Inverse groundwater modelling in the Willunga Basin,South Australia |
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Authors: | Ian Knowles Michael Teubner Aimin Yan Paul Rasser Jong Wook Lee |
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Institution: | (1) Department of Mathematics, University of Alabama at Birmingham, Birmingham, AL 35294, USA;(2) Applied Mathematics, The University of Adelaide, Adelaide, South Australia, 5005, Australia;(3) Department of Radiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA;(4) Neuroscience Institute of Schizophrenia and Allied Disorders, Gavan Institute of Medical Research, Sydney, New South Wales, 2010, Australia;(5) River Murray Water Division, Murray-Darling Basin Commission, P.O. BOX 409, Canberra, 2601, Australia |
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Abstract: | A new inverse technique for modelling groundwater flow, based on a functional minimization technique, has been used to calibrate
a groundwater flow model of a subregion of the Port Willunga aquifer within the Willunga Basin in South Australia. The Willunga
Basin is the location of extensive viticulture, irrigated primarily by groundwater, the levels and quality of which have declined
significantly over the last 40 years. The new method is able to generate estimates of transmissivity, storativity and groundwater
recharge over the whole subregion as a time-varying continuous surface; previous methods estimate local discrete parameter
values at specific times. The new method has also been shown to produce accurate head values for the subregion and very good
estimates of groundwater recharge. Its ultimate goal will be to provide a new and invaluable tool for significantly improved
groundwater resource management.
Supported in part by US National Science Foundation grants, DMS-0107492 and DMS-0079478. |
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Keywords: | Groundwater flow Inverse modelling Numerical modelling Parameter estimation Willunga Basin |
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