Rochmah, Khusnul Nur (2025) Evaluasi Potensi Air Tanah Menggunakan Metode APLIS dan Modified-APLIS dengan Karakterisasi Bawah Permukaan di Daerah Karst Pringkuku Pacitan. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Air tanah di daerah karst berpotensi untuk mendukung suplai air ketika musim kemarau, terutama di Kecamatan Pringkuku, Pacitan yang termasuk daerah dengan kekeringan terparah pada setiap tahunnya. Kawasan karst Pacitan memiliki karakteristik hidrogeologi yang kompleks dimana air tanah karst sulit diprediksi akibat proses pelarutan batuan karbonat menciptakan rongga-rongga dan sistem aliran air tanah yang unik namun sulit diprediksi. Studi dan pengelolaan karst menjadi penting karena daerah karst memiliki potensi air tanah yang tersimpan dalam akuifer karst. Untuk mengoptimalkan pemanfaatan dan pengelolaan air tanah, estimasi imbuhan air tanah penting diketahui. Penelitian ini bertujuan untuk mengevaluasi potensi air tanah di karst Pringkuku Pacitan menggunakan indeks APLIS dan Modified-APLIS, serta metode VLF-EM. Dilakukan klasifikasi untuk mengetahui area potensial air tanah dengan menggunakan beberapa parameter geohidrogeologi yang memengaruhi imbuhan air tanah termasuk ketinggian (A), kemiringan lereng (P), litologi (L), zona infiltrasi (I), dan jenis tanah (S). Setelah mengintegrasikan semua data, laju imbuhan air tanah diperkirakan. Metode geofisika Very Low Frequency-Electromagnetic (VLF-EM) diterapkan untuk mengetahui kondisi bawah permukaan di karst Pringkuku. Metode VLF-EM digunakan untuk identifikasi bawah permukaan yaitu struktur geologi seperti patahan dan rekahan batuan yang berkaitan dengan air tanah karst. Hasil penelitian menunjukkan laju imbuhan air tanah yang diperkirakan oleh metode APLIS minimum, maksimum, dan rata-rata akuifer adalah 13.3%, 80%, dan 49.02%, sedangkan Modified APLIS menghasilkan laju imbuhan air minimum 1%, maksimum 80% dengan nilai tahunan rata-rata 45.73%. Pemetaan zona potensi air tanah di kawasan karst Pringkuku terbagi menjadi zona potensi air tanah sangat rendah, rendah, sedang, dan tinggi. Wilayah penelitian didominasi oleh zona potensi air tanah tinggi yang terletak pada wilayah bagian selatan-barat Pringkuku. Hasil ini didukung oleh hasil VLF-EM yang menunjukkan pada wilayah tersebut tersusun atas batugamping dengan resistivitas rendah (0-500 Ωm). Batugamping dicirikan dengan rongga-rongga batuan dan permebalitas yang tinggi, sehingga dapat mengalirkan air lebih mudah. Metode VLF-EM berhasil mengidentifikasi patahan yang umumnya dapat bertindak sebagai jalur aliran air menuju ke bawah permukaan
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Groundwater in karst areas has the potential to support water supply during the dry season, especially in Pringkuku District, Pacitan, which is one of the areas with the worst drought every year. The Pacitan karst area has complex hydrogeological characteristics, where karst groundwater is challenging to predict due to the dissolution process of carbonate rocks, which creates cavities and unique yet unpredictable groundwater flow systems. Karst studies and management are important because karst areas have groundwater potential stored in karst aquifers. To optimize groundwater utilization and management, estimating groundwater recharge is important. This study aims to evaluate the groundwater potential in the Pringkuku Pacitan karst using the APLIS and Modified-APLIS indices, as well as the VLF-EM method. Classification is carried out to determine the potential groundwater area using several geohydrogeological parameters that affect groundwater recharge, including altitude (A), slope gradient (P), lithology (L), infiltration zone (I), and soil type (S). After integrating all data, the groundwater recharge rate is estimated. The Very Low Frequency-Electromagnetic (VLF-EM) geophysical method was applied to determine the subsurface conditions in the Pringkuku karst. The VLF-EM method is used to identify subsurface geological structures, such as rock faults and fractures, related to karst groundwater. The results showed that the groundwater recharge rate estimated by the APLIS method was a minimum, maximum, and average aquifer of 13.3%, 80%, and 49.02%, while the Modified APLIS method produced a minimum water recharge rate of 1%, a maximum of 80% with an average annual value of 45.73%. The mapping of groundwater potential zones in the Pringkuku karst area is divided into four categories: very low, low, medium, and high groundwater potential zones. The study area is dominated by a high groundwater potential zone located in the south-western part of Pringkuku. These results are supported by the VLF-EM results, which show that the area is composed of limestone with low resistivity (0-500 Ωm). Limestone is characterized by cavities and high permeability, allowing water to flow more easily. The VLF-EM method successfully identified faults that can generally act as pathways for water flow to the subsurface..
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Air Tanah, APLIS, M-APLIS, Patahan, VLF-EM; Groundwater, APLIS, M-APLIS, Fault, VLF-EM |
| 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. |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29101-(S2) Master Thesis |
| Depositing User: | Khusnul Nur Rochmah |
| Date Deposited: | 29 Jul 2025 06:45 |
| Last Modified: | 29 Jul 2025 06:45 |
| URI: | http://repository.its.ac.id/id/eprint/122728 |
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