Numerical simulation of sea water intrusion near Beihai, China |
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| Authors: | X Zhou M Chen X Ju X Ning J Wang |
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| Institution: | (1) Department of Water Resources and Environmental Engineering, China University of Geosciences, Xueyuan Road 29, Beijing 100083, P.R. China e-mail: zhouxun@cugb.edu.cn Tel.: +10-82322875, CN;(2) Beihai Institute of Hydrogeology, Engineering Geology and Mineral Resources, Beihai, Guangxi 537000, P.R. China, CN |
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| Abstract: | A leaky aquifer system occurs in the coastal plain near Beihai, China. Seawater intrusion into the confined aquifer took
place along the northern coast. Chloride concentrations at some observation wells increased steadily from 1988 and were at
their peak in 1993. A quasi-three-dimensional element model has been developed to simulate the spatial and temporal evolution
of hydraulic heads and chloride concentrations of the groundwater near the northern coast. The simulation model was based
on the transition zone approach, which requires simultaneous solution of the governing water flow and solute transport equations.
An irregular grid of a quadrangle was used to discretize the flow domain. Various aquifer parameters were verified with the
numerical model in order to obtain satisfactory matches between computed values and observed data from an investigation. Three
pumpage schemes were designed to use the calibrated model for prediction of future changes in water levels and chloride concentrations
in groundwater in the study area. Results show that seawater intrusion would worsen in the confined aquifer if the current
rates of groundwater pumpage continue. The alternative, to eliminate pumpage in the intruded area and to moderate pumpage
rates from water supply wells far from the seashore, may limit seawater intrusion significantly and is considered attractive
in the area.
Received: 27 September 1999 · Accepted: 27 December 1999 |
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| Keywords: | Coastal aquifers Seawater intrusion Leaky aquifer system Numerical modeling Numerical simulation |
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