ABSTRACT Determination of the hydraulic properties of a coastal aquifer system with lower cost and acceptable accuracy has practical implications. Although many theoretical solutions have been developed over recent decades, most of them assume that an aquifer system extends inland and subjected a single-frequency tidal fluctuation on coastline boundary. In addition, only one hydraulic parameter, i.e., the hydraulic diffusivity, of an aquifer can be obtained in most cases. In this paper, the solution of groundwater response in a leaky confined coastal aquifer to dual frequency tidal fluctuations has been established. The new solution was then used as an example to discuss the applicability and limitations of using tidal fluctuations for determining coastal aquifer hydraulic properties. Our study illustrated that ocean tides could only transport to a limited distance towards inland depending on the coastal aquifer hydraulic properties. The tidal method is applicable only when changes in the hydraulic head within in a monitoring well can be detected with an acceptable accuracy. Both the hydraulic diffusivity and leakage can be identified from the monitored hydraulic heads. By incorporating the use of aquifer thickness, the transmissivity and storage coefficient of a perfectly confined aquifer can also be simultaneously estimated.

中文翻译：

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利用地下水对潮汐波动的响应确定沿海含水层系统的水力特性：适用性和局限性

摘要 以较低的成本和可接受的精度确定沿海含水层系统的水力特性具有实际意义。尽管近几十年来已经开发了许多理论解决方案，但大多数都假设含水层系统向内陆延伸并在海岸线边界上受到单频潮汐波动。此外，在大多数情况下，只能获得一个含水层的水力参数，即水力扩散系数。在本文中，已经建立了泄漏的承压沿海含水层中地下水对双频潮汐波动的响应的解决方案。然后以新解决方案为例，讨论使用潮汐波动确定沿海含水层水力特性的适用性和局限性。我们的研究表明，根据沿海含水层的水力特性，海洋潮汐只能向内陆输送有限的距离。潮汐法仅适用于可以以可接受的精度检测到监测井内水头变化的情况。水力扩散系数和泄漏都可以从监测到的水压头中识别出来。通过结合使用含水层厚度，还可以同时估算完全承压含水层的透射率和蓄水系数。水力扩散系数和泄漏都可以从监测到的水压头中识别出来。通过结合使用含水层厚度，还可以同时估算完全承压含水层的透射率和蓄水系数。水力扩散系数和泄漏都可以从监测到的水压头中识别出来。通过结合使用含水层厚度，还可以同时估算完全承压含水层的透射率和蓄水系数。