Evaluating Strategies to Manage Seawater Intrusion

by Tracy Nishikawa, (A.M.ASCE),
Eric G. Reichard,

Abstract: A simulation-optimization model has been developed to evaluate strategies for managing seawater intrusion in the Oxnard Plain, Ventura County, California; however, this model addresses only groundwater flow and not the advective dispersive, density-dependent transport of seawater. In this work, the decision rules derived from the simulation-optimization model are evaluated using Monte Carlo analysis and a two-dimensional, density-dependent groundwater flow and transport model. A comparison of simulated chloride mass fractions is made between maintaining 1993 heads for 15 years, maintaining expected year-iS optimal heads for 15 years, and following the decision rules over a range of 15-year sequences of possible surface-water conditions. The results indicate that the simulation-optimization model generally yields strategies whose chloride mass fractions are less than would be expected if the 1993 heads were maintained; however, seawater intrusion is better controlled in the upper aquifer system than in the lower.

Subject Headings: Salt water intrusion | Simulation models | Hydrologic models | Two-dimensional models | Groundwater flow | Flow simulation | Two-dimensional analysis | Density currents | North America | California | Europe | Monaco | United States | Monte Carlo

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