Environmental impact assessment of risk associated with groundwater overdraft remediation in cone of depression,Jining, China |
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Authors: | B T I Ong′or Long-cang Shu Pei-gui Liu |
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Institution: | (1) College of Water Resources and Environment, Hohai University, Nanjing, 210098, China;(2) College of Science and Technology, Western University, P.O. Box 190, Kakamega, 50100, Kenya |
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Abstract: | In this paper, a simple scenario and probabilistic approach is used to assess the potential groundwater risk due to proposed
overdraft remedial actions in cone of depression, Jining City, China. Focusing on the concentrations of Chloride ions (Cl−) and total hardness (TH), the impact of artificial recharge and reduced pumping on groundwater quality and quantity is analysed
by using the three-dimensional finite difference groundwater flow and transport model, Visual MODFLOW, to simulate groundwater
flow and transport within the study area based on scenarios, and utilizes SURFER software to map risk levels. Although 5,
10 or 15% reduced pumping with artificial recharge leads to more decrease in Cl− and TH concentrations than the 25%, less volume increase is achieved for the remediation of land subsidence and other environmental
problems in the cone of depression. The Cl− concentrations in recovered groundwater are within the desired concentration of 200 mg/l; however, TH in some cases are above
the maximum permissible limit of 500 mg/l, with an exceedence probability of about 0.67 for recharge and recharge with reduced
pumping at 25%. The presence of fractures and hydrogeological complexity greatly determines impacts of remediation, and the
22% reduced pumping with artificial recharge offers an optimum strategy for overdraft remediation in the Jining cone of depression. |
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Keywords: | Risk assessments Artificial recharge Reduced pumping Groundwater quality and quantity Visual MODFLOW Jining China |
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