Analytical studies of groundwater-head fluctuation in a coastal confined aquifer overlain by a semi-permeable layer with storage |
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| Institution: | 1. Department of Earth Sciences, The University of Hong Kong, James Lee Sciences Building, Pokfulam Road, Hong Kong, People''s Republic of China;2. Anshan Normal College, Anshan 114005, Liaoning, People''s Republic of China;1. Griffith School of Engineering, Gold Coast Campus, Griffith University, Queensland 4222, Australia;2. School of Civil Engineering, The University of Queensland, 4072, Australia;3. Centre d’hydrogéologie, Rue Emile-Argand 11, Case postale 158, 2009 Neuchâtel, Switzerland;1. Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany;2. Federal Institute for Geosciences and Natural Resources, Berlin, Germany;3. Technische Universität Dresden, Germany;4. Friedrich Schiller University, Jena, Germany;1. Department of Geological Sciences, The University of Texas at Austin, Austin, TX, United States;2. School of the Environment, Washington State University Vancouver, Vancouver, WA, United States;1. Institute of Environmental Assessment and Water Research (IDAEA), CSIC, c/ Jordi Girona 18, 08034 Barcelona, Spain;2. Associated Unit: Hydrogeology Group (UPC-CSIC), Barcelona, Spain;3. TK Consult AG, Zürich, Switzerland;4. Instituto de Geología de Costas y del Cuaternario, Universidad Nacional de Mar del Plata (UNMDP), Mar del Plata, Argentina;1. School of Earth Sciences and Engineering, Hohai University, No. 8 Fochengxi Road, Nanjing, Jiangsu Province, 211100, China;2. Department of Earth and Environmental Sciences, University of Waterloo, 200 University Ave. W., Waterloo, Ontario, N2L 3G1, Canada;1. Department of Civil and Environmental Engineering, Washington State University, PO Box 642910, Pullman, WA 99164-2910, USA;2. National Centre for Groundwater Research and Training, School of the Environment, Flinders University, Adelaide, South Australia, Australia;3. Department of Civil Engineering, Catholic University of America, Washington, DC, USA |
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| Abstract: | Analytical studies are carried out to investigate groundwater-head changes in a coastal aquifer system in response to tidal fluctuations. The system consists of an unconfined aquifer, a semi-confined aquifer and a semi-permeable confining unit between them. An exact analytical solution is derived to investigate the influences of both leakage and storage of the semi-permeable layer on the tide-induced groundwater-head fluctuation in the semi-confined aquifer. This solution is a generalization of the solution obtained by Jiao and Tang (Water Resource Research 35 (1999) 747–751) which ignored the storage of the semi-confining unit. The analytical solution indicates that both storage and leakage of the semi-permeable layer play an important role in the groundwater-head fluctuation in the confined aquifer. While leakage is generally more important than storage, the impact of storage on groundwater-head fluctuations changes with leakage. With the increase of leakage the fluctuation of groundwater-head in the confined aquifer will be controlled mainly by leakage. The study also demonstrates that the influence of storativity of the semi-permeable layer on groundwater-head fluctuation is negligible only when the storativity of the semi-permeable layer is comparable to or smaller than that of the confined aquifer. However, for aquifer systems with semi-permeable layer composed of thick, soft sedimentary materials, the storativity of the semi-permeable layer is usually much greater than that of the aquifer and its influence should be considered. |
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