Use of ??8O and ?D to Define Seawater Intrusion

by John A. Izbicki,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


On the basis of previous studies, more than 60 km? of upper aquifer system underlying the Oxnard Plain was believed to be intruded by seawater. Recent work has shown that there are sources of high-chloride water to wells other than seawater. In this study, ?18O and ?D data were used in conjuction with chloride data to identify the source of high-chloride wat to wells and redefine the areal ext of seawater intrusion. On the basis of these data, 14 km of the Oxnard aquifer and 8.5 km? of the Mugu aquifer within the upper aquifer system are intruded by seawater. In some areas, the seawater front is preceded by high-chloride water derived from fine-grained deposits within the Oxnard and Mugu aquifers. In much of the area formerly believed to be intruded by seawater, ground water was found to be fresh.

Subject Headings: Sea water | Chloride | Salt water intrusion | Groundwater quality | Wells (water) | Hydrologic data | Groundwater

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