RUKMANA, BANTAR TYAS SUKMAWATI (2019) ANALISIS PERBANDINGAN METODE GOD DAN DRASTIC PADA KERENTANAN AIR TANAH PT. ADARO INDONESIA. Masters thesis, Universitas Pembangunan Nasional Veteran Yogyakarta.
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Abstract
Coal mining is an activity that can cause changes in land use, morphology, geology, and hydrogeology. These changes have an impact on topographic changes, subsurface rock layers, and aquifers. Changes in land use affect the potential for water catchment which will have an impact on the availability of groundwater both in quantity and quality. One of the efforts in maintaining groundwater potential and quality is by conducting groundwater vulnerability analysis. The purpose of this study is to analyze groundwater vulnerability using GOD and DRASTIC methods and to compare groundwater vulnerability of the two methods. The benefits of this research are as a consideration for companies in the management and protection of groundwater. This research was conducted at the Pit Paringin of PT. Adaro Indonesia is located in Balangan Regency, South Kalimantan Province. This study uses the GOD and DRASTIC methods in analyzing groundwater vulnerability. The GOD method is influenced by three parameters namely the type of aquifer, lithology above the aquifer, and the depth to groundwater. The DRASTIC method is influenced by seven parameters namely depth to groundwater, rainfall, aquifer media, soil media, topography, unsaturated zone effects, and hydraulic conductivity. Based on the calculation of groundwater vulnerability index using the GOD method produces two levels of vulnerability, namely negligible (negligible or very low) and moderate (moderate). Groundwater vulnerability zones are very low in the north, south and southeast of the Pit Paringin, while medium ground water vulnerability zones are scattered in the southwest and west to the east of the Pit Paringin. Based on the calculation of groundwater vulnerability index using the DRASTIC method produces three levels of vulnerability, namely very low, low, and moderate. Areas that have very low groundwater vulnerability are located south of the Pit Paringin with a very small area. Areas that have low groundwater vulnerability are spread evenly throughout the Pit Paringin. Areas that have groundwater vulnerability are being spread to the southwest, west, central, east, and northeast of the Pit Paringin with a small area. The correlation coefficient between the DRASTIC index and the Fe parameter is 75%, while the correlation coefficient between the GOD index and the Fe parameter is 49.7%. The correlation coefficient between the DRASTIC index and the Mn parameter is 75.6%, while the correlation coefficient between the GOD index and the Mn parameter is 66.5%. The correlation coefficient between the DRASTIC index and TSS parameters is 71.5%, while the correlation coefficient between the GOD index and TSS parameters is 68.4%. The correlation coefficient between the DRASTIC index and the pH parameter is 57.3%, while the correlation coefficient between the GOD index and the pH parameter is 27.5%. The results of the analysis of the regression method between the parameters of iron (Fe), manganese (Mn), suspended residue (TSS), and pH with groundwater susceptibility index both methods show that the DRASTIC method is more accurate than the GOD method. Keywords: DRASTIC, GOD, Groundwater vulnerability
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | S.IP NURUL ALIFAH RAHMAWATI |
| Date Deposited: | 12 Aug 2019 06:37 |
| Last Modified: | 12 Aug 2019 06:46 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/20711 |
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