The training effectiveness of the lower Yellow River(LYR)depends on the understanding of the regularity offlow-sediment transport and riverbed sedimentation.The measured data of dailyflow discharge and sediment transpor...The training effectiveness of the lower Yellow River(LYR)depends on the understanding of the regularity offlow-sediment transport and riverbed sedimentation.The measured data of dailyflow discharge and sediment transport rate at thefive hydrological stations(Xiaolangdi[Xld],Huayuankou[Hyk],Gaocun[Gc],Aishan[As],and Lijin[Lj])in the LYR during the period from 1960 to 2017 are used to investigate the regularity offlow-sediment transport and sedimentation in the LYR.The Xld station is used as the inlet control station,and the LYR is divided into four segments using four other stations,and the whole year is divided into three periods,namely,the dry season,theflood period,and the nonflood period of the wet season.On this basis,the relationships between the sediment transport rates at the four stations(Hyk,Gc,As,and Lj)and the rates at their respective closest upstream stations are analyzed in each of the three periods.According to the incoming sediment coefficient of the Xld station,theflow and sediment processes in the three periods are classified,and the refined equations for the relationship between the sediment transport rates at the downstream station and its upstream station are established.The results show that the calculated amount and process of erosion and deposition in each period and each segment of the LYR using the equations are in good agreement with the measured values.The relationship equations established in this study can conveniently predict the amount of erosion and deposition in different periods and different segments of the LYR in the future,which is of great significance to the rapid decision of the impact of the construction and operation of hydraulic projects in the upper and middle reaches of the Yellow River on the sedimentation in the LYR.展开更多
There are many reservoirs in China,and serious reservoir sedimentation affects reservoir function and reservoir safety.It is of great significance for restoring the reservoir capacity,improving the efficiency of the r...There are many reservoirs in China,and serious reservoir sedimentation affects reservoir function and reservoir safety.It is of great significance for restoring the reservoir capacity,improving the efficiency of the reservoir and prolonging the service life of the reservoir to carry out the research on reservoir sedimentation control and storage capacity recovery technology,in the case of fewer and fewer good dam sites suitable for the construction of the reservoir and the increasing accumulation of reservoir sedimentation.In this paper,influence factor of the storage loss,sedimentation control and reservoir capacity recovery technology in China are briefly reviewed.It is necessary to carry out research work on reservoir sedimentation investigation and reservoir siltation mechanism and control measures.展开更多
Three new lignan glucosides, baicalensinosides A-C (1-3), were isolated from the roots of Scutellaria baicalensis. The structural elucidation was achieved by in-depth spectroscopic examinations and qualitative chemica...Three new lignan glucosides, baicalensinosides A-C (1-3), were isolated from the roots of Scutellaria baicalensis. The structural elucidation was achieved by in-depth spectroscopic examinations and qualitative chemical test. Structurally, these compounds belong to the 3,4-dibenzyltetrahydrofuran-type lignan glycoside with a mono-hydroxyl substitution at the 7'-position of benzylidene group on the numbering system of lignans being one of their shared critical features. The anti-osteoporotic activity of the isolated compounds was assessed in an in vitro osteoprotegerin (OPG) transcriptional activity assay using dual luciferase reporter detection. At 10 mu mol/L, compounds 1-3 increased the relative activating ratio of OPG transcription to 1.83, 0.84 and 0.98 times that of the control group, respectively. (C) 2016 Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical Sciences. Production and hosting by Elsevier B.V.展开更多
基金Open Research Fund of state key Laboratory of simulation and Regulation of Water Cycle in River Basin(China lnstitute of Water Resources and Hydropower Research),Grant/Award Number:IWHR-SKL-202104National Natural Science Foundation of China,Grant/Award Number:U2243237Outstanding Youth scientific research project of Yellow River Conservancy Commission of the Ministry of Water Resources,Grant/Award Number:HQK-202302。
文摘The training effectiveness of the lower Yellow River(LYR)depends on the understanding of the regularity offlow-sediment transport and riverbed sedimentation.The measured data of dailyflow discharge and sediment transport rate at thefive hydrological stations(Xiaolangdi[Xld],Huayuankou[Hyk],Gaocun[Gc],Aishan[As],and Lijin[Lj])in the LYR during the period from 1960 to 2017 are used to investigate the regularity offlow-sediment transport and sedimentation in the LYR.The Xld station is used as the inlet control station,and the LYR is divided into four segments using four other stations,and the whole year is divided into three periods,namely,the dry season,theflood period,and the nonflood period of the wet season.On this basis,the relationships between the sediment transport rates at the four stations(Hyk,Gc,As,and Lj)and the rates at their respective closest upstream stations are analyzed in each of the three periods.According to the incoming sediment coefficient of the Xld station,theflow and sediment processes in the three periods are classified,and the refined equations for the relationship between the sediment transport rates at the downstream station and its upstream station are established.The results show that the calculated amount and process of erosion and deposition in each period and each segment of the LYR using the equations are in good agreement with the measured values.The relationship equations established in this study can conveniently predict the amount of erosion and deposition in different periods and different segments of the LYR in the future,which is of great significance to the rapid decision of the impact of the construction and operation of hydraulic projects in the upper and middle reaches of the Yellow River on the sedimentation in the LYR.
基金Supported by National Key R&D Plan(2017YFC0405201,2018YFC0407404)Achievements Transformation Project of China Institute of Water Resources and Hydropower Research(SE10003A012017)
文摘There are many reservoirs in China,and serious reservoir sedimentation affects reservoir function and reservoir safety.It is of great significance for restoring the reservoir capacity,improving the efficiency of the reservoir and prolonging the service life of the reservoir to carry out the research on reservoir sedimentation control and storage capacity recovery technology,in the case of fewer and fewer good dam sites suitable for the construction of the reservoir and the increasing accumulation of reservoir sedimentation.In this paper,influence factor of the storage loss,sedimentation control and reservoir capacity recovery technology in China are briefly reviewed.It is necessary to carry out research work on reservoir sedimentation investigation and reservoir siltation mechanism and control measures.
基金supported by grants from National Natural Science Foundation of China(No.81361138020)
文摘Three new lignan glucosides, baicalensinosides A-C (1-3), were isolated from the roots of Scutellaria baicalensis. The structural elucidation was achieved by in-depth spectroscopic examinations and qualitative chemical test. Structurally, these compounds belong to the 3,4-dibenzyltetrahydrofuran-type lignan glycoside with a mono-hydroxyl substitution at the 7'-position of benzylidene group on the numbering system of lignans being one of their shared critical features. The anti-osteoporotic activity of the isolated compounds was assessed in an in vitro osteoprotegerin (OPG) transcriptional activity assay using dual luciferase reporter detection. At 10 mu mol/L, compounds 1-3 increased the relative activating ratio of OPG transcription to 1.83, 0.84 and 0.98 times that of the control group, respectively. (C) 2016 Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical Sciences. Production and hosting by Elsevier B.V.
