Large-scale water pumping has caused significant decline in groundwater level in the Upper Arkansas corridor region, which in turn has triggered a chain of hydrological and ecological impacts. A newly developed concep...Large-scale water pumping has caused significant decline in groundwater level in the Upper Arkansas corridor region, which in turn has triggered a chain of hydrological and ecological impacts. A newly developed conceptualization groundwater data model was used to organize various datasets on the Upper Arkansas corridor groundwater system and to develop a MODFLOW model to simulate groundwater flow in the region from 1959 to 2005. The simulation results have shown a sig- nificant decline in groundwater level and the conversion of Arkansas River from a gaining river to a losing river in the western two-thirds of the study area. Correlation analysis between percentage of salt cedar and the hydrogeological conditions indicates that these hydrogeological changes at least partially account for invasion of salt cedar that is more drought tolerant. The analysis also illustrates the com- plexity of the interaction mechanisms between hydrological conditions and salt cedar distribution, and suggests the need for better data on salt cedar distribution with higher spatial resolution and across larger hydrological gradients.展开更多
Extensive land use will cause many environmental problems.It is an urgent task to improve land use efficiency and optimize land use patterns.In recent years,due to the flow decrease,the Guanzhong Basin in Shaanxi Prov...Extensive land use will cause many environmental problems.It is an urgent task to improve land use efficiency and optimize land use patterns.In recent years,due to the flow decrease,the Guanzhong Basin in Shaanxi Province is confronted with the problem of insufficient water resources reserve.Based on the Coupled Ground-Water and Surface-Water Flow Model(GSFLOW),this paper evaluates the response of water resources in the basin to changes in land use patterns,optimizes the land use pattern,improves the ecological and economic benefits,and the efficiency of various spatial development,providing a reference for ecological protection and high-quality development of the Yellow River Basin.The research shows that the land use pattern in the Guanzhong Basin should be further optimized.Under the condition of considering ecological and economic development,the percentage change of the optimum area of farmland,forest,grassland,water area,and urban area compared with the current land use area ratio is+2.3,+2.4,-6.1,+0.2,and+1.6,respectively.The economic and ecological value of land increases by14.1%and 3.1%,respectively,and the number of water resources can increase by 2.5%.展开更多
The Platte River watershed,the largest river basin in Nebraska(1.06×105 km^(2)),crosses the entire state along its W-E course in the approximate N-S center of Nebraska.A plethora of historical(1968-1975)hydrochem...The Platte River watershed,the largest river basin in Nebraska(1.06×105 km^(2)),crosses the entire state along its W-E course in the approximate N-S center of Nebraska.A plethora of historical(1968-1975)hydrochemistry data[major cations and anions,primarily]resulting from collection and analysis by the Nebraska Department of Environment and Energy(NDEE)were statistically and graphically analyzed and subjected to geochemical modeling.Interpretation of this large legacy dataset(31 Platte River systems sampling stations and 34 sampling sites on 22 tributaries)revealed several hydrochemical facies(Ca-HCO_(3)and three additional ones,encompassing Ca-SO_(4)and Na-SO_(4)facies solely in South Platte River discharge),and slight calcite and dolomite supersaturation comprising a line of evidence for the near thermodynamic equilibrium of the studied surface waters.Scatter plots of selected cations versus anions reveal the impact of silicate minerals(e.g.,feldspars)weathering on the aqueous hydrochemistry throughout the watershed.Relatively high concentrations of sulfate(up to 1100 mg/L)in numerous samples from the South Platte River are probably sourced by agricultural fertilizer,irrigation water,and dissolution of gypsum/anhydrite.NETPATH geochemical modeling identified 10 plausible models to simulate the significant decrease in SO_(4)levels downstream along the South Platte River.展开更多
基金supported by the Provost Office’s Targeted Excellence Program at Kansas State University,the U.S. National Science Foundation (No. EPS0553722)the United States Department of Agriculture/Agricultural Research Service (Co-operative Agreement 58-6209-3-018)
文摘Large-scale water pumping has caused significant decline in groundwater level in the Upper Arkansas corridor region, which in turn has triggered a chain of hydrological and ecological impacts. A newly developed conceptualization groundwater data model was used to organize various datasets on the Upper Arkansas corridor groundwater system and to develop a MODFLOW model to simulate groundwater flow in the region from 1959 to 2005. The simulation results have shown a sig- nificant decline in groundwater level and the conversion of Arkansas River from a gaining river to a losing river in the western two-thirds of the study area. Correlation analysis between percentage of salt cedar and the hydrogeological conditions indicates that these hydrogeological changes at least partially account for invasion of salt cedar that is more drought tolerant. The analysis also illustrates the com- plexity of the interaction mechanisms between hydrological conditions and salt cedar distribution, and suggests the need for better data on salt cedar distribution with higher spatial resolution and across larger hydrological gradients.
基金jointly supported by the National Natural Science Foundation of China(41702280)the projects of the China Geology Survey(DD20221754 and DD20190333)。
文摘Extensive land use will cause many environmental problems.It is an urgent task to improve land use efficiency and optimize land use patterns.In recent years,due to the flow decrease,the Guanzhong Basin in Shaanxi Province is confronted with the problem of insufficient water resources reserve.Based on the Coupled Ground-Water and Surface-Water Flow Model(GSFLOW),this paper evaluates the response of water resources in the basin to changes in land use patterns,optimizes the land use pattern,improves the ecological and economic benefits,and the efficiency of various spatial development,providing a reference for ecological protection and high-quality development of the Yellow River Basin.The research shows that the land use pattern in the Guanzhong Basin should be further optimized.Under the condition of considering ecological and economic development,the percentage change of the optimum area of farmland,forest,grassland,water area,and urban area compared with the current land use area ratio is+2.3,+2.4,-6.1,+0.2,and+1.6,respectively.The economic and ecological value of land increases by14.1%and 3.1%,respectively,and the number of water resources can increase by 2.5%.
文摘The Platte River watershed,the largest river basin in Nebraska(1.06×105 km^(2)),crosses the entire state along its W-E course in the approximate N-S center of Nebraska.A plethora of historical(1968-1975)hydrochemistry data[major cations and anions,primarily]resulting from collection and analysis by the Nebraska Department of Environment and Energy(NDEE)were statistically and graphically analyzed and subjected to geochemical modeling.Interpretation of this large legacy dataset(31 Platte River systems sampling stations and 34 sampling sites on 22 tributaries)revealed several hydrochemical facies(Ca-HCO_(3)and three additional ones,encompassing Ca-SO_(4)and Na-SO_(4)facies solely in South Platte River discharge),and slight calcite and dolomite supersaturation comprising a line of evidence for the near thermodynamic equilibrium of the studied surface waters.Scatter plots of selected cations versus anions reveal the impact of silicate minerals(e.g.,feldspars)weathering on the aqueous hydrochemistry throughout the watershed.Relatively high concentrations of sulfate(up to 1100 mg/L)in numerous samples from the South Platte River are probably sourced by agricultural fertilizer,irrigation water,and dissolution of gypsum/anhydrite.NETPATH geochemical modeling identified 10 plausible models to simulate the significant decrease in SO_(4)levels downstream along the South Platte River.
