[Objectives]This study was conducted to investigate water pollution in the Huanghou Underground River Basin.[Methods]Five representative water quality indicators,ammonia nitrogen(NH+4-N),nitrate nitrogen(NO_(3)^(-)-N)...[Objectives]This study was conducted to investigate water pollution in the Huanghou Underground River Basin.[Methods]Five representative water quality indicators,ammonia nitrogen(NH+4-N),nitrate nitrogen(NO_(3)^(-)-N),permanganate index(COD Mn),total phosphorus(TP),and nitrite nitrogen(NO_(2)^(-)-N),were selected.The single-factor pollution index(P i),Nemerow pollution index(P N),and water quality index(WQI)were calculated to quantitatively assess pollution characteristics and evaluate water quality in the basin.[Results]The overall water quality in the Huanghou Underground River Basin fell within the"slightly polluted to good"range,with pollution primarily concentrated in the upstream areas.The downstream water quality was generally better,as most pollutants from the upstream were diluted or degraded during migration,resulting in little impact on the downstream areas.[Conclusions]This study provides a theoretical basis for understanding the pollution characteristics and evaluation of water quality in the Huanghou Underground River Basin.展开更多
Investigation of groundwater pollution has been carried out on multiple typical karst underground river systems in recent years in order to reveal the characteristics and mechanism of underground river pollution. Thro...Investigation of groundwater pollution has been carried out on multiple typical karst underground river systems in recent years in order to reveal the characteristics and mechanism of underground river pollution. Through the summary of the survey results, five characteristics of underground river pollution have been revealed, including directionality, weak hysteresis, easier for reversibility, linear and intermittent(or seasonal); combining with karst geomorphic types, pollution sources(primordial, secondary pollution and compound), pollution ways and pollution receptors, three basic pollution patterns of the underground river were depicted: Recharge area pollution, runoff area pollution and discharge area pollution. At the same time, the study discloses the reality of the underground river pollution is the three basic patterns and their subgenera in combination with super imposition on the space and time. And from the angle of the hydrogeological model, the study expounds the process of underground river pollution. Finally, the study gives naming rules of pollution pattern of the underground river and sets up PISAB method of pattern recognition. The results provide scientific basis for pollution repair and management of underground river in the southwest karst region.展开更多
The concentrations of organochlorine pesticides(OCPs) in the Laolongdong underground river basin in northern China were quantitatively analyzed using the gas chromatography-mass spectrometer(GC-MS).This study was to i...The concentrations of organochlorine pesticides(OCPs) in the Laolongdong underground river basin in northern China were quantitatively analyzed using the gas chromatography-mass spectrometer(GC-MS).This study was to investigate the composition,distribution and source of OCPs in the waters.The concentrations of ∑OCPs ranged from 14.45 ng· L-1 to 307.92 ng· L-1 and the mean value is 79.42 ng· L-1.β-HCH and p,p '-DDT were the most abundant components in ∑HCHs and ∑DDTs,respectively.There are some differences among the temporal and spatial distributions of ∑OCPs in underground river basin,and the distributions of ∑HCHs and ∑DDTs were same with ∑OCPs.The sources of OCPs analysis indicated that HCHs mainly came from the input of lindane and DDTs was from the mixture input of newly technical DDTs and dicofol.展开更多
Abstract Karst areas have much higher ecological vulnerability and are easy to be contaminated by polychlorinated biphenyls(PCBs) which are introduced as health risk pollutants.PCBs concentrations were used to underst...Abstract Karst areas have much higher ecological vulnerability and are easy to be contaminated by polychlorinated biphenyls(PCBs) which are introduced as health risk pollutants.PCBs concentrations were used to understand the transport behavior of PCBs conducted in the karst Nanshan Underground River,China.Water and sediments from the underground river water,and sediments and soil from the surface of the corresponding watershed were collected monthly in 2011 and 2012 and PCBs were analyzed.Seasonal variations were found in concentrations of PCBs both in the waters and sediments.PCBs concentrations varied from 0.3 to 29.9 ng·L-1 in the groundwater,while from 0.1 to 366.1 ng·g-1 in the underground sediments.Correlations were found in concentrations of PCBs in waters and sediments between the underground river and surface systems which indicate that the surface systems play a major role for the transport of PCBs and contamination in the underground river systems.Karst features are liable for the transport behavior.The underground river waters transport PCBs at mean 3 g·day-1.展开更多
19 kinds of organochlorine pesticides(OCPs) in groundwater surface sediments of Chongqing typical karst areas were analyzed by GC-ECD.The total concentration range of OCPs was 4.73-286.03 ng/g,the concentration range ...19 kinds of organochlorine pesticides(OCPs) in groundwater surface sediments of Chongqing typical karst areas were analyzed by GC-ECD.The total concentration range of OCPs was 4.73-286.03 ng/g,the concentration range of DDTs was 0.35-181.78 ng/g and the concentration range of HCHs was nd-23.53 ng/g.As compared with those of other rivers domestic and abroad, the organchlorine pesticides in sediments of Chongqing typical karst areas is in the high level which indicates that the underground river in Chongqing typical karst areas has been highly polluted.The DDE/DDD展开更多
Hydrologic process,turbidity,suspended particles matters(SPM),major cations and TOC concentrations during two storm events in late April 2008 were monitored at Jiangjia Spring which is the outlet of Qingmuguan undergr...Hydrologic process,turbidity,suspended particles matters(SPM),major cations and TOC concentrations during two storm events in late April 2008 were monitored at Jiangjia Spring which is the outlet of Qingmuguan underground river system.Scanning electron microscopy(SEM) and energy disperse spectroscopy(EDS) analyses of SPM were展开更多
Xiangxi River Basin, located in western Hubei Province in central China, is a karst ridge-trough area with an inhomogeneous and complicated distribution of water resources. This paper compares the characteristics of s...Xiangxi River Basin, located in western Hubei Province in central China, is a karst ridge-trough area with an inhomogeneous and complicated distribution of water resources. This paper compares the characteristics of surface and subsurface floods in this karst basin, utilizing a one-parameter Darcian model and the traditional exponential model. The observed hydrographs and inferred water components are strikingly similar for surface and subsurface floods. The Darcian model and the exponential model are based on different views of the flood generation process, with the former fitting the entire hydrograph with a single time constant, and the latter fitting only the recession limb with multiple time constants. Due to the anisotropy and heterogeneity of karst media, a combination of physical and chemical techniques including the use of 3S（remote sensing, geographical information system, global positioning system） method is proposed for an enhanced hydrological investigation to assess and characterize karst water resources in mountainous areas.展开更多
地下水是岩溶区重要的水源,也是存储大气二氧化碳的重要介质,在岩溶区地下河出口筑坝可以有效保证农业灌溉和居民生活用水,但目前对于这种人为干预后水体碳排放通量变化的研究仍然匮乏。为探究岩溶地下河出口筑坝环境下水体碳排放通量...地下水是岩溶区重要的水源,也是存储大气二氧化碳的重要介质,在岩溶区地下河出口筑坝可以有效保证农业灌溉和居民生活用水,但目前对于这种人为干预后水体碳排放通量变化的研究仍然匮乏。为探究岩溶地下河出口筑坝环境下水体碳排放通量的昼夜时空特征及其控制因素,以我国西南武陵山区龙潭岩溶槽谷龙洞塘地下河出口的拦水区-蓄水池-排水渠道连续体为研究对象,于2023年10月14日至15日,对水温、溶解氧、pH、Ca^(2+)和HCO_(3)^(-)进行了1 h/次的昼夜连续监测,同时对δ^(13)C_(DIC)进行了2 h/次的昼夜监测。计算了水文连续体水-气界面CO_(2)交换通量(FCO_(2))和净生态系统生产力(NEP)并进行了对比。结果表明:在昼夜上,FCO_(2)呈现白天低夜晚高的特征,白天FCO_(2)占总FCO_(2)的46.4%~48.8%,夜晚FCO_(2)占总FCO_(2)的51.2%~53.6%,昼夜变幅最大达22.21×10^(-3) g C/(d·m^(2))。FCO_(2)表现出了显著的空间差异,FCO_(2)具体表现为地下河出口拦水区<蓄水溶潭池<排水主渠道,分别为0.61、0.75和0.81 g C/(d·m^(2))。研究发现生物代谢过程和水体流动方式的改变是控制岩溶地下河筑坝水体FCO_(2)昼夜及空间变化的主要因素,其中生物代谢的影响最为显著。NEP的昼夜变化与FCO_(2)相反,空间变化表现为地下河出口拦水区>蓄水溶潭池>排水主渠道,分别为0.34、0.31和0.26 g C/(d·m^(2)),这说明生物代谢的空间差异可能塑造了FCO_(2)沿流程增加的特征。本研究结果表明,地下河出口筑坝工程改变了水力条件,为水生植物的生长提供有利环境,在促进了生物碳泵效应的同时削减了排放至大气的CO_(2)通量。该发现将为未来岩溶区水体碳排放的干预管理提供新思路。展开更多
基金Supported by Guizhou Provincial Key Technology R&D Program(No.2202023QKHZC).
文摘[Objectives]This study was conducted to investigate water pollution in the Huanghou Underground River Basin.[Methods]Five representative water quality indicators,ammonia nitrogen(NH+4-N),nitrate nitrogen(NO_(3)^(-)-N),permanganate index(COD Mn),total phosphorus(TP),and nitrite nitrogen(NO_(2)^(-)-N),were selected.The single-factor pollution index(P i),Nemerow pollution index(P N),and water quality index(WQI)were calculated to quantitatively assess pollution characteristics and evaluate water quality in the basin.[Results]The overall water quality in the Huanghou Underground River Basin fell within the"slightly polluted to good"range,with pollution primarily concentrated in the upstream areas.The downstream water quality was generally better,as most pollutants from the upstream were diluted or degraded during migration,resulting in little impact on the downstream areas.[Conclusions]This study provides a theoretical basis for understanding the pollution characteristics and evaluation of water quality in the Huanghou Underground River Basin.
基金supported by National Special Research and Development Fund Project(2017YFC0406104)Geological Investigation Project of Ministry of Land and Resources (DD20160300 and DD20160302)+1 种基金Guangxi Natural Science Fund Project (2016JJA150091)Special Fund for Charity Industry of Ministry of Environmental Protection (2016A101)
文摘Investigation of groundwater pollution has been carried out on multiple typical karst underground river systems in recent years in order to reveal the characteristics and mechanism of underground river pollution. Through the summary of the survey results, five characteristics of underground river pollution have been revealed, including directionality, weak hysteresis, easier for reversibility, linear and intermittent(or seasonal); combining with karst geomorphic types, pollution sources(primordial, secondary pollution and compound), pollution ways and pollution receptors, three basic pollution patterns of the underground river were depicted: Recharge area pollution, runoff area pollution and discharge area pollution. At the same time, the study discloses the reality of the underground river pollution is the three basic patterns and their subgenera in combination with super imposition on the space and time. And from the angle of the hydrogeological model, the study expounds the process of underground river pollution. Finally, the study gives naming rules of pollution pattern of the underground river and sets up PISAB method of pattern recognition. The results provide scientific basis for pollution repair and management of underground river in the southwest karst region.
文摘The concentrations of organochlorine pesticides(OCPs) in the Laolongdong underground river basin in northern China were quantitatively analyzed using the gas chromatography-mass spectrometer(GC-MS).This study was to investigate the composition,distribution and source of OCPs in the waters.The concentrations of ∑OCPs ranged from 14.45 ng· L-1 to 307.92 ng· L-1 and the mean value is 79.42 ng· L-1.β-HCH and p,p '-DDT were the most abundant components in ∑HCHs and ∑DDTs,respectively.There are some differences among the temporal and spatial distributions of ∑OCPs in underground river basin,and the distributions of ∑HCHs and ∑DDTs were same with ∑OCPs.The sources of OCPs analysis indicated that HCHs mainly came from the input of lindane and DDTs was from the mixture input of newly technical DDTs and dicofol.
基金financially supported by the National Natural Science Foundation of China(Grant No.41172331)the Academician Foundation of Chongqing(CSTC,2010BC7004)Geological survey project of Ministry of Land and Resources of China(1212011087119)
文摘Abstract Karst areas have much higher ecological vulnerability and are easy to be contaminated by polychlorinated biphenyls(PCBs) which are introduced as health risk pollutants.PCBs concentrations were used to understand the transport behavior of PCBs conducted in the karst Nanshan Underground River,China.Water and sediments from the underground river water,and sediments and soil from the surface of the corresponding watershed were collected monthly in 2011 and 2012 and PCBs were analyzed.Seasonal variations were found in concentrations of PCBs both in the waters and sediments.PCBs concentrations varied from 0.3 to 29.9 ng·L-1 in the groundwater,while from 0.1 to 366.1 ng·g-1 in the underground sediments.Correlations were found in concentrations of PCBs in waters and sediments between the underground river and surface systems which indicate that the surface systems play a major role for the transport of PCBs and contamination in the underground river systems.Karst features are liable for the transport behavior.The underground river waters transport PCBs at mean 3 g·day-1.
文摘19 kinds of organochlorine pesticides(OCPs) in groundwater surface sediments of Chongqing typical karst areas were analyzed by GC-ECD.The total concentration range of OCPs was 4.73-286.03 ng/g,the concentration range of DDTs was 0.35-181.78 ng/g and the concentration range of HCHs was nd-23.53 ng/g.As compared with those of other rivers domestic and abroad, the organchlorine pesticides in sediments of Chongqing typical karst areas is in the high level which indicates that the underground river in Chongqing typical karst areas has been highly polluted.The DDE/DDD
文摘Hydrologic process,turbidity,suspended particles matters(SPM),major cations and TOC concentrations during two storm events in late April 2008 were monitored at Jiangjia Spring which is the outlet of Qingmuguan underground river system.Scanning electron microscopy(SEM) and energy disperse spectroscopy(EDS) analyses of SPM were
基金supported by the China Geological Survey (No. 12120113103800)
文摘Xiangxi River Basin, located in western Hubei Province in central China, is a karst ridge-trough area with an inhomogeneous and complicated distribution of water resources. This paper compares the characteristics of surface and subsurface floods in this karst basin, utilizing a one-parameter Darcian model and the traditional exponential model. The observed hydrographs and inferred water components are strikingly similar for surface and subsurface floods. The Darcian model and the exponential model are based on different views of the flood generation process, with the former fitting the entire hydrograph with a single time constant, and the latter fitting only the recession limb with multiple time constants. Due to the anisotropy and heterogeneity of karst media, a combination of physical and chemical techniques including the use of 3S（remote sensing, geographical information system, global positioning system） method is proposed for an enhanced hydrological investigation to assess and characterize karst water resources in mountainous areas.
文摘地下水是岩溶区重要的水源,也是存储大气二氧化碳的重要介质,在岩溶区地下河出口筑坝可以有效保证农业灌溉和居民生活用水,但目前对于这种人为干预后水体碳排放通量变化的研究仍然匮乏。为探究岩溶地下河出口筑坝环境下水体碳排放通量的昼夜时空特征及其控制因素,以我国西南武陵山区龙潭岩溶槽谷龙洞塘地下河出口的拦水区-蓄水池-排水渠道连续体为研究对象,于2023年10月14日至15日,对水温、溶解氧、pH、Ca^(2+)和HCO_(3)^(-)进行了1 h/次的昼夜连续监测,同时对δ^(13)C_(DIC)进行了2 h/次的昼夜监测。计算了水文连续体水-气界面CO_(2)交换通量(FCO_(2))和净生态系统生产力(NEP)并进行了对比。结果表明:在昼夜上,FCO_(2)呈现白天低夜晚高的特征,白天FCO_(2)占总FCO_(2)的46.4%~48.8%,夜晚FCO_(2)占总FCO_(2)的51.2%~53.6%,昼夜变幅最大达22.21×10^(-3) g C/(d·m^(2))。FCO_(2)表现出了显著的空间差异,FCO_(2)具体表现为地下河出口拦水区<蓄水溶潭池<排水主渠道,分别为0.61、0.75和0.81 g C/(d·m^(2))。研究发现生物代谢过程和水体流动方式的改变是控制岩溶地下河筑坝水体FCO_(2)昼夜及空间变化的主要因素,其中生物代谢的影响最为显著。NEP的昼夜变化与FCO_(2)相反,空间变化表现为地下河出口拦水区>蓄水溶潭池>排水主渠道,分别为0.34、0.31和0.26 g C/(d·m^(2)),这说明生物代谢的空间差异可能塑造了FCO_(2)沿流程增加的特征。本研究结果表明,地下河出口筑坝工程改变了水力条件,为水生植物的生长提供有利环境,在促进了生物碳泵效应的同时削减了排放至大气的CO_(2)通量。该发现将为未来岩溶区水体碳排放的干预管理提供新思路。
