期刊
JOURNAL OF HYDROLOGY
卷 450, 期 -, 页码 17-24出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhydrol.2012.05.036
关键词
Unconfined aquifer; Linearized Boussinesq equation; Recharge estimation; Groundwater recharge; Discharge estimation
资金
- National Nature Science Foundation of China [NSFC-413131012]
- China's National Key Project of Science and Technology, Pollution Control on the Huai River Basin [2009ZX07210-010]
A new analytical method was proposed for groundwater recharge and discharge estimation in an unconfined aquifer. The method is based on an analytical solution to the Boussinesq equation linearized in terms of h(2), where h is the water table elevation, with a time-dependent source term. The solution derived was validated with numerical simulation and was shown to be a better approximation than an existing solution to the Boussinesq equation linearized in terms of h. By calibrating against the observed water levels in a monitoring well during a period of 100 days, we shown that the method proposed in this study can be used to estimate daily recharge (R) and evapotranspiration (ET) as well as the lateral drainage. It was shown that the total R was reasonably estimated with a water-table fluctuation (WTF) method if the water table measurements away from a fixed-head boundary were used, but the total ET was overestimated and the total net recharge was underestimated because of the lack of consideration of lateral drainage and aquifer storage in the WTF method. (c) 2012 Elsevier B.V. All rights reserved.
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