The influence of low-permeability cap on capillary pressure during pumping in unconfined aquifer

作     者：黄辉 钱家忠 匡星星 陈冰宇 马雷 吴亚楠 HUANG Hui;QIAN Jia-zhong;KUANG Xing-xing;CHEN Bing-yu;MA Lei;WU Ya-nan

作者机构：School of Resources and Environmental EngineeringHefei University of Technology Department of Earth SciencesThe University of Hong Kong 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2013年第25卷第6期

页      面：867-870页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0701[理学-数学] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.41272251) the Research Grants Council of the Hong Kong Special Administrative Region,China(Grant No.HKU 701908P) 

主　　题：low-permeability soil water content water pressure capillary pressure vadose zone pumping test 

摘      要：The pumping test in an unconfined aquifer with and without a low-permeability soil was studied experimentally to reveal the influence of the negative air pressure （NP） caused by the upper layer on the water content （w）, the water pressure （Pw）, as well as on the capillary pressure （Pc）. The study demonstrates that the NP generated in the vadose zone during pumping in the capper aquifer has a significant influence on w, Pw and Pc The Pc obtained from the capped aquifer is smaller than that without the upper layer. After the NP reaches a peak, the influence of the NP on Pc. is gradually declined as the air inflows through the upper layer which makes the NP gradually return to zero. When the air pressure returns to the atmospheric pressure, Pc in the vadose zone is only correlated with Pw, the same as the case with no upper layer.