Pemodelan 3D Sebaran Akuifer Air Tanah Berdasarkan Data Vertical Electrical Sounding (VES) (Studi Kasus : Kecamatan Winongan, Kabupaten Pasuruan)

Maulidina, Alifiah (2020) Pemodelan 3D Sebaran Akuifer Air Tanah Berdasarkan Data Vertical Electrical Sounding (VES) (Studi Kasus : Kecamatan Winongan, Kabupaten Pasuruan). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kecamatan Winongan Kabupaten Pasuruan merupakan salah satu daerah yang memiliki potensi air tanah yang melimpah. Hal ini berdasarkan dari data Dinas Komunikasi dan Informasi setempat yang menyatakan bahwa terdapat 55 dari 471 sumber mata air Kabupaten Pasuruan terletak di Kecamatan Winongan. Banyaknya sumber mata air di Kecamatan Winongan membuat daerah ini memiliki potensi air tanah yang besar, sehingga perlu dilakukan identifikasi sebaran akuifer untuk pengelolaan sumber daya air tanah jangka panjang. Metode yang dapat digunakan untuk menentukan lapisan penyimpan air tanah (akuifer) adalah metode Vertical electrical sounding (VES) Konfigurasi Schlumberger. Metode VES digunakan untuk menduga lapisan bawah permukaan bumi berdasarkan variasi resistivitasnya. Hasil pemrosesan VES dimodelkan 3D untuk menentukan distribusi akuifer. Jumlah titik pengukuran VES sebanyak 35 titik, dengan panjang masing – masing line pengukuran 500 m. Hasil penelitian ini menunjukkan terdapat 4 zona resistivitas yaitu, zona resistivitas sangat rendah, rendah, sedang, dan tinggi. Zona resistivitas sangat rendah merupakan litologi batuan tuf dengan rentang resistivitas 4,11 – 33,3 Ohm.m, zona resistivitas rendah merupakan litologi pasir tufan dengan rentang resistivitas 4,48 – 87 Ohm.m, zona resistivitas sedang merupakan litologi batuan ignimbrit skoria dengan rentang resistivitas 23,3 – 205 Ohm.m, dan zona resistivitas tinggi merupakan litologi batuan lava dan breksi polimik dengan rentang resistivitas 26 – 298 dan 10,4 – 347 Ohm.m. Pada area penelitian, litologi tuf berperan sebagai akuiklud, ignimbrit skoria sebagai akuitar, pasir tufan sebagai akuifer, lava dan breksi polimik sebagai akuifug. Tipe akuifer daerah penelitian adalah akuifer tertekan karena diapit oleh lapisan impermeable. Berdasarkan pemodelan 3Dnya, sebaran akuifer mengarah ke utara dan terakumulasi di titik VES 04. =====================================================================================Winongan is one of the sub-districts in Pasuruan Regency which has groundwater potential. This is based on data from the local Communication and Information Office which states that there are 55 of 471 springs in the Pasuruan Regency located in Winongan District. The many springs in Winongan Subdistrict make this area has great groundwater potential, so it is necessary to identify the distribution of aquifers for long-term management of groundwater resource. The method that can be used to determine aquifer is the Vertical electrical sounding (VES) Schlumberger configuration. The VES method is used to estimate subsurface layers based on variations resistivity. VES processing results are 3D modeled to determine the distribution of aquifers. The number of VES measurement points is 35 points, with the length of each measurement line being 500 m. As result, this research found that 4 resistivity zones, which are very low, low, medium, and high resistivity zone. The very low resistivity zone is a tuff rock with a resistivity range of 4.11 - 33.3 Ohm.m, the low resistivity zone is a tuff sand rock with a resistivity range of 4.48 - 87 Ohm.m, the medium resistivity zone is a ignimbrit score with the resistivity range is 23.3 - 205 Ohm.m, and the high resistivity zone is lava rock and polymic breccias with resistivity ranges 26 - 298 and 10.4 - 347 Ohm.m. In the research area tuff lithology acts as aquiklud, ignimbrit Skoria as aquitar, tuff sand as aquifer, lava and polymic breccia as aquifug. The type of aquifer of the research area is a confined aquifer because it is between the impermeable layersr. Based on 3D modeling, the distribution of aquifer spreads northward and accumulates at VES 04.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Akuifer, Vertical electrical sounding (VES), Inverse distance weighting, Pemodelan 3D, Aquifer, Vertical electrical sounding (VES), Inverse distance weighting, 3D Modelling.
Subjects: G Geography. Anthropology. Recreation > GB Physical geography > GB1197.7 Groundwater flow. Reservoirs
T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Alifiah Maulidina
Date Deposited: 25 Aug 2020 04:18
Last Modified: 25 Aug 2020 04:18
URI: http://repository.its.ac.id/id/eprint/79726

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