Pemetaan Aliran Sungai Bawah Tanah Di Daerah Rengel-Tuban Dengan Menggunakan Metode Very Low Frequency- Electromagnetic (VLF-EM)

Wijayanti, Normasari (2017) Pemetaan Aliran Sungai Bawah Tanah Di Daerah Rengel-Tuban Dengan Menggunakan Metode Very Low Frequency- Electromagnetic (VLF-EM). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu kawasan karst di Indonesia terletak pada daerah Rengel–Tuban. Umumnya kawasan karst memiliki kekurangan air bersih, sehingga dibutuhkan metode geofisika untuk mengidentifikasi posisi reservoir air tanah. Salah satu reservoir air tanah pada karst ialah sungai bawah tanah. Metode geofisika yang sesuai adalah metode VLF-EM. Data pengukuran VLF-EM, perlu dilakukan proses filter NA-MEMD untuk memisahkan noise pada data VLF-EM secara simultan (pada data inphase dan quadrature). Setelah itu, dilakukan pengelolahan data yaitu interpretasi kualitatif (filter Fraser dan filter K-Hjelt) dan interpretasi kuantitaif (Inversi). Aliran sungai bawah tanah tiap-tiap lintasan yang teridentifikasi berkolerasi dengan sinkhole dan arah jalur aliran sungai bawah tanah mengarah dari utara menuju selatan. Kedalaman sungai bawah tanah berkisaran 5-20m. ========================================================= ========================================================= One of the karst areas in Indonesia located in RengelTuban. karst region generally lack of clean water. It takes a geophysical method for identify the position of the groundwater reservoir. One of groundwater in karst reservoir is underground river. Geophysical methods that able to identify is VLF-EM method. VLF-EM measurement data needs NA-MEMD filter process to separate the noise in the VLF-EM data simultaneously (data inphase and quadrature). After that, maintaining data with qualitative interpretation (Fraser filter and filter K-Hjelt) and quantitative interpretation (inversion). Every path of underground river that identified correlated with the sinkhole and the direction of the flow path of an underground river leads from north to south. Underground river depth has range 5-20m.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Fraser, K-Hjelt, NA-MEMD,VLF-EM
Subjects: Q Science > QC Physics
Q Science > QE Geology
Divisions: Faculty of Mathematics and Science > Physics > (S1) Undergraduate Theses
Depositing User: NORMASARI NORMASARI WIJAYANTI
Date Deposited: 12 Apr 2017 03:46
Last Modified: 12 Apr 2017 03:46
URI: http://repository.its.ac.id/id/eprint/3439

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