期刊
JOURNAL OF HYDROLOGY
卷 521, 期 -, 页码 556-564出版社
ELSEVIER
DOI: 10.1016/j.jhydrol.2014.12.015
关键词
Analytical solution; Two-dimensional groundwater flow; Tile drainage
资金
- National Nature Science Foundation of China [NSFC-41272260, NSFC-41330314, NSFC-41302180]
- Natural Science Foundation of Jiangsu Province [SBK201341336]
- National Key project Water Pollution Control of China [2012ZX07204-001, 2012ZX07204-003]
The tile drainage problem in an unconfined aquifer was investigated. A mathematical model was established that describes two-dimensional groundwater flow in an unconfined aquifer near a river with a linearized Boussinesq equation, time-dependent sources and a sloped tile. Analytical solutions for groundwater level and discharge were derived and used to compare hydrologic conditions in a system with and without tile (natural drainage). We found that the spatial and temporal variations of groundwater level and discharge were significantly altered by the presence of drainage tile. In an aquifer with tile drainage, the groundwater level was lower and total groundwater discharge to the river increased compared to an aquifer with no tile. Application of the solutions to a synthetic case demonstrates that the analytical solutions derived can be used to quantify effect of tiles on nitrate loads in the baseflow of a river and assess the effectiveness of various conservation practices. (C) 2014 Elsevier B.V. All rights reserved.
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