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Analisis Intrusi Air Laut Menggunakan Data Resistivitas dan Geokimia Air Tanah di dataran Aluvial Kota Semarang 551,9
INTISARI
Dataran aluvial Kota Semarang merupakan wilayah yang telah terintrusi air
laut, sehingga berdampak langsung pada kualitas airtanah. Kualitas airtanah selain
dipicu oleh faktor penurunan muka airtanah akibat eksploitasi airtanah, juga oleh
faktor kondisi litologi dan akuifer. Tujuan penelitian adalah untuk mengetahui nilai
resistivitas batuan, nilai kualitas airtanah, dan menganalisis persebaran daerah yang
diduga terintrusi air laut. Pengukuran resistivitas dilakukan pada bentangan 50 m
menggunakan konfigurasi Schlumberger. Hasil pengolahan data menggunakan
perangkat lunak Progress 3.0 berupa nilai resistivitas dikorelasi menggunakan nilai
pengujian kualitas airtanah parameter salinitas, Daya Hantar Listrik, oksigen
terlarut, dan pH. Berdasarkan data resistivitas dan geokimia airtanah didapatkan
persebaran daerah yang diduga terintrusi air laut, yaitu pada kelurahan Trimulyo
dengan nilai resistivitas mencapai 0,27 Ωm indikasi air asin dan nilai kualitas
airtanah parameter teruji, yaitu salinitas 3.600 mg/L, Daya Hantar Listrik
6.370 μS/cm, oksigen terlarut 0,8 ppm, dan pH 7,7.
Kata kunci : Intrusi air laut, resistivitas, geokimia airtanah
ABSTRACT
Semarang lowland-alluvial area is in the state of salt water intrusion, that
has a direct impact to the groundwater quality. Groundwater quality is not only
triggered by water level decreasing factors due to the groundwater exploitation,but
also by the factor of lithology and aquifer condition. The purpose of this research
is to know the resistivity rocks value, the value of groundwater quality, and to
analyze the distribution of the estimated area that has been instuited by salt water.
The measured of resistivity is about 50 m expanse using Schlumberger
configuration. The result of processed data with Progress 3.0 is in the form of
resistivity value which is correlated with groundwater quality testing value with
salinity, electrical conductivity, dissolved oxygen, and pH parameters. Based on
the geo-resistivity and groundwater geochemical data shows that there is intrusion
salt water distribution area which occur in Trimulyo area with the resistivity value
of 0,27 Ωm as the indicator of salinity and groundwater quality value parameters
which show the salinity value of 3.600 mg/L, electrical conductivity of 6.370 μS/cm,
dissolved oxygen of 0,8 ppm, and pH 7,7.
Key words : Salt water intrusion, geo-resistivity, groundwater geochemical.
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