Farras, Muhammad Abiyyu (2019) Aplikasi Metode Geolistrik Tahanan Jenis Konfigurasi Dipol-dipol dalam Pendugaan Penyebaran Intrusi Air Laut (Studi Kasus Daerah Dusun Bajulmati, Desa Gajahrejo, Kec. Gedangan, Kabupaten Malang). Sarjana thesis, Universitas Brawijaya.
Abstract
Perkembangan pariwisata, industri, perusahaan, perdagangan, pertanian dan pertambahan jumlah penduduk di Dusun Bajulmati semakin meningkat sehingga mengakibatkan ketidakseimbangan siklus air tanah yang memicu turunnya permukaan air tanah dan menyebakan intrusi. Berdasarkan gambaran tersebut maka perlu penelitian dengan tujuan untuk mengetahui gambaran struktur bawah permukaan dan pendugaan intrusi air laut di daerah penelitian melalui interpretasi profil anomali penampang tahanan jenis. Pengukuran atau akuisisi data dilakukan di Dusun Bajulmati dengan mengumpulkan sampel air sumur warga secara acak dan akuisisi pada 6 lintasan menggunakan metode geolistrik konfigurasi dipol-dipol, dengan spasi elektroda 10 m dan panjang lintasan bervariasi mulai 140 m hingga 300 m. Air sumur yang diperoleh diuji salinitasnya dan data Resistansi yang diperoleh lalu inversi dengan software Res2DInv menghasilkan penampang tahanan jenis dua dimensi. Hasil inversi lalu direpresentasikan dalam model model tiga dimensi. Hasil inversi diperoleh nilai resistivitas dengan rentang 0,2 Ωm hingga 1806,25 Ωm dengan Daerah Terdampak Intrusi (0,2-4 Ωm), Lapisan Batuan Lempung Berpasir (4-30 Ωm), Lapisan Batuan Lempung (30-200 Ωm), dan Lapisan Batu Gamping (200-1806,25 Ωm). Ditemukan adanya daerah terdampak intrusi pada Lintasan A, B, dan C diduga berasa dari pantai dan sungai. Intrusi air laut di Dusun Bajulmati dipicu pergerakan air laut dan turunnya muka air tanah sehingga air laut dapat masuk ke lapisan permeable dan mengkontaminasi air tanah, jarak dan ketinggian dusun yang menjadi faktor pendukung lain terjadinya intrusi.
English Abstract
The development of tourism, industry, companies, trade, agriculture and population growth in Bajulmati are increasing, resulting in an imbalance in the groundwater cycle which triggers the decline in groundwater levels and causes intrusion. Based on this description, it is necessary to study which aims to determine the description of subsurface structures and the estimation of seawater intrusion in the study area through the interpretation of anomalous profile section. Measurement or data acquisition was carried out in Bajulmati, first by randomly collecting residents well water samples and secondly, acquisition on 6 tracks using dipole-dipole configuration of resistivity method, with 10 m of electrode spacing and line lengths ranging from 140 m to 300 m. The well water obtained was tested for its salinity and the resistance data obtained then inversion with Res2DInv software which resulting a cross section of the two-dimensional type of resistance. The inversion results are then represented in a three dimensional model. The inversion results obtained resistivity values in the range of 0,2 Ωm to 1806,25 Ωm with Intrusion Affected Areas (0,2-4 Ωm), Sandy Sand Layers (4-30 Ωm), Clay Layers (30-200 Ωm), and Limestone Layers (200-1806,25Ωm). It was found that areas affected by intrusion on lines A, B, and C were thought to be from the coast and rivers. Sea water intrusion in the Bajulmati was triggered by the movement of sea water and the decline in ground water level so that sea water can enter the permeable layer and contaminate ground water, distance and height of the sub-village which are other supporting factors of the intrusion.
Other obstract
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| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/MIPA/2019/240/051911020 |
| Uncontrolled Keywords: | Dusun Bajulmati, Intrusi Air Laut, Resistivitas, Konfigurasi Dipol-dipol, Bajulmati, Sea Water Intrusion, Resistivity, Dipole-Dipole Configuration |
| Subjects: | 500 Natural sciences and mathematics > 537 Electricity and electronics |
| Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Fisika |
| Depositing User: | Budi Wahyono Wahyono |
| Date Deposited: | 10 Aug 2020 08:11 |
| Last Modified: | 20 Feb 2023 03:34 |
| URI: | http://repository.ub.ac.id/id/eprint/179542 |
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