ACADSTAFF UGM
| Title | : | Perhitungan volume dan karakterisasi material endapan erupsi gunungapi Kelud tahun 2014 di sungai Bladak bagian hulu dengan metode geofisika |
| Author | : |
ANASTASIA NENI C. P (1) Prof. Dr. rer. nat. Junun Sartohadi, M.Sc. (2) Dr. Wahyudi, M.S. (3) |
| Date | : | 30 2015 |
| Keyword | : | gunungapi Kelud,material endapan,Bladak,Geofisika,pumice gunungapi Kelud,material endapan,Bladak,Geofisika,pumice |
| Abstract | : | Kelud volcano had erupted on February, 13th2014, it produced a huge ammount of material at the upstream of Bladak River. That materials potentially to be material flood in downstream area. The mitigation efforts to minimize flood hazard require volume information of the materials at the upstream. Moreover, information of physical characteristics of the materials is valuable for people at the surrounding areas. Volume assessment and materials characteristics were carried out through field measurements. The volume assessment of materials was done by using geophysical methods to estimate sediment thickness. Kind of geophysical methods applied was microseismic method and seismic refraction. The results obtained from microseismic data processing was the value of natural frequency (f0) at each microseismic measurement point. The results obtained from seismic refraction data processing was the P wave velocity of sediment material, in which the P wave velocity will be derivatived to obtain the S wave velocity. The S wave velocity used for calculating the thickness of sediment combined with the value of natural frequency through the formula of h = Vs/4f0. The isopach line was produced through interpolation of sediment thickness measurement points. Later, the isopach lines were applied for volume assessment. Characterization of sediment material was done by calculating the percentage of pumice and non-pumice. The sediment material characterization data was processed manuallythrough field photoes analysis. The data processing result were then analyzed descriptively.Materials thickness of pumice in land surface was analyzed according to slope classes. The result of volume assessment of the sediment materials at the upper stream of Bladak River was 27.6 million m3. The sediment at the upper stream of Bladak River consisted of 91.8% of pumice material. The pumice materials might be valuable for local economical generator as those materials have serveral purposes, but should be investigated thoroughly through research. The community in the area surrounding of Bladak River may exploid the materials for building materials or lightweight concrete materials, abrasive cloth jean or denim, etc. There were no significant correlation between land surface slope with the thickness of materials in the upper river catchment of Bladak. |
| Group of Knowledge | : | Geofisika |
| Original Language | : | Bahasa Indonesia |
| Level | : | Nasional |
| Status | : |
Published
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Paper MGI.pdf
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