Estimating freshwater lens volume in highly permeable aquifers

IF 0.6 Q4 WATER RESOURCES

Hydrological Research Letters Pub Date : 2022-01-01 DOI:10.3178/hrl.16.12

Satoshi Tajima, Jiaqing Liu, T. Tokunaga

引用次数: 0

Abstract

: A unique freshwater lens shape observed in Tarama Island, Japan, in which hydraulic conductivity is on the order of 10 −2 m s −1 , has posed a question as to how well we can estimate the fresh groundwater volumes in extremely permeable aquifers. We applied both an analytical model and numerical simulations with various hydraulic conduc‐ tivities, including extremely permeable conditions, and compared their results. The simulation showed that, when the hydraulic conductivity was extremely high, saline groundwater existed near the coast. The analytical model overestimated the freshwater volume compared with those estimated from the numerical simulations, and the discrep‐ ancy became more significant with increasing hydraulic conductivity. These findings imply that, when hydraulic conductivity is extremely high, numerical simulations con‐ sidering density-dependent flow and dispersive mass trans‐ port processes should be applied to better assess the shapes and volumes of freshwater lenses.

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估计高渗透性含水层的淡水透镜体体积

在日本Tarama岛观测到一个独特的淡水透镜形状，其中的水力导电性约为10 - 2 m s - 1，这就提出了一个问题，即我们可以如何很好地估计极渗透性含水层中的新鲜地下水体积。我们将分析模型和数值模拟应用于不同的水力导电性，包括极端渗透性条件，并比较了它们的结果。模拟结果表明，当水导率极高时，海岸附近存在含盐地下水。与数值模拟结果相比，解析模型高估了淡水体积，并且随着水力导度的增加，差异变得更加显著。这些发现表明，当水力导电性非常高时，应采用考虑密度依赖流动和弥散质量传递过程的数值模拟来更好地评估淡水透镜的形状和体积。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrological Research Letters WATER RESOURCES-

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

10 weeks

期刊介绍： Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.