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本文应用有限单元模型MARUN,考察了海滩含水层中海潮引起的地下水位波动。模型的控制方程在空间上用三角单元离散,时间积分上用修正的皮卡迭代法。以一个典型海滩含水层为例,模拟结果表明地下水位的模拟值与观测值基本一致。通过模型参数校正,该海滩被识别为具有两层结构,即由高渗透性的表层和低渗透性的下层组成,低渗透性的下层使得地下水位位于两层交界面之上。对未受人工扰动的原始海滩中地下水水位进行模拟,结果表明坑的开挖对于地下水位几乎没有影响。
In this paper, the finite element model MARUN was used to investigate the fluctuation of groundwater level caused by the tidal flat in the beach aquifer. The governing equations of the model are spatially discretized by triangular elements and the time integral is modified by a modified pickup iteration method. Taking a typical beach aquifer as an example, the simulation results show that the simulated and observed values of groundwater level are basically the same. Through model parameter calibration, the beach was identified as having a two-layer structure consisting of a highly permeable topsheet and a low-permeability bottom layer, with a low-permeability lower layer allowing the groundwater table to be located above the two-layer interface. The simulation of groundwater levels in undisturbed pristine beaches showed that excavation of the pit had little effect on groundwater level.