Interpretasi Filter Fraser dan Karous-Hjelt Pada Data VLF-EM Untuk Mengidentifikasi Air Lindi di Area TPA Ngipik

Khairul Yadi, Dwa Desa Warnana, Juan Pandu G.N.R., Nila Sutra, Ria Asih A. Soemitro
Submission Date: 2017-07-25 20:08:53
Accepted Date: 2018-01-09 21:27:31

Abstract


Telah dilakukan penelitian untuk mendeteksi keberadaan air lindi dengan metode VLF  dimana pengolahan data yang dilakukan menggunakan Filter Fraser dan Karous-Hjlet. Hasil filter Fraser menghasilkan perpotongan grafik Inphase dan Quadrature yang mana anomali dapat dilihat jika grafik tersebut berpotongan pada saat Inphase negatif dan Quadrature positif sedangkan hasil Filter Karous-Hjelt menghasilkan penampang 2 dimensi dengan parameter rapat arus. Dari hasil penelitian diperoleh keberadaan air lindi  ditunjukkan oleh adanya anomali konduktif pada lintasan 1 berada pada posisi 75-125m, 140-160m dan 210-230m, untuk Lintasan 2 berada pada posisi 20-25 m dan 75-135 m, sedangkan  Lintasan 3 berada pada posisi 20-50m, 75-170 m dan 210-250 m. Hasil Filter Fraser dan Karous-Hjelt bisa digunakan untuk mendeteksi keberadaan air lindi yang diinterpretasi secara kualitatif dengan adanya  anomali yang bersifat konduktif, namun hanya bisa melihat anomali secara lateral (horizontal);

Kata Kunci— VLF, Air Lindi, Konduktif


Keywords


VLF, Air Lindi, Konduktif

References


Fraser, D. C. 1969. Contouring of VLF-EM data. Geopghysics, 34: 958-967.

Jeng, Y., Lin, M.-J., Chen, C.-S., Wang, Y.-H., 2—7. Noise Reduction and Data Recovery for a VLF Survey using a nonlinear Decompotition Methode, Geophysics, 5 72, F223-F235.

Karous, M. and Hjelt, S. E. 1983. Linear filtering of VLF Dip-Angle measurements. Geophys. Prospect., 31: 782-794.

Santos, Fernando A.M. at al. 2006. Mapping groundwater contamination around a landfill facility using the VLF-EM method-A case study. Centro de Geofisika da Universidade Lisboa. Lisbon.


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