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Sustainable Management of Coastal Aquifers subject to Seawater Intrusion using Reduced-Order Groundwater Flow Models. Presented at EGU General Assembly 2023 Vienna, Austria (23-28 April 2023)

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posted on 2024-03-05, 23:03 authored by Mohammadali GeranmehrMohammadali Geranmehr, Domenico BauDomenico Bau, Alex S. Mayer, Weijiang YuWeijiang Yu

We provide an overview of the challenge of simulating seawater intrusion (SWI) in coastal aquifers with complex hydrogeological conditions using "variable-density" models. These models simulate groundwater flow and the transport of dissolved salt and are valuable in managing groundwater resources in vulnerable coastal systems. However, the application of simulation-optimization (SO) to SWI problems has been hindered by the computational demands of full-scale variable-density models. To address this, the study introduces a surrogate model of SEAWAT, a popular variable-density groundwater flow model, based on the proper orthogonal decomposition (POD) method. The POD method involves mapping coefficient matrices and right-hand side vectors onto a smaller space through finite-difference discretization. Preliminary results indicate that the POD-based surrogate model is significantly faster than the full-scale model while maintaining acceptable accuracy. This makes the surrogate model well-suited for replacing the full-scale variable-density model in the SO framework for managing coastal aquifers.

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CBET-EPSRC Efficient Surrogate Modeling for Sustainable Management of Complex Seawater Intrusion-Impacted Aquifers

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    Department of Civil and Structural Engineering

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