Journal
ADVANCES IN WATER RESOURCES
Volume 32, Issue 9, Pages 1373-1385Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.advwatres.2009.06.001
Keywords
Evolutionary algorithms; Inverse problems; Parallel simulation-optimization framework; Groundwater source identification problem; High performance computing
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Funding
- National Science Foundation (NSF) [BES-0238623, BES-0312841]
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Groundwater characterization involves the resolution of unknown system characteristics from observation data, and is often classified as an inverse problem. Inverse problems are difficult to solve due to natural ill-posedness and computational intractability. Here we adopt the use of a simulation-optimization approach that couples a numerical pollutant-transport simulation model with evolutionary search algorithms for solution of the inverse problem. In this approach, the numerical transport model is solved iteratively during the evolutionary search. This process can be computationally intensive since several hundreds to thousands of forward model evaluations are typically required for solution. Given the potential computational intractability of such a simulation-optimization approach, parallel computation is employed to ease and enable the solution of such problems. In this paper, several variations of a ground-water source identification problem is examined in terms of solution quality and computational performance. The computational experiments were performed on the TeraGrid cluster available at the National Center for Supercomputing Applications. The results demonstrate the performance of the parallel simulation-optimization approach in terms of solution quality and computational performance. (C) 2009 Elsevier Ltd. All rights reserved.
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