Nitura, Bahtiar (2020) Pemodelan 2D Metode Inversi Robust Constraint Data Geolistrik Konfigurasi Wenner-schlumberger di Mata air Umbulan Kec. Winongan, Pasuruan. Undergraduate thesis, “Institut Teknologi Sepuluh Nopember.
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BAHTIAR NITURA_03411640000067_Pemodelan 2D Metode Inversi Robust Constraint Data Geolistrik Konfigurasi Wenner-Sclumberger Di Mata Air Umbulan Kec. Winongan, Pasuruan.pdf - Accepted Version Restricted to Repository staff only Download (3MB) | Request a copy |
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Surat Permohonan-03411640000067.pdf - Accepted Version Restricted to Repository staff only Download (112kB) | Request a copy |
Abstract
Metode geolistrik merupakan salah satu metode geofisika untuk mengetahui struktur bawah permukaan bumi dengan sifat kelistrikan. Data hasil pengukuran harus dilkakukan inversi untuk mendapatkan nilai resistivitas batuan yang sebenarnya. Salah satu metode inversi adalah robust constraint, Inversi ini dipilih karena dapat mengatur ketajaman model yang dihasilkan dan juga mempunyai hasil lebih akurat dan konstan. Parameter yang diatur yaitu Rd dan Rm. Nilai Rd merupakan nilai pembobotan yang diberikan untuk mengurangi resistivitas semu pengukuran dengan resistivitas semu perhitungan, dan nilai Rm merupakan nilai pembobotan yang diberikan untuk model awal. Berdasarkan hasil penelitian semakin kecil nilai Rd dan Rm maka abs error yang dihasilkan semakin kecil, nilai Rm mempengaruhi batas antar lapisan yang dihasilkan. Hasil inversi menggunakan robust constraint di sekitar Mata air Umbulan memiliki 3 lapisan yaitu, nilai resistivitas rendah 7-50 ohm.m penyusun berupa tanah lapukan dan lapili tuf, nilai resistivitas sedang 50-200 ohm.m penyusun berupa tuff, ketiga nilai resistivitas tinggi >200 ohm.m sebagai lava.
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Geo-electric method is one of the geophysical methods to determine subsurface structures with electrical properties. The measurement data must be inversed to get the actual rock resistivity value. One of the inversion methods is robust constraint, this inversion was chosen because it can adjust the sharpness of the resulting model and also has more accurate and constant results. The parameters set are Rd and Rm. The value of Rd is the weighted value given to reduce the apparent resistivity of the measurement with the apparent resistivity of the calculation, and the value of Rm is the weighted value given to the initial model. Based on the results of the study the smaller the value of Rd and Rm, the smaller abs error generated. The Rm values affected the boundaries between the resulting layers. Based on the results of the robust constraint inversion, Umbulan springs have 3 layers of resistivity values with 7-50 ohm.m. was weathered land and tuff lapili, resistivity values are 50-150 ohm.m. was tuff, high resistivity value >200 ohm.m as lav
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Geolistrik, Mata air Umbulan, Robust constraint |
| Subjects: | T Technology > TD Environmental technology. Sanitary engineering > TD395 Reservoirs (water supply) |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering |
| Depositing User: | Bahtiar Nitura |
| Date Deposited: | 10 Aug 2020 06:13 |
| Last Modified: | 25 Aug 2020 09:52 |
| URI: | http://repository.its.ac.id/id/eprint/77346 |
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