Pemodelan Akuifer Air Tanah Menggunakan Geolistrik Resistivitas Vertical Electrical Sounding (VES) Di Kabupaten Sorong, Provinsi Papua Barat

Muzakki, Yusril (2021) Pemodelan Akuifer Air Tanah Menggunakan Geolistrik Resistivitas Vertical Electrical Sounding (VES) Di Kabupaten Sorong, Provinsi Papua Barat. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kawasan Ekonomi Khusus (KEK) Sorong merupakan kawasan yang dipersiapkan untuk memaksimalkan kegiatan industri, ekspor, impor, dan kegiatan ekonomi lain yang memiliki nilai ekonomi tinggi di Kabupaten Sorong. Pemenuhan kebutuhan energi listrik di kawasan KEK Sorong dilakukan dengan cara pembangunan PLTU. Latar belakang penelitian ini adalah adanya kebutuhan sumber daya air tanah area pembangunan PLTU di Kawasan Ekonomi Khusus (KEK) Kabupaten Sorong. Penelitian ini bertujuan untuk mengidentifikasi sifat batuan terhadap air, selain itu untuk mengidentifikasi jenis akuifer dan karateristik akuifer berupa kedalaman dan ketebalan akuifer serta arah aliran air tanah di area penelitian. Metode geolistrik merupakan metode geofisika untuk mengetahui struktur batuan dengan menggunakan sifat kelistrikan bumi. Metode geolistrik yang digunakan yaitu metode geolistik VES, metode ini merupakan metode geolistrik 1-D yang dapat melihat perubahan nilai resisistivitas semu pada satu titik. Konfigurasi yang digunakan yaitu konfigurasi Schlumberger. Hasil dari interpretasi VES dimodelkan 3D menggunakan metode gridding Inverse Distance Weighting (IDW) untuk mengetahui bentuk akuifer. Titik pengukuran yang digunakan sebanyak 7 titik, masing-masing titik memiliki panjang lintasan 400m. Hasil penelitian menunjukkan 2 lapisan akuiklud pada kedalaman 8,5-41 m dan 110,9-132 m yang memiliki litologi batu lempung, serta 2 lapisan akuifer yang memiliki litologi batu pasir. 2 jenis akuifer yang berada di daerah penelitian, yang pertama akuifer bebas dengan litologi berupa batu pasir dengan kedalaman 0,32-8,54 m dan ketebalan 8,22 m. Akuifer bebas di indikasikan berisi air asin dari intrusi air laut dengan nilai resistivitas 0,337-0,977 Ohm.m. Akuifer kedua berupa akuifer tertekan dengan litologi batu pasir yang diapit oleh lapisan batu lempung dengan kedalaman 41-110,9 m dan ketebalan 59,9 m. Akuifer tertekan di indikasikan berisi air tawar dengan nilai resistivitas 10,1-10,9 Ohm.m. Dengan arah aliran air tanah diperkirakan dari arah timur ke barat. ===================================================================================================== The Sorong Special Economic Zone (KEK) is an area prepare to maximize industrial activities, exports, imports, and other economic activities that have high economic value in Sorong Regency. Fulfilling the need for electrical energy in the Sorong KEK area is carried out by build a PLTU. The background of this research is the need for groundwater resources in the PLTU development area in the Special Economic Zone (KEK) of Sorong Regency. This study aims to identify the nature of rocks to water, in addition to identifying the types of aquifers and aquifer characteristics in the form of depth and thickness of the aquifer as well as the direction of groundwater flow in the study area. This study uses resistivity geoelectric data and drills data as validation. The geoelectric method is a geophysical method to determine the rock structure using the earth's electrical properties. The geoelectric method used uses the VES technique, this method is a 1-D geoelectric method which can see changes in the apparent resistance value at one point. The configuration used is the Schlumberger configuration. The results of the VES interpretation were modeled in 3D using the Inverse Distance Weighting (IDW) gridding method to determine the shape of the aquifer. The measurement points used are 7 points, each point has a path length of 400m. The results showed 2 layers of aquiclude at a depth of 8.5-41 m and 110.9-132 m which had clay lithology, and 2 aquifer layers that had sandstone lithology. 2 types of aquifers in the study area, the first is free aquifer with lithology in the form of sandstone with a depth of 0.32-8.54 m and a thickness of 8.22 m. The free aquifer is indicated to contain saltwater from seawater intrusion with a resistivity value of 0.337-0.977 Ohm.m. The second aquifer is a confined aquifer with sandstone lithology flanked by layers of clay rock with a depth of 41-110.9 m and a thickness of 59.9 m. Confined aquifers are indicated to contain freshwater with a resistivity value of 10.1-10.9 Ohm.m. The direction of groundwater flow is estimated from east to west.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Groundwater, 3-D Modelling, 1-D Resistivity, Sorong, Air Tanah, Pemodelan 3-D, Resistivitas 1-D, Sorong
Subjects: G Geography. Anthropology. Recreation > GB Physical geography > GB1197.7 Groundwater flow. Reservoirs
Q Science > QC Physics > QC610.3 Electric conductivity
T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials
Divisions: Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Yusril Muzakki
Date Deposited: 07 Mar 2021 20:54
Last Modified: 07 Mar 2021 20:54
URI: https://repository.its.ac.id/id/eprint/83703

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