Current Practice and Future Challenges in Coastal Aquifer Management: Flux-Based and Trigger-Level Approaches with Application to an Australian Case Study |
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Authors: | Adrian D Werner Darren W Alcoe Carlos M Ordens John L Hutson James D Ward Craig T Simmons |
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Affiliation: | (1) School of Chemistry, Physics and Earth Sciences, Flinders University, GPO Box 2100, Adelaide, SA, 5001, Australia |
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Abstract: | The control of groundwater abstraction from coastal aquifers is typically aimed at minimizing the risk of seawater intrusion,
excessive storage depletion and adverse impacts on groundwater-dependent ecosystems. Published approaches to the operational
management of groundwater abstraction from regulated coastal aquifers comprise elements of “trigger-level management” and
“flux-based management”. Trigger-level management relies on measured groundwater levels, groundwater salinities and/or ecosystem
health indicators, which are compared to objective values (trigger levels), thereby invoking management responses (e.g. pumping
cut-backs). Flux-based management apportions groundwater abstraction rates based on estimates of aquifer recharge and discharge
(including environmental water requirements). This paper offers a critical evaluation of coastal aquifer management paradigms
using published coastal aquifer case studies combined with a simple evaluation of the Uley South coastal aquifer, South Australia.
There is evidence that trigger-level management offers advantages over flux-based approaches through the evaluation of real-time
resource conditions and trends, allowing for management responses aimed at protecting against water quality deterioration
and excessive storage depletion. However, flux-based approaches are critical for planning purposes, and are required to predict
aquifer responses to climatic and pumping stresses. A simplified modelling analysis of the Uley South basin responses to different
management strategies demonstrates the advantages of considering a hybrid management approach that includes both trigger-level
and flux-based controls. It is recommended that where possible, trigger-level and flux-based approaches be adopted conjunctively
to minimize the risk of coastal groundwater degradation and to underpin strategies for future aquifer management and well-field
operation. |
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