Prediction of water table depths under soil water-groundwater interaction and stream water conveyance  

作　　者：DI ZhenHua XIE ZhengHui YUAN Xing TIAN XiangJun LUO ZhenDong CHEN YaNing 

机构地区：[1]ICCES/LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [2]School of Science, Beijing Jiaotong University, Beijing 100044, China [3]Department of Mathematics & Physics, North China Electric Power University, Beijing 102206, China [4]Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China

出　　处：《Science China Earth Sciences》2011年第3期420-430,共11页中国科学（地球科学英文版）

基　　金：supported by National Basic Research Program (Grant Nos. 2010CB428403, 2010CB951001);Chinese COPES Project (Grant No. GYHY200706005);National High Technology Research and Development Program of China (Grant No. 2009AA12Z129)

摘　　要：Water table over an arid region can be elevated to a critical level to sustain terrestrial ecosystem along the natural channel by the stream water conveyance. Estimation of water table depth and soil moisture on river channel profile may be reduced to a two-dimensional moving boundary problem with soil water-groundwater interaction. The two-dimensional soil water flow with stream water transferred is divided into an unsaturated vertical soil water flow and a horizontal groundwater flow. Therefore, a prediction model scheme for water table depths under the interaction between soil water and groundwater with stream water transferred is presented, which includes a vertical soil water movement model, a horizontal groundwater movement model, and an interface model. The synthetic experiments are conducted to test the sensitivities of the river elevation, horizontal conductivity, and surface flux, and the results from the experiments show the robustness of the proposed scheme under different conditions. The groundwater horizontal conductivity of the proposed scheme is also calibrated by SCE-UA method and validated by data collected at the Yingsu section in the lower reaches of the Tarim River, which shows that the model can reasonably simulate the water table depths.Water table over an arid region can be elevated to a critical level to sustain terrestrial ecosystem along the natural channel by the stream water conveyance. Estimation of water table depth and soil moisture on river channel profile may be reduced to a two-dimensional moving boundary problem with soil water-groundwater interaction. The two-dimensional soil water flow with stream water transferred is divided into an unsaturated vertical soil water flow and a horizontal groundwater flow. Therefore, a prediction model scheme for water table depths under the interaction between soil water and groundwater with stream water transferred is presented, which includes a vertical soil water movement model, a horizontal groundwater movement model, and an interface model. The synthetic experiments are conducted to test the sensitivities of the river elevation, horizontal conductivity, and surface flux, and the results from the experiments show the robustness of the proposed scheme under different conditions. The groundwater horizontal conductivity of the proposed scheme is also calibrated by SCE-UA method and validated by data collected at the Yingsu section in the lower reaches of the Tarim River, which shows that the model can reasonably simulate the water table depths.

关 键 词：stream water conveyance soil water-groundwater interaction model SCE-UA method 

分 类 号：S152.7[农业科学—土壤学] P641.2[农业科学—农业基础科学]