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《Resources Science》 2009-07
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Influences of Climatic Anomaly on the Groundwater System in Linfen Basin

WANG Yeyao1,2,BAI Liping1,2,WANG Jinsheng2 (1.Chinese Academy of Environmental Sciences, Beijing 100012, China; 2. School of Water Sciences, Beijing Normal University, Beijing 100875, China)  
Climatic fluctuation can exert a considerable impact on the groundwater circulation. Based on a case study in Linfen Basin, the impacts of climatic change on groundwater circulation are assessed. The study area is located in the middle and lower reaches of the Yellow River basin, and the total area of the basin is approximately 4686 km2. The groundwater floor in the study area can be divided into three aquifers, which are phreatic aquifer, middle confined aquifer and deep confined aquifer. The phreatic aquifer and the middle confined aquifer are the main targets of exploitation, so the water level changes in response to climatic anomaly in these two aquifers are focused on in this paper. To start with, balance analysis of the groundwater resources is carried out. The groundwater recharge process includes precipitation infiltration, surface water leakage and lateral recharge, while the groundwater discharge process includes evaporation and artificial exploitation. The climatic anomaly can be identified by the appearance of two extra drought periods when the annual rainfall of the last 50 years is analyzed. Then, the groundwater level change under extraordinary climate is estimated by the numerical simulation. According to the hydro-geological conditions of Linfen basin, the numerical model of the phreatic aquifer and the confined aquifer is constructed with GMS. Also, the model is calibrated by the data of monitored groundwater levels. Repeatedly computing reduces 70.9 percent of the error ranges between simulated and monitored water level of the phreatic aquifer below 0.5 meter, and that of the confined aquifer below 1 meter. The simulation results prove that the calibrated model can reflect the actual hydro-geological conditions, so it can represent the actual water level changes. Therefore, the change of the groundwater level under climatic anomaly is simulated by the calibrated numerical model. According to the simulation results, the groundwater level of the phreatic aquifer may fall by 0.3 to 0.9 meter, and that of the confined aquifer may fall 2.5 to 5 meters in response to climatic anomaly. The continuous and intensive exploitation of groundwater has caused many problems in Linfen basin, such as groundwater level declining, surface subsidence, and land crack. The sharp decline of groundwater level under climatic anomaly can exacerbate the land subsidence. It is suggested that the local government should be prepared to deal with climatic anomaly to prevent the water shortage and ground water floor degradation.
【Fund】: 国家重点基础研究发展规划项目(编号:G1999043606)
【CateGory Index】: P641
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