In this research study area is located in Cha-am, Phetchaburi Province, which is one area that has been affected by such problems, the objective of this research was to evaluate the intrusion of seawater into coastal aquifers. This ensures that the incursion into the area which lead to the prevention rehabilitate affected areas efficiently. The survey conducted by means of electrical resistance in the vertical number 80 spot survey covers education. And Article 47 Surveys point to display a cross section with a landscape orientation. West - East direction perpendicular to the coastline of four lines using IPI2WIN in data processing. And explain the chemistry of the sample with analysis of the 57 groundwater wells, the results showed that the encroachment of the sea will occur in sedimentary rocks hillside with an average depth of 50-60 meters and is in the range. trends more deeply when approaching the coast. By electrical resistance <5 Ohm meters of aquifers will reflect the influence of sea water encroachment and high electrical resistance range 5-10 ohm meter to show the influence of moderate sea encroachment. Which were consistent with the results of the chemical analysis of water samples. By grouping its water with Piper diagram. Found that water samples can be classified into five categories and grouped three groups: Ca-Na-HCO3 (those who were not influenced by the sea), Ca-Na-HCO3-Cl, Ca-HCO3-Cl and Ca-. Na-Cl (the group has little influence of the sea) and Na-Cl group that has influenced a lot of water. And found that the group receiving the higher will be the influence of sea water of high conductivity as well. When all the results were analyzed together. The area has been opposing the display of the low electrical conductivity of the water. And what kind of a Na-Cl water, which is found in the upper part of the study area will experience a complication of the sea than other areas are. From coast to a distance of eight kilometers.
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