Characterisation of sea-water intrusion in the Pioneer Valley, Australia using hydrochemistry and three-dimensional numerical modelling

Werner, A. D. and Gallagher, M. R. (2006) Characterisation of sea-water intrusion in the Pioneer Valley, Australia using hydrochemistry and three-dimensional numerical modelling. Hydrogeology Journal, 14 8: 1452-1469. doi:10.1007/s10040-006-0059-7


Author Werner, A. D.
Gallagher, M. R.
Title Characterisation of sea-water intrusion in the Pioneer Valley, Australia using hydrochemistry and three-dimensional numerical modelling
Journal name Hydrogeology Journal   Check publisher's open access policy
ISSN 1431-2174
Publication date 2006
Sub-type Article (original research)
DOI 10.1007/s10040-006-0059-7
Volume 14
Issue 8
Start page 1452
End page 1469
Total pages 18
Editor Clifford Voss
Place of publication New York
Publisher Springer
Collection year 2006
Language eng
Subject C1
770602 Land and water management
290800 Civil Engineering
Abstract Sea-water intrusion is actively contaminating fresh groundwater reserves in the coastal aquifers of the Pioneer Valley,north-eastern Australia. A three-dimensional sea-water intrusion model has been developed using the MODHMS code to explore regional-scale processes and to aid assessment of management strategies for the system. A sea-water intrusion potential map, produced through analyses of the hydrochemistry, hydrology and hydrogeology, offsets model limitations by providing an alternative appraisal of susceptibility. Sea-water intrusion in the Pioneer Valley is not in equilibrium, and a potential exists for further landward shifts in the extent of saline groundwater. The model required consideration of tidal over-height (the additional hydraulic head at the coast produced by the action of tides), with over-height values in the range 0.5-0.9 m giving improved water-table predictions. The effect of the initial water-table condition dominated the sensitivity of the model to changes in the coastal hydraulic boundary condition. Several salination processes are probably occurring in the Pioneer Valley, rather than just simple landward sea-water advancement from modern sources of marine salts. The method of vertical discretisation (i.e. model-layer subdivision) was shown to introduce some errors in the prediction of watertable behaviour.
Keyword saltwater/freshwater relations
numerical modelling
coastal aquifers
salination
Australia
Variable-density Flow
Seawater Intrusion
Coastal Aquifer
Groundwater Dynamics
Benchmark Problem
Simulation
Transport
Salinization
Florida
System
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
2007 Higher Education Research Data Collection
 
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Created: Wed, 15 Aug 2007, 09:43:10 EST