露头处具有淤泥层的滨海含水层系统中海潮引起的水头波动

李海龙; 任亚坤; 李国徽; 郭巧娜

Volume 33 Issue 2

Mar. 2008

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Citation:

LI Hai-long, REN Ya-kun, LI Guo-hui, GUO Qiao-na, 2008. Tidal Fluctuation in a Coastal Aquifer System with a Suboutcrop Covered by a Silt Layer. Earth Science, 33(2): 273-278.

Citation:

LI Hai-long, REN Ya-kun, LI Guo-hui, GUO Qiao-na, 2008. Tidal Fluctuation in a Coastal Aquifer System with a Suboutcrop Covered by a Silt Layer. Earth Science, 33(2): 273-278.

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Tidal Fluctuation in a Coastal Aquifer System with a Suboutcrop Covered by a Silt Layer

1.
Department of Mathematics, Anshan Normal University, Anshan 114007, China
2.
School of Environmental Studies &(MOE)Biogeology and Environmental Geology Lab, China University of Geosciences, Wuhan 430074, China

Received Date: 2007-04-11
Publish Date: 2008-03-25

Abstract

Abstract

With the social and economic development in coastal areas, a variety of hydrogeological problems arise.In order to solve these problems, it is necessary to study hydraulic relation between ground water and seawater.This paper explores the tide-induced ground water head fluctuation in a coastal multi-layered aquifer system with a suboutcrop covered by a silt layer.The system consists of an unconfined aquifer, a leaky confined aquifer and a semi-permeable layer in the middle.The mathematical model for describing the system is built and the analytical solution to the model is derived.The analytical solution contains two dimensionless parameters: the leakances of the semi-permeable layer and the silt-layer, respectively.The silt layer reduces the amplitude of the hydraulic head fluctuation by a constant factor, and increases the phase by a positive shift (time-lag), both of which depend on the leakances of the silt layer and the semi-permeable layer.The time lag does not exceed 1.5 h and 3.0 h for semidiurnal and diurnal sea tides, respectively.When the leakance of the semi-permeable layer or the silt layer assumes certain special values, the solutions are in accordance with the ones derived by several previous researchers.The amplitude of the hydraulic head fluctuation in the confined aquifer increases with the leakance of the silt-layer and decreases with the leakance of the semi-permeable layer; while the phase shift of fluctuation decreases with both of them.The solution analysis indicates that both the silt layer and the leakance of the semi-permeable layer influence significantly the hydraulic head fluctuation in the confined aquifer.
- tide,
- coastal aquifer system,
- silt-layer boundary,
- submarine outcrop,
- leakance,
- analytical solution,
- leakance of the silt layer

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致谢: 该项研究得到国家自然科学基金面上项目(No.40372111) 资助.

References(27)

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