Interaction between shallow groundwater, saline surface water and contaminant discharge at a seasonally and tidally forced estuarine boundary

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doi: 10.1016/j.jhydrol.2004.07.007
Authors:Westbrook, S. J.; Rayner, J. L.; Davis, Greg B.; Clement, T. P.; Bjerg, P. L.; Fisher, S. J.
Author Affiliations:Primary:
University of Western Australia, Department of Environmental Engineering, Nedlands, West. Aust., Australia
CSIRO Land and Water, Australia
Technical University of Denmark, Denmark
Volume Title:Journal of Hydrology
Source:Journal of Hydrology, 302(1-4), p.255-269. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0022-1694
Publication Date:2005
Note:In English. 33 refs.; illus., incl. 2 tables, sketch maps
Summary:This paper presents findings from a 2-year field investigation of a dissolved hydrocarbon groundwater plume flowing towards a tidally and seasonally forced estuarine river system in Perth, Western Australia. Samples collected from transects of multiport wells along the riverbank and into the river, enabled mapping of the fine scale (0.5 m) vertical definition of the hydrocarbon plume and its longitudinal extent. Spear probing beneath the river sediments and water table, and transient monitoring of multiport wells (electrical conductivity) was also carried out to define the zone of mixing between river water and groundwater (the hyporheic zone) and its variability. The results showed that groundwater seepage into the estuarine surface sediments occurred in a zone less than 10 m from the high tide mark, and that this distance and the hyporheic transition zone were influenced by tidal fluctuations and infiltration of river water into the sediments. The dissolved BTEXN (benzene, toluene, ethylbenzene, the xylene isomers and naphthalene) distributions indicated the behaviour of the hydrocarbon plume at the groundwater/surface water transition zone to be strongly influenced by edge-focussed discharge. Monitoring programs and risk assessment studies at similar contaminated sites should therefore focus efforts within the intertidal zone where contaminants are likely to impact the surface water and shallow sediment environments. Abstract Copyright (2005) Elsevier, B.V.
Subjects:Aromatic hydrocarbons; BTEX; Coastal environment; Contaminant plumes; Controls; Discharge; Electrical conductivity; Estuaries; Fluctuations; Ground water; Hydrocarbons; Instruments; Intertidal environment; Monitoring; Movement; Ocean circulation; Organic compounds; Pollutants; Pollution; River banks; Salinity; Seasonal variations; Sediments; Shallow depth; Solute transport; Solutes; Surface water; Theoretical models; Tides; Transition zones; Water quality; Water table; Australasia; Australia; Perth Australia; Western Australia; Canning River; Fremantle Australia; Swan River
Coordinates:S321500 S314500 E1160000 E1153000
Record ID:2005063608
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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