Tidal wave propagation in a coastal aquifer: Effects of leakages through its submarine outlet-capping and offshore roof
Tidal wave propagation in a coastal aquifer: Effects of leakages through its submarine outlet-capping and offshore roof
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潮汐波在沿海含水层中的传播：海底出水口和近海顶板渗漏的影响
DOI：
10.1016/j.jhydrol.2007.01.036
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发表时间：
2007-04
影响因子：
6.4
通讯作者：
Boufadel, M. C.
中科院分区：
文献类型：
--
作者：
Li, H. L.;Li, G. H.;Xia, Y. Q.;Guo, Q.;Boufadel, M. C.
本文考虑了一个越流含水层系统，它包括一个非承压含水层、一个承压含水层和一个封闭层（含水层顶板）。非承压含水层终止于海岸线，承压含水层及其顶板在海底延伸一定距离。含水层的海底出口覆盖着一层薄薄的沉积物（以下称为“出口封盖”），其性质与含水层不同。以往的研究要么忽略了通过含水层的顶部或出口盖渗漏。本文考虑了这两种影响，给出了描述含水层系统中潮汐引起的水头波动的解析解。对于离岸长度为零或无限长的含水层，或具有不透水顶板或出口封盖的含水层，或没有出口封盖的含水层，文献中已有的解决方案。我们定义的阈值为近海含水层的长度，这是发现小于5公里的典型的沿海含水层系统。当含水层的离岸长度大于阈值时，内陆水头波动对离岸长度的变化和出口盖层的漏失不敏感。通过海上顶板的渗漏降低了阈值。当离岸承压含水层较短时，内陆水头波动随出水口盖层渗漏量的增大而增大。在这种情况下，只有通过离岸顶板和出口封盖有少量渗漏的含水层在海岸线附近才会发生负相移。在一般情况下，潮汐载荷，泄漏和长度的离岸顶板，和泄漏的出口盖的联合行动导致复杂的，非单调的依赖关系的内陆头波动的含水层参数。
This paper considers a leaky aquifer system comprising an unconfined aquifer, a confined aquifer, and a confining layer (the aquifer’s roof). The unconfined aquifer terminates at the coastline, the confined aquifer and its roof extend under the sea for a certain distance. The aquifer’s submarine outlet is covered by a thin layer of sediment (referred to as the “outlet-capping” hereafter) with properties dissimilar to the aquifer. Previous studies either neglected the leakage through the aquifer’s roof or the outlet-capping. This paper considers both effects and gives an analytical solution to describe the tide-induced head fluctuation in the aquifer system. For aquifers with zero or infinite offshore length, or with impermeable roof or outlet-capping, or without the outlet-capping, existing solutions in the literature are obtained. We defined the threshold value for the offshore aquifer length, which was found to be less than 5km for typical coastal aquifer systems. For an aquifer with its offshore length greater than the threshold, the inland head fluctuation becomes insensitive to variations of this length and the outlet-capping’s leakance. The leakage through the offshore roof decreases the threshold value. When the offshore confined aquifer is short, the inland head fluctuation increases with the outlet-capping’s leakance. In this case negative phase shift occurs near the coastline only for aquifers with small leakages through the offshore roof and the outlet-capping. In general, the combined actions of the tidal loading, the leakage and length of the offshore roof, and the leakage of the outlet-capping lead to complex, non-monotonic dependency of the inland head fluctuation on the aquifer parameters.
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