Response of the salt–freshwater interface in a coastal aquifer to a wave-induced groundwater pulse: field observations and modelling

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Title Response of the salt–freshwater interface in a coastal aquifer to a wave-induced groundwater pulse: field observations and modelling
Author Cartwright, Nicholas Brian; Li, L.; Nielsen, P.
Journal Name Advances in Water Resources
Year Published 2004
Place of publication United Kingdom
Publisher Pergamon
Abstract Field observations on an unconfined coastal aquifer showed that a groundwater pulse, generated by a moderate (significant wave height, Hsig~4.5 m) wave/storm event, induced significant oscillations in the salt–freshwater "interface" of the order of several metres in the horizontal direction. A dynamic sharp-interface model is developed to quantify the mechanism of these interface oscillations. The model uses the 50% seawater salinity contour as the location of the equivalent sharp-interface. The model was calibrated against the observed groundwater table fluctuations. It predicted reasonably well the interface oscillations with a slight over-prediction of the oscillation magnitude and a steepening of the interface. The neglect of mixing in the salt–freshwater mixing zone by the sharp-interface model is suggested as a possible contributor to the discrepancies between the model predictions and observations. In contrast with the significant wave effects, there was no observable response of the interface to diurnal or semi-diurnal tides.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.elsevier.com/wps/find/journaldescription.cws_home/422913/description#description
Alternative URI http://dx.doi.org/10.1016/j.advwatres.2003.12.005
Volume 27
Issue Number 3
Page from 297
Page to 303
ISSN 0309-1708
Date Accessioned 2006-06-27
Date Available 2009-01-20T06:11:21Z
Language en_AU
Research Centre Centre for Infrastructure Engineering and Management
Faculty Faculty of Engineering and Information Technology
Subject PRE2009-Groundwater Hydrology
URI http://hdl.handle.net/10072/16713
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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