Hardyani, Putry Vibry (2021) Evaluasi Potensi Akuifer Air Tanah di Kawasan Karst Donorojo, Pacitan Menggunakan Metode APLIS dan Geolistrik VES. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Akuifer karst dapat menjadi sumber penyedia kebutuhan air terutama bagi masyarakat di kawasan karst Kecamatan Donorojo yang merupakan salah satu daerah krisis air di Kabupaten Pacitan. Namun, studi tentang potensi dan pengelolaan akuifer airtanah di kawasan karst tersebut masih terbatas, padahal hal ini penting sebagai salah satu dasar pengembangan kawasan karst yang berkelanjutan. Oleh karena itu, penelitian ini bertujuan untuk mengevaluasi potensi akuifer airtanah di kawasan karst Donorojo, Pacitan dengan menggunakan metode APLIS dan Geolistrik VES (Vertical Electrical Sounding). Metode APLIS menggunakan 5 parameter intrinsik yaitu ketinggian (Altitude), kemiringan lereng (Slope), litologi (Lithology), zona infiltrasi (Infiltration), dan tanah (Soil). Paramater tersebut kemudian diberi skor dan dibobot untuk mendapatkan distribusi atau zona potensi airtanah dengan memanfaatkan Sistem Informasi Geografis (SIG). Sedangkan metode Geolistrik VES pada penelitian ini digunakan untuk menganalisis potensi akuifer airtanah di bawah permukaan bumi ditinjau dari nilai resistivitas. Pengukuran dilakukan dengan menggunakan konfigurasi Schlumberger sebanyak 25 titik pengukuran pada area seluas ±124,65 km2 dengan panjang lintasan 250 s.d 600 meter. Hasil dari analisis pada penelitian ini menunjukkan zona potensi airtanah di wilayah studi menggambarkan empat zona berbeda yang meliputi tinggi (104,809 km2), sedang (0,712 km2), rendah (17,653 km2) dan sangat rendah (1,483 km2). Potensi akuifer airtanah secara umum ditemukan pada kedalaman <10 meter dan >50 meter yang tersusun atas Batugamping dan Batugamping konglomerat dengan range nilai resistivitas antara 30 s.d 170 Ohm.m. Nilai resistivitas batuan karbonat yang cukup rendah menunjukkan bahwa proses karstifikasi berkembang dengan baik, membentuk sistem akuifer karst tidak terbatas dan didominasi oleh lorong-lorong yang membentuk jaringan conduit. Validasi dilakukan dengan membandingkan hasil beberapa titik Geolistrik VES dengan hasil Geolistrik 2D dari penelitian terdahulu dan ditemukan potensi akuifer airtanah pada kedalaman yang sama. Akan tetapi, untuk pengembangan dan pemanfaatan lebih lanjut disarankan menggunakan data bor untuk menguji potensi akuifer airtanah tersebut secara lebih akurat.
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Karst aquifers can be a source of water, especially for community in the karst area of Donorojo District, which is one of Pacitan Regency's water crisis areas. However, study on the potential and management of karst groundwater aquifers is still limited, despite the fact that this is an important foundation for the development of a sustainable karst area. As a result, the goal of this study is to use APLIS and VES (Vertical Electrical Sounding) Geoelectrical methods to assess the potential of groundwater aquifers in the Donorojo karst area of Pacitan. Altitude, Slope, Lithology, infiltration zone, and Soil are the five intrinsic parameters used by the APLIS method. Using a Geographic Information System (GIS), these parameters are then scored and weighted to obtain the distribution or zone of groundwater potential. Meanwhile, the VES Geoelectrical method was used in this study to analyze of potential groundwater aquifers beneath the earth's surface based on resistivity value. As many as 25 measurement points were made using the Schlumberger configuration in an area of 124.65 km2 with a track length of 250 to 600 meters. According to the results of this study, the groundwater potential zone in the study area is divided into four zones: high (104.809 km2), medium (0.712 km2), low (17.653 km2), and very low (1,483 km2). Potential groundwater aquifers are composed of limestone and conglomerate limestone with resistivity values ranging from 30 to 170 Ohm.m and are found at depths of 10 to 50 meters. Because carbonate rocks have a low resistivity, it is show that the karstification process is well developed, resulting in an Unconfined Karstic Aquifer system dominated by tunnels that form a conduit network. Validation was done by comparing the results of several VES Geoelectrical points with 2D Geoelectrical results from previous studies, which revealed the presence of groundwater aquifers at the same depth. However, for further development and utilization, it is recommended to use drill data to more accurately test the potential of the groundwater aquifer.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Potensi Akuifer, Airtanah, Karst, SIG, Metode APLIS, Geolistrik VES ========================================================================= Aquifer Potential, Karst, GIS, APLIS Method, VES Geoelectrical Method |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G70.212 ArcGIS. Geographic information systems. G Geography. Anthropology. Recreation > G Geography (General) > G70.217 Geospatial data G Geography. Anthropology. Recreation > GB Physical geography > GB1003.2 Groundwater. G Geography. Anthropology. Recreation > GB Physical geography > GB600 Karst conservation. G Geography. Anthropology. Recreation > GE Environmental Sciences |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29101-(S2) Master Thesis |
| Depositing User: | Putry Vibry Hardyani |
| Date Deposited: | 19 Aug 2021 03:43 |
| Last Modified: | 19 Aug 2021 03:43 |
| URI: | http://repository.its.ac.id/id/eprint/87352 |
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