Kajian Intrusi Air Laut pada Sumur Dangkal di Desa Denai Kuala Kecamatan Pantai Labu Kabupaten Deli Serdang

Abstract

The increasing of population in the coastal area affects in exploitation of ground water too. Shallow well one of the media be used to fulfill the needs of water. The location of ground water that closed to coastal area, caused the sea water intrution and then shallow well water changed into salty and brackish. The aim of this research is to analyze the salinity containing in shallow well water and to know the overview of distribution of salinity on the shallow well water. This research was done in Denai Kuala village district of Pantai Labu, Deli Serdang on Mei-June 2015. The sample in shallow well was taken randomly so can be got 80 samples of shallow well water spread in four hamlets. This research uses the software Arc GIS 9.3 to obtain a map of the spread of salinity. The results showed that the salinity of the shallow well water in the Denai Kuala village varied. Number of shallow wells at hamlet 1 is 0 mg/l ( category fresh water), at hamlet 2 is 3200 mg/l ( category brackish water), at hamlet 3 is 0 mg/l (category fresh water), and at hamlet 4 is 1400 mg/l (category brackish water). The map of the spread salinity show the biggest of sea water intrusion on the hamlet 2 and hamlet 4, while on the hamlet 1 and hamlet 3 have not been affected by seawater intrusion.