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Stratigraphic controls on seawater intrusion and implications for groundwater management, Dominguez Gap area of Los Angeles, California, USA |
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| Authors: | Tracy Nishikawa A J Siade E G Reichard D J Ponti A G Canales T A Johnson |
| Institution: | 1. United States Geological Survey, 4165 Spruance Rd., Suite 200, San Diego, CA, 92101, USA 2. United States Geological Survey, 345 Middlefield Rd., M.S. 977, Menlo Park, CA, 94025, USA 3. Instituto Tecnologico de Sonora, 5 de Febrero 818 Sur, Obregon, Sonora, 85000, Mexico 4. Water Replenishment District of Southern California, 4040 Paramount Boulevard, Lakewood, CA, 90712, USA |
| Abstract: | Groundwater pumping has led to extensive water-level declines and seawater intrusion in coastal Los Angeles, California (USA). A SUTRA-based solute-transport model was developed to test the hydraulic implications of a sequence-stratigraphic model of the Dominguez Gap area and to assess the effects of water-management scenarios. The model is two-dimensional, vertical and follows an approximate flow line extending from the Pacific Ocean through the Dominguez Gap area. Results indicate that a newly identified fault system can provide a pathway for transport of seawater and that a stratigraphic boundary located between the Bent Spring and Upper Wilmington sequences may control the vertical movement of seawater. Three 50-year water-management scenarios were considered: (1) no change in water-management practices; (2) installation of a slurry wall; and (3) raising inland water levels to 7.6 m above sea level. Scenario 3 was the most effective by reversing seawater intrusion. The effects of an instantaneous 1-m sea-level rise were also tested using water-management scenarios 1 and 3. Results from two 100-year simulations indicate that a 1-m sea-level rise may accelerate seawater intrusion for scenario 1; however, scenario 3 remains effective for controlling seawater intrusion. |
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