Changes of Vertical Groundwater Recharge with Increase in Thickness of Vadose Zone Simulated by One-Dimensional Variably Saturated Flow Model  

作　　者：Siyuan Huo Menggui Jin Xing Liang Dan Lin 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences [2]School of Environmental Studies, China University of Geosciences [3]Zhejiang Institute of Geology and Mineral Resource

出　　处：《Journal of Earth Science》2014年第6期1043-1050,共8页地球科学学刊（英文版）

基　　金：financially supported by the National Basic Research Program of China (No. 2010CB428802);the National Natural Science Foundation of China (Nos. 41172218, 41272258)

摘　　要：The thickness of vadose zone plays a critical role in vertical groundwater recharge. The decline of water table since the past decades due to long-term groundwater over-exploitation has resulted in deep vadose zone in North China Plain. One-dimensional variably saturated flow models were established by Hydrus-1D software and simulations were run under steady and continuous declining water table respectively to estimate the impact of increase in thickness of vadose zone on recharge process, quantity and recharge time. Luancheng area was selected to estimate recharge quantity considering steady and continuous declining water table. The simulation results show that the increase in thickness of vadose zone delays recharge process to water table. The recharge quantity decreases first and then remains stable with the decline of water table. Under the condition of declining water table, the evaluation of recharge by the flux at water table overestimates the recharge quantity. The average annual recharge rate of Luancheng area is 134 mm/a.The thickness of vadose zone plays a critical role in vertical groundwater recharge. The decline of water table since the past decades due to long-term groundwater over-exploitation has resulted in deep vadose zone in North China Plain. One-dimensional variably saturated flow models were established by Hydrus-1D software and simulations were run under steady and continuous declining water table respectively to estimate the impact of increase in thickness of vadose zone on recharge process, quantity and recharge time. Luancheng area was selected to estimate recharge quantity considering steady and continuous declining water table. The simulation results show that the increase in thickness of vadose zone delays recharge process to water table. The recharge quantity decreases first and then remains stable with the decline of water table. Under the condition of declining water table, the evaluation of recharge by the flux at water table overestimates the recharge quantity. The average annual recharge rate of Luancheng area is 134 mm/a.

关 键 词：North China Plain declining water table vertical groundwater recharge numerical simulation HYDRUS-1D 

分 类 号：P641.2[天文地球—地质矿产勘探] TP311.52[天文地球—地质学]