Tide-Induced Ground-Water Flow in Deep Confined Aquifer
Tide-Induced Ground-Water Flow in Deep Confined Aquifer
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DOI：
10.1061/(asce)0733-9429(1996)122:2(104
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发表时间：
1996-02
影响因子：
2.4
通讯作者：
ko-fei Liu
中科院分区：
文献类型：
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作者：
ko-fei Liu
即使在远离海岸线的地方，由于潮汐的影响，河流的水位变化也会很大。对于深层承压含水层，河流渗漏的可能性很小。然而，河流高程的波动会引起土壤中的应力变化，进而引起地下水的流动。本研究的重点是波动的影响，假设固结的时间尺度远大于地下水。深层承压含水层中总应力的变化通过变形土介质影响承压水头。如果地下剖面只包含一个占主导地位的承压含水层，一个垂直平均的一维问题与周期性的总应力变化和恒定的线抽水检查。控制方程是一个带有时变强迫项的线性扩散方程。调用拉普拉斯变换和傅立叶变换。响应空间分布为误差函数型。由于线性，泵浦效应可以叠加。远离载荷的较深含水层而不是接近地面的含水层受到动态载荷的影响。压力峰值出现较早的位置远离负载。现场数据支持该模型。
Water-elevation variation in rivers can be large due to tides even far away from the coastline. For deep confined aquifers, the possibility of leakage from rivers is small. Nevertheless, the fluctuation of river elevation can induce a stress change in soil and in turn can induce ground-water flow below. The present study focuses on the effect of the fluctuation assuming the time scale for consolidation is much larger than that of the ground water. The total stress change in the deep confined aquifer affects the water-pressure head through deformable soil medium. If the subsurface profile contains only one dominant confined aquifer, a vertically averaged one-dimensional problem with periodic total stress change and constant line pumping is examined. The governing equation is a linear diffusion equation with time-varying forcing terms. Laplace transform and Fourier transform are invoked. The response distribution in space is of the error-function type. The pumping effect can be superimposed due to linearity. Away from the loading, deeper aquifers rather than those close to the ground surface are affected by the dynamic loading. Pressure peaks appear earlier for location farther away from the loading. Field data support the model.