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dc.contributor.authorKoohbor, Behshad
dc.contributor.authorFahs, Marwan
dc.contributor.authorAtaie-Ashtiani, Behzad
dc.contributor.authorSimmons, Craig Trevor
dc.contributor.authorYounes, Anis
dc.date.accessioned2018-04-09T00:35:21Z
dc.date.available2018-04-09T00:35:21Z
dc.date.issued2018-03-21
dc.identifier.citationKoohbor, B., Fahs, M., Ataie-Ashtiani, B., Simmons, C. T., & Younes, A. (2018). Semianalytical solutions for contaminant transport under variable velocity field in a coastal aquifer. Journal of Hydrology, 560, 434–450. https://doi.org/10.1016/j.jhydrol.2018.03.048en_US
dc.identifier.issn0022-1694
dc.identifier.urihttp://hdl.handle.net/2328/37878
dc.description© 2017 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license: http://creativecommons.org/licenses/by-nc-nd/4.0/ This author accepted manuscript is made available following 24 month embargo from date of publication (March 2018) in accordance with the publisher’s archiving policyen_US
dc.description.abstractExisting closed-form solutions of contaminant transport problems are limited by the mathematically convenient assumption of uniform flow. These solutions cannot be used to investigate contaminant transport in coastal aquifers where seawater intrusion induces a variable velocity field. An adaptation of the Fourier-Galerkin method is introduced to obtain semi-analytical solutions for contaminant transport in a confined coastal aquifer in which the saltwater wedge is in equilibrium with a freshwater discharge flow. Two scenarios dealing with contaminant leakage from the aquifer top surface and contaminant migration from a source at the landward boundary are considered. Robust implementation of the Fourier-Galerkin method is developed to efficiently solve the coupled flow, salt and contaminant transport equations. Various illustrative examples are generated and the semi-analytical solutions are compared against an in-house numerical code. The Fourier series are used to evaluate relevant metrics characterizing contaminant transport such as the discharge flux to the sea, amount of contaminant persisting in the groundwater and solute flux from the source. These metrics represent quantitative data for numerical code validation and are relevant to understand the effect of seawater intrusion on contaminant transport. It is observed that, for the surface contamination scenario, seawater intrusion limits the spread of the contaminant but intensifies the contaminant discharge to the sea. For the landward contamination scenario, moderate seawater intrusion affects only the spatial distribution of the contaminant plume while extreme seawater intrusion can increase the contaminant discharge to the sea. The developed semi-analytical solution presents an efficient tool for the verification of numerical models. It provides a clear interpretation of the contaminant transport processes in coastal aquifers subject to seawater intrusion. For practical usage in further studies, the full open source semi-analytical codes are made available at the website https://lhyges.unistra.fr/FAHS-Marwan.en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rights© 2018 Elsevier B.V. All rights reserved.en_US
dc.subjectContaminant transporten_US
dc.subjectCoastal aquiferen_US
dc.subjectSeawater intrusionen_US
dc.subjectSemi-analytical solutionen_US
dc.subjectFourier seriesen_US
dc.titleSemianalytical solutions for contaminant transport under variable velocity field in a coastal aquiferen_US
dc.typeArticleen
dc.identifier.doihttps://doi.org/10.1016/j.jhydrol.2018.03.048en
dc.rights.holderElsevier B.V.en_US
dc.rights.licenseCC-BY-NC-ND
local.contributor.authorOrcidLookupAtaie-Ashtiani, Behzad: https://orcid.org/0000-0002-1339-3734en_US
local.contributor.authorOrcidLookupSimmons, Craig Trevor: https://orcid.org/0000-0001-5399-6292en_US


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