The area of well rice in the sanjiang Plain is incresing recently.At the same time,the groundwater resource has been wasted.Thus,the resource of groundwater is shortening.More and more area appears the phenomenon of ...The area of well rice in the sanjiang Plain is incresing recently.At the same time,the groundwater resource has been wasted.Thus,the resource of groundwater is shortening.More and more area appears the phenomenon of “hanger pump” and “funnel”.According to these problems the paper adopts Chuang Ye farm as the research base,through handle the data of groundwater,applying GM(1,1) to forecasting the dynamic variation of groundwater.The writer hopes to provide some references about using groundwater resource of the area in the future for readers.展开更多
The research of groundwater vulnerability is the basic work to protect the groundwater. For utilizing groundwater resource continuably, groundwater vulnerability evaluation is necessary. Useful reference to protect, e...The research of groundwater vulnerability is the basic work to protect the groundwater. For utilizing groundwater resource continuably, groundwater vulnerability evaluation is necessary. Useful reference to protect, exploit and utilize on groundwater resource are provided rationally. According to the real condition of Sanjiang Plain, the indexes system is established based on the traditional DRASTIC model. The new system includes the following seven indexes： Depth of Water, Net Recharge, Aquifer Media, Soil Media, Conductivity of the Aquifer, Land Utilizing Ratio and Populace Density. The related analysis appears that the system is rather reasonable. Because traditional methods, such as analytic hierarchy process and fuzzy mathematics theory, can＇t be avoided human interference in selection of weights, they could lead to an imprecise result. In order to evaluate the groundwater vulnerability reasonably, entropy weight coefficient method is applied for the first time, which provides a new way to groundwater vulnerability evaluation. The method is a model whose weights are insured by the calculation process, so the artificial disturb can be avoided. It has been used to evaluate the groundwater vulnerability in Sanjiang Plain. The satisfied result is acquired. Comparably, the same result is acquired by the other method named projection pursuit evaluation based on real-coded accelerating genetic algorithm. It shows that entropy weight coefficient method is applicable on groundwater vulnerability evaluation. The evaluation result can provide reference on the decision-making departments.展开更多
Rare earth element （REE） concentrations were measured by ICP-MS for groundwater collected from deep seated Taiyuan Fm limestone aquifer （from -400 to -530 m） in Renlou Coal Mine, northern Anhui Province, China. It...Rare earth element （REE） concentrations were measured by ICP-MS for groundwater collected from deep seated Taiyuan Fm limestone aquifer （from -400 to -530 m） in Renlou Coal Mine, northern Anhui Province, China. It can be concluded that the groundwater is warm （34.0-37.2 ℃） C1-Ca, Na type water with circum-neutral pH （7.35-8.28） and high total dissolved solids （TDS, 1 746-2 849 mg/L）. The groundwater exhibits heavy REEs enrichment relative to light REEs compared with Post Archean Average Shale （PAAS）, as well as their aquifer rocks （limestone）. The enrichment of REEs is considered to be controlled by terrigeneous materials （e.g. zircon） in aquifer rocks, whereas the fractionation of REEs is controlled by marine derived materials （e.g. calcite）, to a less extent, terrigeneous materials and inorganic complexation. The Ce anomalies normalized to PAAS and aquifer rocks are weak, which probably reflects the signature of the aquifer rock rather than redox conditions or pH. The similarities of REE patterns between groundwater and aquifer rocks imply that aquifer rocks play important roles in controlling the REE characteristics of groundwater, and then provide a probability for discrimination of groundwater sources by using REEs.展开更多
PCG2 （Preconditioned Conjugate-Gradient Method 2）, the most popular mothod used in groundwater field, was used to solve the distributed model of large-scale groundwater system. Its principle and effect was analyzed ...PCG2 （Preconditioned Conjugate-Gradient Method 2）, the most popular mothod used in groundwater field, was used to solve the distributed model of large-scale groundwater system. Its principle and effect was analyzed mathematically, and verified by some specific examples. Numerical results acquired by PCG2 are accurate, it demonstrates that PCG2 is effective on methodology itself and man-ralated operation. So PCG2 is worthy of popularizing in the area of groundwater system for numerical analysis.展开更多
The variation characteristics of aquifer parameters,induced by groundwater source heat pump(GWSHP) operation under variable flow,were theoretically analyzed through a case study,in which the characteristics of buildin...The variation characteristics of aquifer parameters,induced by groundwater source heat pump(GWSHP) operation under variable flow,were theoretically analyzed through a case study,in which the characteristics of building air conditioning load were considered.The results,compared with the constant flow operation,indicate that the influence on the variations of porosity,hydraulic conductivity and confined water head is decreased by 48%,51% and 71%,respectively,under variable flow operation.The security of variable flow operation is superior to that of constant flow.It is also concluded that the climate region and function of the buildings are primary factors which affect the suitability of variable flow operation in GWSHP.展开更多
The quality changes of shallow groundwater from karst hilly areas in Guiyang region of China impacted by the urbanization were investigated. The results show that the major ions in shallow groundwater from the karst h...The quality changes of shallow groundwater from karst hilly areas in Guiyang region of China impacted by the urbanization were investigated. The results show that the major ions in shallow groundwater from the karst hilly areas are mainly composed of HCO3^-, SO4^2-, Ca^2＋ and Mg^2＋, and the concentrations scopes of NO3^-, Cl^-, K^＋ and Na^＋ of the groundwater in agricultural, residential and industrial areas are 4.5-9.6, 2.8-7.1, 3.9-6.3 and 2.5-4.9 times higher than those in the forest areas, respectively. The concentrations of As, Pb and Cd of shallow groundwater in the industrial areas are also significantly enhanced, followed by those in the residential areas and the agricultural areas. The concentrations of NO3^-, SO4^2- , As, Pb and Cd of the groundwater in the industrial areas and those of NO3^- , SO4^2-, As and Cd of shallow groundwater in the residential areas reach grade Ⅲ of the Groundwater Quality Standard of China （GB/T 14848-93）, while the concentration of NO3^- in the groundwater from the industrial areas exceeds grade V. With the process of urbanization, NO3^- is the key factor to influence the groundwater quality in karst hilly areas, followed by SO4^2-, As, Pb and Cd.展开更多
Large amount of groundwater discharging from tunnel is likely to cause destruction of the ecological environment in the vicinity of the tunnel, thus an appropriate drainage criterion should be established to balance t...Large amount of groundwater discharging from tunnel is likely to cause destruction of the ecological environment in the vicinity of the tunnel, thus an appropriate drainage criterion should be established to balance the tunnel construction and groundwater.To assess the related problems, an limiting drainage standard ranging from 0.5 to 2.0 m3/(m·d) was suggested for mountain tunnels based on survey and comparative analysis. After that, for the purpose of verifying the rationality of the standard, a calculated formula for dewatering funnel volume caused by drainage was deduced on the basis of the groundwater dynamics and experience method.Furthermore, the equation about the relationship between water discharge and drawdown of groundwater table was presented. The permeability coefficient, specific yield and groundwater table value were introduced, and then combined with the above equation, the drawdown of groundwater table under the proposed limiting drainage criterion was calculated. It is shown that the proposed drainage standard can reach the purpose of protecting ecological environment under the following two conditions. One is the permeability coefficient ranges from 10-4 to 10-5 m/s and the specific yield ranges from 0.1 to 0.001. The other is the permeability coefficient varies from 10-6 to 10-8 m/s and the specific yield varies from 0.1 to 0.01. In addition, a majority of common geotechnical layers are involved in the above ranges. Thus, the proposed limiting drainage standard which ranges from 0.5 to 2.0 m3/(m·d) for mountain tunnel is reasonable.展开更多
Groundwater is an important water resource in Haihe River basin,North China.The number of aquifers that appear to be declining under conditions of groundwater overdraft is increasing.To effectively manage the water re...Groundwater is an important water resource in Haihe River basin,North China.The number of aquifers that appear to be declining under conditions of groundwater overdraft is increasing.To effectively manage the water resources,there is a strong scientific need to analyze the net use of this important water resource and to quantify the water rights allocation for improved understanding of the future water展开更多
Tropical islands,about 50000 in number,are distributed over the Pacific,Indian and Atlantic Oceans.Limited groundwater resources in the form of lens shaped aquifers,in atolls,are extremely vulnerable to natural proces...Tropical islands,about 50000 in number,are distributed over the Pacific,Indian and Atlantic Oceans.Limited groundwater resources in the form of lens shaped aquifers,in atolls,are extremely vulnerable to natural processes and human activities.The increasing population on these islands has worsened the groundwater demand supply ratio significantly. This deteriorating ground water condition has come展开更多
Nitrate pollution in groundwater is a serious water quality problem that increases the risk of developing various cancers.Groundwater is the most important water resource and supports a population of 5 million in Anya...Nitrate pollution in groundwater is a serious water quality problem that increases the risk of developing various cancers.Groundwater is the most important water resource and supports a population of 5 million in Anyang area of the southern part of the North China Plain. Determining the source of nitrate pollution is the challenge in hydrology area due to the complex processes of migration and transformation. A new method is presented to determine the source of nitrogen pollution by combining the composition characteristics of stable carbon isotope in dissolved organic carbon in groundwater. The source of groundwater nitrate is dominated by agricultural fertilizers, as well as manure and wastewater. Mineralization, nitrification and mixing processes occur in the groundwater recharge area, whereas the confined groundwater area is dominated by denitrification processes.展开更多
An intensive monthly sampling of Madhuana drain at three points and hand pumps from four sites over 12 months covering summer and winter seasons at industrial city of Faisalabad was conducted during August 2000 to Jul...An intensive monthly sampling of Madhuana drain at three points and hand pumps from four sites over 12 months covering summer and winter seasons at industrial city of Faisalabad was conducted during August 2000 to July 2001.Water quality parameters (EC,SAR and RSC) and heavy metal(Cd,Cr,Pb,Ni, Cu,Zn and Mn) pollutants were determined.The results showed that samples collected from Madhuana were found unfit for irrigation owing to high EC,SAR and RSC.Among metal ions the concentration of Cu, Ni,Cr and Mn were found above the safty limits proposed by Ayers and Westcot(1985) while that展开更多
Majority of the population of Sri Lanka does not have modern pipe-born water system especially in rural areas.They depend entirely on deep hand pump tube wells and shallow dug wells for their domestic water requiremen...Majority of the population of Sri Lanka does not have modern pipe-born water system especially in rural areas.They depend entirely on deep hand pump tube wells and shallow dug wells for their domestic water requirements.Most of the shallow dug wells in the dry zone of Sri Lanka go dry during the dry period. So construction of tube wells increasing very rapidly in the dry zone of Sri Lanka.Groundwater potential zone maps are the most essential tool for locating tube wells.Arial photographs,Geographical Information Systems(GIS) data and satellite images have展开更多
Study on groundwater and surface water inter-actions is vital to the effective water resources management and aquatic eco-rehabilitation.In this study,measurements of water table and lake stage were conducted in Oigai...Study on groundwater and surface water inter-actions is vital to the effective water resources management and aquatic eco-rehabilitation.In this study,measurements of water table and lake stage were conducted in Oigai Lake to study the interaction between groundwater and lake water.Hydrochemical data was also used as an alternative indicator to study the recharge-discharge functions of Qigai lake and groundwater.The study shows that there are two water-table configurations.In the configuration 1,展开更多
Due to rainwater and surface water infiltration, leachate generated by buried landfill can result in the secondary pollution of groundwater.In this study, combination technologies of chemical coagulation and electroch...Due to rainwater and surface water infiltration, leachate generated by buried landfill can result in the secondary pollution of groundwater.In this study, combination technologies of chemical coagulation and electrochemistry were used to treat landfill leachate.First,experiments were carried out with Ca（OH）<sub>2</sub> and FeCl<sub>3</sub> as the flocculant to pre-treat landfill leachate.The optimum treatment conditions are as follows:the dosages of Ca（OH）<sub>2</sub> and FeCl<sub>3</sub> are 17 g/L and 17 mL/L,respectively;mixing time is 5min,and the 86.8%of COD<sub>Cr</sub>,38.6%of NH<sub>3</sub>-N and 93.2%of phosphorus were removed(COD<sub>Cr</sub>,NH<sub>3</sub>展开更多
Groundwater is a valuable resource in the semiarid Ordos Plateau where abundant natural resources,such as coal,natural gas and halite,are present.With the development of the resources,groundwater demand increases dram...Groundwater is a valuable resource in the semiarid Ordos Plateau where abundant natural resources,such as coal,natural gas and halite,are present.With the development of the resources,groundwater demand increases dramatically.Origin identification and recharge estimates of groundwater are significant parts of the sustainable groundwater development in the Ordos Plateau.Both groundwater and precipitation展开更多
The agricultural production on the irrigated grounds can not carry on without mineral fertilizers,pesticides and herbicides.Especially it is shown in Uzbekistan, in cultivation of cotton.There is an increase in minera...The agricultural production on the irrigated grounds can not carry on without mineral fertilizers,pesticides and herbicides.Especially it is shown in Uzbekistan, in cultivation of cotton.There is an increase in mineralization,rigidity,quantity of heavy metals,phenols and other pollutions in the cotton fields.Thus there is an exhaustion of stocks of fresh underground waters.In the year 2003 we were offered to create展开更多
The pollution of iron,manganese and nitrate in groundwater is a huge threat to human beings.In this study,column experiments of ceramic,manganese sand,ceramic sand,volcanic rock,quartz sand were conducted.Iron and man...The pollution of iron,manganese and nitrate in groundwater is a huge threat to human beings.In this study,column experiments of ceramic,manganese sand,ceramic sand,volcanic rock,quartz sand were conducted.Iron and manganese contents of influent were 3.3 mg/L and 2.1 mg/L.When the biofilm became mature,the highest iron and manganese removal rate achieved by manganese sand as a filter material.Quartz did a little worse than manganese sand,but other three filter material could not reach展开更多
Integrated geological,geochemical and geophysical investigations have been carried out for the groundwater management in Tellapur Urban node, Greater Hyderbad,India.The watershed covering an area of 10 km^2,a part of ...Integrated geological,geochemical and geophysical investigations have been carried out for the groundwater management in Tellapur Urban node, Greater Hyderbad,India.The watershed covering an area of 10 km^2,a part of Nakkavagu catchment in the Manjira River sub-basin,which is a tributary of Godavari River.Electrical Resistivity Tomography and conventional Resistivity investigations have been carried out at different locations for assessment of sub-surface geometry as well as groundwater condi-展开更多
The problem of arsenic(As)poisoning in the upper deltaic plains of the Ganges-Bhagirathi river system of West Bengal(WB),India,is terrifying. Elevated As(】50 ppb)in well water was observed within a depth range of 10-...The problem of arsenic(As)poisoning in the upper deltaic plains of the Ganges-Bhagirathi river system of West Bengal(WB),India,is terrifying. Elevated As(】50 ppb)in well water was observed within a depth range of 10-30 m in older grey terraces of abandoned fluvial channel deposits in the Murshidabad and Malda districts in WB.Both surface and cored(2-20 m)sediment samples from banks of the river Ganges and along a north-south transect of the main tributary Bhagirathi-Hooghly river展开更多
基金China Postdoctoral Science Fund.The Youth Fund of Si Chuon University ( 4 3 2 0 2 8)
文摘The area of well rice in the sanjiang Plain is incresing recently.At the same time,the groundwater resource has been wasted.Thus,the resource of groundwater is shortening.More and more area appears the phenomenon of “hanger pump” and “funnel”.According to these problems the paper adopts Chuang Ye farm as the research base,through handle the data of groundwater,applying GM(1,1) to forecasting the dynamic variation of groundwater.The writer hopes to provide some references about using groundwater resource of the area in the future for readers.
基金Supported by the National Natural Science Foundation of China(30400275)the Tackle Key Problems of Heilongjiang Province(the Hobbledehoy Science Fund of Heilongjiang Province)(QC04C28)
文摘The research of groundwater vulnerability is the basic work to protect the groundwater. For utilizing groundwater resource continuably, groundwater vulnerability evaluation is necessary. Useful reference to protect, exploit and utilize on groundwater resource are provided rationally. According to the real condition of Sanjiang Plain, the indexes system is established based on the traditional DRASTIC model. The new system includes the following seven indexes： Depth of Water, Net Recharge, Aquifer Media, Soil Media, Conductivity of the Aquifer, Land Utilizing Ratio and Populace Density. The related analysis appears that the system is rather reasonable. Because traditional methods, such as analytic hierarchy process and fuzzy mathematics theory, can＇t be avoided human interference in selection of weights, they could lead to an imprecise result. In order to evaluate the groundwater vulnerability reasonably, entropy weight coefficient method is applied for the first time, which provides a new way to groundwater vulnerability evaluation. The method is a model whose weights are insured by the calculation process, so the artificial disturb can be avoided. It has been used to evaluate the groundwater vulnerability in Sanjiang Plain. The satisfied result is acquired. Comparably, the same result is acquired by the other method named projection pursuit evaluation based on real-coded accelerating genetic algorithm. It shows that entropy weight coefficient method is applicable on groundwater vulnerability evaluation. The evaluation result can provide reference on the decision-making departments.
基金Project(40873015) supported by the National Natural Science Foundation of ChinaProject(08010302062) supported by the Eleventh Five-year Scientific and Technological Program of Anhui Province,China
文摘Rare earth element （REE） concentrations were measured by ICP-MS for groundwater collected from deep seated Taiyuan Fm limestone aquifer （from -400 to -530 m） in Renlou Coal Mine, northern Anhui Province, China. It can be concluded that the groundwater is warm （34.0-37.2 ℃） C1-Ca, Na type water with circum-neutral pH （7.35-8.28） and high total dissolved solids （TDS, 1 746-2 849 mg/L）. The groundwater exhibits heavy REEs enrichment relative to light REEs compared with Post Archean Average Shale （PAAS）, as well as their aquifer rocks （limestone）. The enrichment of REEs is considered to be controlled by terrigeneous materials （e.g. zircon） in aquifer rocks, whereas the fractionation of REEs is controlled by marine derived materials （e.g. calcite）, to a less extent, terrigeneous materials and inorganic complexation. The Ce anomalies normalized to PAAS and aquifer rocks are weak, which probably reflects the signature of the aquifer rock rather than redox conditions or pH. The similarities of REE patterns between groundwater and aquifer rocks imply that aquifer rocks play important roles in controlling the REE characteristics of groundwater, and then provide a probability for discrimination of groundwater sources by using REEs.
基金Supported by National Natural Science Foundation (30370825)
文摘PCG2 （Preconditioned Conjugate-Gradient Method 2）, the most popular mothod used in groundwater field, was used to solve the distributed model of large-scale groundwater system. Its principle and effect was analyzed mathematically, and verified by some specific examples. Numerical results acquired by PCG2 are accurate, it demonstrates that PCG2 is effective on methodology itself and man-ralated operation. So PCG2 is worthy of popularizing in the area of groundwater system for numerical analysis.
基金Project(2006BAJ01B05) supported by the National Science and Technology Pillar Program during the 11th Five-Year Plane Period
文摘The variation characteristics of aquifer parameters,induced by groundwater source heat pump(GWSHP) operation under variable flow,were theoretically analyzed through a case study,in which the characteristics of building air conditioning load were considered.The results,compared with the constant flow operation,indicate that the influence on the variations of porosity,hydraulic conductivity and confined water head is decreased by 48%,51% and 71%,respectively,under variable flow operation.The security of variable flow operation is superior to that of constant flow.It is also concluded that the climate region and function of the buildings are primary factors which affect the suitability of variable flow operation in GWSHP.
基金Project(2006CB403205) supported by the National Key Basic Research Program of ChinaProject(40961030) supported by the National Natural Science Foundation of China
文摘The quality changes of shallow groundwater from karst hilly areas in Guiyang region of China impacted by the urbanization were investigated. The results show that the major ions in shallow groundwater from the karst hilly areas are mainly composed of HCO3^-, SO4^2-, Ca^2＋ and Mg^2＋, and the concentrations scopes of NO3^-, Cl^-, K^＋ and Na^＋ of the groundwater in agricultural, residential and industrial areas are 4.5-9.6, 2.8-7.1, 3.9-6.3 and 2.5-4.9 times higher than those in the forest areas, respectively. The concentrations of As, Pb and Cd of shallow groundwater in the industrial areas are also significantly enhanced, followed by those in the residential areas and the agricultural areas. The concentrations of NO3^-, SO4^2- , As, Pb and Cd of the groundwater in the industrial areas and those of NO3^- , SO4^2-, As and Cd of shallow groundwater in the residential areas reach grade Ⅲ of the Groundwater Quality Standard of China （GB/T 14848-93）, while the concentration of NO3^- in the groundwater from the industrial areas exceeds grade V. With the process of urbanization, NO3^- is the key factor to influence the groundwater quality in karst hilly areas, followed by SO4^2-, As, Pb and Cd.
基金Projects(51078359,51208522,51208523)supported by the National Natural Science Foundation of ChinaProject(2010-122-009)supported by the Traffic Science and Technology Fund of Guizhou Province,ChinaProject(CX2011B098)supported by the Postgraduate Research Innovation Fund of Hunan Province,China
文摘Large amount of groundwater discharging from tunnel is likely to cause destruction of the ecological environment in the vicinity of the tunnel, thus an appropriate drainage criterion should be established to balance the tunnel construction and groundwater.To assess the related problems, an limiting drainage standard ranging from 0.5 to 2.0 m3/(m·d) was suggested for mountain tunnels based on survey and comparative analysis. After that, for the purpose of verifying the rationality of the standard, a calculated formula for dewatering funnel volume caused by drainage was deduced on the basis of the groundwater dynamics and experience method.Furthermore, the equation about the relationship between water discharge and drawdown of groundwater table was presented. The permeability coefficient, specific yield and groundwater table value were introduced, and then combined with the above equation, the drawdown of groundwater table under the proposed limiting drainage criterion was calculated. It is shown that the proposed drainage standard can reach the purpose of protecting ecological environment under the following two conditions. One is the permeability coefficient ranges from 10-4 to 10-5 m/s and the specific yield ranges from 0.1 to 0.001. The other is the permeability coefficient varies from 10-6 to 10-8 m/s and the specific yield varies from 0.1 to 0.01. In addition, a majority of common geotechnical layers are involved in the above ranges. Thus, the proposed limiting drainage standard which ranges from 0.5 to 2.0 m3/(m·d) for mountain tunnel is reasonable.
文摘Groundwater is an important water resource in Haihe River basin,North China.The number of aquifers that appear to be declining under conditions of groundwater overdraft is increasing.To effectively manage the water resources,there is a strong scientific need to analyze the net use of this important water resource and to quantify the water rights allocation for improved understanding of the future water
文摘Tropical islands,about 50000 in number,are distributed over the Pacific,Indian and Atlantic Oceans.Limited groundwater resources in the form of lens shaped aquifers,in atolls,are extremely vulnerable to natural processes and human activities.The increasing population on these islands has worsened the groundwater demand supply ratio significantly. This deteriorating ground water condition has come
基金Projects(41072179,41002083)supported by the National Natural Science Foundation of China
文摘Nitrate pollution in groundwater is a serious water quality problem that increases the risk of developing various cancers.Groundwater is the most important water resource and supports a population of 5 million in Anyang area of the southern part of the North China Plain. Determining the source of nitrate pollution is the challenge in hydrology area due to the complex processes of migration and transformation. A new method is presented to determine the source of nitrogen pollution by combining the composition characteristics of stable carbon isotope in dissolved organic carbon in groundwater. The source of groundwater nitrate is dominated by agricultural fertilizers, as well as manure and wastewater. Mineralization, nitrification and mixing processes occur in the groundwater recharge area, whereas the confined groundwater area is dominated by denitrification processes.
文摘An intensive monthly sampling of Madhuana drain at three points and hand pumps from four sites over 12 months covering summer and winter seasons at industrial city of Faisalabad was conducted during August 2000 to July 2001.Water quality parameters (EC,SAR and RSC) and heavy metal(Cd,Cr,Pb,Ni, Cu,Zn and Mn) pollutants were determined.The results showed that samples collected from Madhuana were found unfit for irrigation owing to high EC,SAR and RSC.Among metal ions the concentration of Cu, Ni,Cr and Mn were found above the safty limits proposed by Ayers and Westcot(1985) while that
文摘Majority of the population of Sri Lanka does not have modern pipe-born water system especially in rural areas.They depend entirely on deep hand pump tube wells and shallow dug wells for their domestic water requirements.Most of the shallow dug wells in the dry zone of Sri Lanka go dry during the dry period. So construction of tube wells increasing very rapidly in the dry zone of Sri Lanka.Groundwater potential zone maps are the most essential tool for locating tube wells.Arial photographs,Geographical Information Systems(GIS) data and satellite images have
文摘Study on groundwater and surface water inter-actions is vital to the effective water resources management and aquatic eco-rehabilitation.In this study,measurements of water table and lake stage were conducted in Oigai Lake to study the interaction between groundwater and lake water.Hydrochemical data was also used as an alternative indicator to study the recharge-discharge functions of Qigai lake and groundwater.The study shows that there are two water-table configurations.In the configuration 1,
文摘Due to rainwater and surface water infiltration, leachate generated by buried landfill can result in the secondary pollution of groundwater.In this study, combination technologies of chemical coagulation and electrochemistry were used to treat landfill leachate.First,experiments were carried out with Ca（OH）<sub>2</sub> and FeCl<sub>3</sub> as the flocculant to pre-treat landfill leachate.The optimum treatment conditions are as follows:the dosages of Ca（OH）<sub>2</sub> and FeCl<sub>3</sub> are 17 g/L and 17 mL/L,respectively;mixing time is 5min,and the 86.8%of COD<sub>Cr</sub>,38.6%of NH<sub>3</sub>-N and 93.2%of phosphorus were removed(COD<sub>Cr</sub>,NH<sub>3</sub>
文摘Groundwater is a valuable resource in the semiarid Ordos Plateau where abundant natural resources,such as coal,natural gas and halite,are present.With the development of the resources,groundwater demand increases dramatically.Origin identification and recharge estimates of groundwater are significant parts of the sustainable groundwater development in the Ordos Plateau.Both groundwater and precipitation
文摘The agricultural production on the irrigated grounds can not carry on without mineral fertilizers,pesticides and herbicides.Especially it is shown in Uzbekistan, in cultivation of cotton.There is an increase in mineralization,rigidity,quantity of heavy metals,phenols and other pollutions in the cotton fields.Thus there is an exhaustion of stocks of fresh underground waters.In the year 2003 we were offered to create
文摘The pollution of iron,manganese and nitrate in groundwater is a huge threat to human beings.In this study,column experiments of ceramic,manganese sand,ceramic sand,volcanic rock,quartz sand were conducted.Iron and manganese contents of influent were 3.3 mg/L and 2.1 mg/L.When the biofilm became mature,the highest iron and manganese removal rate achieved by manganese sand as a filter material.Quartz did a little worse than manganese sand,but other three filter material could not reach
文摘Integrated geological,geochemical and geophysical investigations have been carried out for the groundwater management in Tellapur Urban node, Greater Hyderbad,India.The watershed covering an area of 10 km^2,a part of Nakkavagu catchment in the Manjira River sub-basin,which is a tributary of Godavari River.Electrical Resistivity Tomography and conventional Resistivity investigations have been carried out at different locations for assessment of sub-surface geometry as well as groundwater condi-
文摘The problem of arsenic(As)poisoning in the upper deltaic plains of the Ganges-Bhagirathi river system of West Bengal(WB),India,is terrifying. Elevated As(】50 ppb)in well water was observed within a depth range of 10-30 m in older grey terraces of abandoned fluvial channel deposits in the Murshidabad and Malda districts in WB.Both surface and cored(2-20 m)sediment samples from banks of the river Ganges and along a north-south transect of the main tributary Bhagirathi-Hooghly river
