The hydrogeology of the Condamine River Alluvial Aquifer, Australia: a critical assessment | Hydrogéologie de l’aquifère alluvial de la rivière la Condamine, Australie: analyse critique La hidrogeología del acuífero aluvial del Río Condamine, Australia: una evaluación crítica 澳大利亚Condamine河冲积含水层的水文地质条件:决定性的评价 ההידרוגיאולוגיה של האקויפר האלוביאלי של נהר הקונדמיין (Condamine), אוסטרליה: הערכה ביקורתית Hidrogeologia da Planície Aluvial do Rio Condamine, Austrália: avaliação crítica
2014
Dafny, Elad | Silburn, D Mark
The Condamine plain is an important agricultural zone in Australia with prominent irrigated cotton and grain crops. About one third of the irrigation water is pumped from the shallow alluvial aquifer, causing gross aquifer depletion over time. Over the last few decades, various hydrological, hydrochemical, and geological aspects of this aquifer and the overlying floodplain (including soil properties) have been investigated and used to construct the conceptual understanding and numerical models for management of this resource. Yet, the water balance of the aquifer is still far from resolved, and the geological contact between the alluvial sediments and underlying bedrock is yet to be categorically defined, to mention two major uncertainties. This report collates up-to-date knowledge of different disciplines, critically evaluates the accepted hydrogeological conventions, highlights key knowledge gaps, and suggests strategies for future research. Among recommendations are (1) development of numerical flow and solute transport models for the natural (i.e. pre-developed) period, (2) analysis of groundwater for isotopic composition and presence of pesticides, CFCs and PPCPs, and (3) use of stochastic approaches to characterize the hydraulic properties of the alluvial sediments. These and other proposed measures are relevant also to other alluvial aquifers which suffer from similar fundamental uncertainties.
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