Assessment of Regional Management Strategies for Controlling Seawater Intrusion
Publication: Journal of Water Resources Planning and Management
Volume 131, Issue 4
Abstract
Simulation-optimization methods, applied with adequate senstivitivity tests, can provide useful quantitative guidance for controlling seawater intrusion. This is demonstrated in an application to the West Coast Basin of coastal Los Angeles that considers two management options for improving hydraulic control of seawater intrusion: increased injection into barrier wells and in lieu delivery of surface water to replace current pumpage. For the base-case optimization analysis, assuming constant groundwater demand, in lieu delivery was determined to be most cost effective. Reduced-cost information from the optimization provided guidance for prioritizing locations for in lieu delivery. Model sensitivity to a suite of hydrologic, economic, and policy factors was tested. Raising the imposed average water-level constraint at the hydraulic-control locations resulted in nonlinear increases in cost. Systematic varying of the relative costs of injection and in lieu water yielded a trade-off curve between relative costs and injection/in lieu amounts. Changing the assumed future scenario to one of increasing pumpage in the adjacent Central Basin caused a small increase in the computed costs of seawater intrusion control. Changing the assumed boundary condition representing interaction with an adjacent basin did not affect the optimization results. Reducing the assumed hydraulic conductivity of the main productive aquifer resulted in a large increase in the model-computed cost.
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Acknowledgments
The writers thank Hedeff Essaid, Jack Eggleston, and the anonymous reviewers for their very helpful reviews. Laurel Rogers and Phil Contreras provided the illustrations. The work presented here is part of a larger project jointly funded by the U.S. Geological Survey and the Water Replenishment District of Southern California. The writers thank their many colleagues who have contributed to this cooperative project
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Information & Authors
Information
Published In
Journal of Water Resources Planning and Management
Volume 131 • Issue 4 • July 2005
Pages: 280 - 291
Copyright
© 2005 ASCE.
History
Received: Mar 23, 2004
Accepted: Jun 2, 2004
Published online: Jul 1, 2005
Published in print: Jul 2005
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