Hydrochemical Indicator Analysis of Seawater Intrusion into Coastal Aquifers of Semiarid Areas

Saltwater intrusion into groundwater systems is a problem worldwide and induced mainly by human activities, such as overexploitation climate change. The coastal Los Planes aquifer in the southern part of Baja California Peninsula (Mexico) affected seawater due to more than 40 years overexploitation. A dataset 55 samples was compiled, including 18 from our campaigns between 2014 2016. Several methods exist define impact aquifer, “seawater fraction”, “Chloro-Alkaline Indices”, “Hydrochemical Facies Evolution Diagram”, “Saltwater Mixing Index”. These provide reasonable results for most zone aquifer. slight increase mineralization observed 2016 compared with situation 2003. However, its northwestern part, hydrothermal wells were not recognized these methods. Here, thermal water elevated mineralization, introduced through El Sargento fault, main which cuts study area north–south direction. By considering known manifestations interpretation, could be classified combination four end-members: fresh groundwater, seawater, composition two types water. One endmember very low coincides described Cabos Block, where meteoric represents source (found Sierra la Laguna). second comparable source. Therefore, higher result mobilization direct mixing locally at coast overextraction. This finding important future management strategies