the channel by changing the bathymetry;subsequently, this affects the residual current, bed stress, suspended sediment concentration, and sediment fluxes. Increasing the dredging depth and width increases the net sediment fluxes into the channel and dredging depth has a greater influence on the channel siltation thickness. When the dredging depth is 8.4 m or11.4 m, the average siltation thickness of the channel is 0.07 m or 0.15 m per mouth respectively. The parallel movement of the channel has small effects on the siltation volume during the simulation period. The sediment deposits in the channel primarily originates from the tidal flats, through bottom sediment fluxes. Vertical net circulation has a dominant impact on siltation because the difference of horizontal current of each layer on the longitudinal section of the channel increases, which intensifies the lateral sediment transport between the shoal and channel. The influence of vertical frictional dissipation on the lateral circulation at the feature points accounts for more than 50% before dredging, while the non-linear advective term is dominant after dredging. Tidal pumping mainly affects the longitudinal sediment fluxes in the channel. These results can be used for channel management and planning for similar estuaries worldwide.
基金Supported by the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (No. 51021004)National Natural Science Foundation of China(No. 50879056)National Key Technologies R&D Program in the 12th Five-Year Plan of China(No. 2011BAB10B06)
文摘Prediction of channel dredging volume is critical for project cost estimation. However, many proposed approximate methods are not accurate. This paper presents a novel numerical method to accurately calculate the dredg- ing volume using a 3D stratum model (DSM) and a channel surface model. First, the 3D DSM is constructed rapidly yet accurately from non-uniform rational B-splines (NURBS) surfaces through Boolean operation between a physical terrain model and a stratum surfaces model. Then, a parametric channel surface model is built from cross-section data and a channel center line using code implemented in the VC++ programming language. Finally, the volumes of different types of physical stratums can be calculated automatically and hierarchically to determine the dredging volume. Practical application shows that the DSM method is more precise and faster compared to the section method, and that the implementation of the developed software provides an interactive graphical user interface and visual presentation.
基金Supported by the Science Fund for Creative Research Groups of National Natural Science Foundation of China(No.51021004)Tianjin Research Program of Application Foundation and Advanced Technology(No.12JCZDJC29200)National Key Technology R and D Program in the 12th Five-Year Plan of China(No.2011BAB10B06)
文摘An automatic generation method of geological cross-sections in dredging engineering based on 3D geological solid models is presented.The 3D geological models are built applying the non-uniform rational B-splines(NURBS) technique,and a 2D profile can be calculated and generated automatically through Boolean operation to meet the demands of dredging projects.Moreover,an automatic marking method for geological attributes is put forward based on database technology,and the geological attributes include the profile name,scale,horizontal and vertical relative coordinates,geological lithology,and 2D standard lithology legend.At the same time,the automatic marking method can also provide an interactive mode for geological engineers to edit and modify the profile in the modeling system.Practical engineering applications show that the automatic generation method is a simple,flexible,fast and precise visual graphics rendering process that can create 2D standard profiles automatically and efficiently.This method also provides a convenient support tool for geological engineering digital analysis.
文摘Sand is a crucial resource for society’s development. Among the most exploited sand quarries in the world are the lagoon and wetland sand. Although mechanical sand dredging is the most spread technique, manual and traditional techniques are still widely used in West Africa. The purpose of this paper is twofold: to describe traditional sand dredging (TSD), highlighting the procedure used and the structural organization of this activity, and to evaluate the total economic value of TSD in order to help decision making about wetland management. Therefore, TSD occurring in the coastal lagoon complex of Grand Nokoué (CLCGN) in Benin was investigated. Field surveys indicate that TSD is mainly dominated by men, about 93% of the actors. It required intense physical efforts including diving to the bottom of the lake and removing manually the sand in backed toward the surface of the water. TSD actors are organized in local associations which deliver extraction license and discuss with both the others actors and the local government. The total economic value of the benefits of TSD to the population, estimated using direct market value and replacement cost, was estimated at 2.44 million USD per year for 127,818 m3 of sand extracted. It is clear that introduction of mechanical sand dredging will increase the amount the sand removed and subsequently will increase some benefits such as reduction of flooding amplitude and mitigation of the filling of the lakes. However, mechanical sand removal will also considerably reduce the profit the local population makes from sand commercialization which currently represents 80% the total economic value of TSD.
文摘BACKGROUND Pipeline dredging agents are new household deep cleaning products used to dredge blockages in kitchen and bathroom pipeline caused by grease,hair,vegetable residue,paper cotton fibre,and other organic substances.Pipeline dredging agents are corrosive chemicals that can cause poisoning through corrosive damage to the digestive tract;however,this has not been reported clinically.Therefore,this report emphasises that oral pipeline dredging agent poisoning can cause corrosive damage to the digestive tract and may have serious health consequences.CASE SUMMARY A 68-year-old man consumed liquor(200 m L) at approximately 13:00 on April 22,2021.At approximately 16:00,his family found him unresponsive with blackened lips,blood spots in the corners of the mouth,and blood stains on the ground,as well as an empty bottle of a pipeline dredging agent.One hour later,he was admitted to the emergency department of a local hospital.Considering the empty bottle,he was suspected to have sustained severe corrosive damage to the digestive tract and was transferred to our department at 23:15 on April 22,2021.He developed dysphagia and intermittent fever and experienced difficulty in opening his mouth throughout his hospital stay.The patient’s condition gradually stabilised.However,he suddenly developed respiratory failure on day 12,and endotracheal intubation and ventilator-assisted ventilation were performed.However,the patient died after 1.5 h despite emergency rescue efforts.CONCLUSION Pipeline dredging agents are highly corrosive and may cause corrosive damage to the digestive tract and asphyxia upon consumption.
文摘River Tigris divides Baghdad, capital of Iraq, in two parts. The reach of the river within Baghdad is about 60 km long. Many islands and bars are obstructing the flow of the river within Baghdad. To overcome this problem, dredging operations started along most of Tigris River inside Baghdad City to remove many islands and side bars, which reduced the flooding capacity and the efficiency of water intakes. An examination for the dredging plan under process and two proposed additional plans was performed using the Hydrologic Engineering Centers River Analysis System software (HEC-RAS) for a 50 km long river reach to investigate whether they can recover the designed flooding capacity of the river or just improving it. Calibration and verification processes were implemented in the model using observed water levels at Sarai Baghdad gauging station and along the last 15 km of the river reach. Comparisons of computed water levels were conducted with those of previous studies and historical data. Some improvement of flood capacity was achieved based on the recorded data of the last three decades. Cautions about the water intakes should be considered to maintain their function with the expected drop in water level due to dredging operations.
基金Supported by Key Special Item of the National Science and TechnologyWater Body Pollution Control and Treatment(2008ZX07421-001)
文摘[Objective] The research aimed to study key problems of a new environmental dredging based on ecological protection and subsequent ecological restoration. [Method] People paid more attention to sediment pollutant removal in environmental dredging, without considering coming aquatic eco-restoration work after dredging. Factor affecting aquatic ecosystem existence and growth was screened, and ecological dredging manner was put forward. [Result] On the basis of analyzing dredging objective, effect and influence, started from ecological protection and subsequent ecological restoration, water depth and substrate were screened as priority control factors of the environmental sediment dredging. New manner of combining sediment dredging to reshape underwater terrain was put forward. [Conclusion] The research provided solution for water depth and substrate demands of the subsequent ecological restoration.
基金Supported by the Youth Science Fund Project of the National Natural Science Foundation of China(30304117474)Scientific Research Project of Shanghai Municipal Health Commission(202040308)。
文摘The angina pectoris in coronary heart disease belongs to the category of"chest impediment"in traditional Chinese medicine,and belongs to the syndrome of root deficiency with tip excess.Its main pathogenesis is obstruction of the heart collaterals,and treatment mainly adopts dredging collaterals and relieving pain.Based on the treatment principles of dredging collaterals with pungent,aiming at the etiology,pathogenesis and disease characteristics of angina pectoris in coronary heart disease,this article systematically analyzes the Method of Dredging Collaterals with Pungent including the methods of dredging collaterals with pungent moisture,dredging collaterals with pungent warm,dredging collaterals with pungent aroma,and dredging collaterals with insect type drugs,to provide ideas for the treatment of angina pectoris in coronary heart disease.
基金Key R&D Project of Liaoning Provincial Science and Technology Department(No.2018225042)
文摘Objective:To observe the clinical efficacy of compound of owarming yang,descending turbidity and dredging collaterals in the treatment of diabetic kidney disease with yin-yang deficiency and blood stasis syndrome.Methods:Seventy-six patients of diabetic kidney disease with yin-yang deficiency and blood stasis syndrome were randomly divided into observation group and control group,thirty-eight cases in each group.The control group was given conventional western medicine treatment,while the observation group took compound of owarming yang,descending turbidity and dredging collaterals orally on the basis of conventional western medicine treatment.The course of treatment covered for one month.Before and after treatment,we observed the scores of traditional Chinese medicine symptoms,indicators of renal function[serum creatinine(Scr),blood urea nitrogen(BUN),microalbuminuria(MALB)],indicators of glucose metabolism[fasting plasma glucose(FPG),2-hour postprandial blood glucose(2hPG),glycosylated hemoglobin(HbAlc)],indicators of hemorheology[plasma viscosity(PV),platelet aggregation rate(PAR),fibrinogen(FIB)],Cystatin-C(Cys-C),C-reactive protein(CRP)in the two groups.Results:After treatment,the clinical effect of the observation group was significantly better than the control group(P<0.05).The scores of traditional Chinese medicine symptoms,indicators of renal function(Scr、BUN、UAER),indicators of glucose metabolism(FPG、2hPG、HbAlc),indicators of hemorheology(PV、PAR、FIB),Cys-C and CRP in the two groups were decreased significantly compared with those before treatment(P<0.05),and the decrease in the observation group was superior to that in the control group(P<0.05).Conclusion:Compound of warming yang,descending turbidity and dredging collaterals has remarkable efficacy in treating of diabetic kidney disease patients with yin-yang deficiency and blood stasis syndrome by alleviating clinical symptoms,glucose metabolism,renal function and microcirculatory disturbance,and the mechanism related to alleviation of microinflammation.
文摘Jamuna, a major braided river in Bangladesh, has an enormous hydrological impact on the surrounding areas and streams. Erosion and sedimentation in the Jamuna river cause a large flow fluctuation and floods round the year. Bangladesh Water Development Board has initiated a pilot capital dredging project in the Jamuna river in 2011-2012, aiming to guide the flow to reduce the risk of failure of the city area and right guide bundh of the Jamuna Bridge. This study explores the long-term role of dredging on river morphology us-ing erosion-sedimentation numerical modeling approaches. Primary data were employed in numerical models to estimate the erosion-sedimentation and compared outputs with the real-time cross-sectional variation at selected sections along the reach during 2012-2013. The analysis suggested that the rate of sedimentation is higher (60% to 80%), where the dredging alignment crosses through the existing sandbar/char. Moreover, a cross-section com-parison revealed that the channel near Sirajganj Hardpoint shifted towards the left (east) bank, and the channel within the study area developed very fast along the right (west) bank. However, satellite image analysis revealed that the major bankline shifting occurred from 2000 to 2010 and the channel shifting was observed from 2014 to 2018 along the reach, mostly, after the construction of some river training works. The variation of the channel per-sistence (40% - 100%) selected part of the study area in the channel inci-dence map, indicating the rapid dynamic behavior of the river morphology. This study showed a good agreement of measured data and simplified em-pirical relationships to predict the long-term morphodynamic behavior of the braided Jamuna river.
文摘This paper synthesizes the extent and nature of scientific information about how dredging activities potentially affect habitats and key ecological functions supporting recruitment and sustainability of estuarine and marine environment. Fourteen samples were collected after dredging （2008） from fixed sampling stations. The impact on community was estimated at species level （Foraminifera, Protozoan, using statistical analysis）. The maximum negative effect on benthic foraminifera was reduction by 60%, for species richness and by 50% for diversity. This data were compared with the data obtained before dredging （2006） in a time services spanning 2 years. Its revealed that reestablishment of directly with in less than 3 months of the end of dredging, although affected foraminifera and of physico-chemical substrate characteristic 2 years later there was a considerable improvement of whole faunal community. Statistical treatment was given to the data sets to know the relation among parameters. Before, this type of activity is undertaken, each case should be studied regarding viability, the environmental medium where it will take place, the best time of year, and the type of dredging to be used. Small-patch dredging operations are proposed when ever possible, since they allow a quick readjustment of the initial sediment structure and benthic foraminifera. These findings will help to underpin improved planning of management strategies for dredging operations in India and other countries.
