ESTIMASI KETERHUBUNGAN SUNGAI BAWAH TANAH ANTARA SEROPAN DAN BRIBIN DENGAN METODE GEOFISIKA VERY LOW FREQUENCY DI DAERAH GUNUNGKIDUL, YOGYAKARTA; ESTIMATION OF THE INTERCONNECTIVITY BETWEEN SEROPAN AND BRIBIN KARSTIC AQUIFER USING THE VERY LOW FREQUENCY GEOPHYSICS METHOD IN GUNUNG KIDUL REGENCY, YOGYAKARTA

Febri Rismaningsih, Sismanto

2014 | Disertasi | PROGRAM STUDI S2 ILMU FISIKA

A study of the interconnection of the karstic aquifer between Seropan and Bribin using the Very Low Frequency (VLF) Geophysical Method was done in Gombong region, from Ponjong Subdistrict to Dadapayu, Semanu Subdistrict, Gunung Kidul, Yogyakarta. This study aimed at determining the direction and the pattern of the flow of karstic aquifer as well as determining the position of the interconnection between Seropan River and Bribin River. The interpretation was done from the data of VLF tilt angle and ellipticity to estimate the flow of karstic aquifer that were interpreted qualitatively and quantitatively. The data collection was done from the 5th to 26th of September 2013. The qualitative interpretation was done according data processing that had been corrected topographically, then using Moving Average Filter to smoothing, Fraser Filter and Karous Hjelt Filter to show the anomaly of karstic aquifer conductive things. Meanwhile, quantitative interpretation used Inv2DVLF program to determine the position of karstic aquifer. Based on the results of the study, it could be concluded that the direction of the karstic aquifer was from the north to the south. Seropan’s flow and Bribin’s flow met at coordinate 8° 2’ 20,73” LS dan 110° 40’ 48,51” BT. Seropan River was located above Bribin River crossing each other, terraced, and not interconnected.

Kata Kunci : karstic aquifer, VLF