Identifikasi Zona Air Asin di Daerah Surabaya Timur Menggunakan Metode Tahanan Jenis dan IP

Alhasan, Azriel Aziz Fiilliyatinnuriz (2023) Identifikasi Zona Air Asin di Daerah Surabaya Timur Menggunakan Metode Tahanan Jenis dan IP. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kota Surabaya merupakan ibukota provinsi di Jawa Timur yang berbatasan langsung dengan laut disebelah timur dan utara. Oleh karena itu, Kota Surabaya sangat rentan mengalami pencemaran air tanah yang disebabkan oleh zona air asin melihat dari jumlah penduduknya yang cukup banyak sehingga pemanfaatan air tanah menjadi berlebihan. Karena hal ini maka diperlukan suatu identifikasi persebaran zona air asin untuk mengetahui daerah mana saja yang telah mengalami pencemaran air tanah. Identifikasi zona air asin dapat dilakukan dengan uji parameter air tanah serta pengukuran geolistrik metode tahanan jenis dan induced polarization. Titik sumur yang disurvey berjumlah sebanyak 40 titik di daerah Surabaya Timur, Parameter air yang diuji berupa pH dan TDS (Total Dissolve Solid). Data parameter air tanah kemudian diolah untuk mendapatkan peta kontur parameter air tanah yang menunjukkan daerah paling rentan terdapat zona air asin. Lalu, untuk mengetahui kedalaman, lapisan dan persebaran zona air asin dilakukan dengan pengukuran metode geofisika resistivitas dan IP (induced polarization) yang dikorelasikan. Hasil pengukuran metode geofisika menunjukkan nilai tahanan jenis untuk air asin di bawah 2,5 Ωm dengan nilai chargeability di atas 45 msec. Litologi yang didapati berupa lempung berlanau dengan salinitas pori tinggi. Kemudian dilakukan permodelan 3 dimensi pada penampang tahanan jenis dan IP sehingga didapati bahwa kedalaman air asin berkisar dari 6-9 meter di bawah permukaan dan tersebar di seluruh area lintasan geolistrik
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Surabaya is the provincial capital of East Java, bordering the sea to the east and north. Therefore, Surabaya is highly vulnerable to groundwater pollution caused by saline water intrusion, given its large population and excessive groundwater utilization. Due to this, it is necessary to identify the distribution of saline water zones to determine which areas have experienced groundwater contamination. The identification of saline water zones can be done through groundwater parameter testing and geoelectric measurements using resistivity and induced polarization methods. A total of 40 well points were surveyed in the eastern part of Surabaya. The tested groundwater parameters included pH and Total Dissolved Solids (TDS). The groundwater parameter data was then processed to obtain a contour map of groundwater parameters, indicating the most vulnerable areas with saline water zones. To determine the depth, layers, and distribution of the saline water zones, resistivity and induced polarization geophysical measurements were carried out and correlated. The geophysical measurement results showed a resistivity value for saline water below 2.5 Ωm with a chargeability value above 45 msec. The lithology encountered was clay with high pore salinity. A 3-dimensional modeling of the resistivity and induced polarization sections was conducted, revealing that the depth of the saline water ranged from 6 to 9 meters below the surface and was distributed throughout the entire geoelectric traverse area

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Resistivitas, Induced Polarization, Air Asin, Resistivity, Induced Polarization, Saline Water
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB1003.2 Groundwater.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Azriel Aziz Fiilliyatinnuriz Alhasan
Date Deposited:	10 Aug 2023 07:49
Last Modified:	10 Aug 2023 07:49
URI:	http://repository.its.ac.id/id/eprint/104129

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