Analyse Couplée D'images Vidéo Et De Données Sismiques Pour L’étude De La Dynamique D’écoulement Des Lahars Sur Le Volcan Merapi, Indonésie
Penulis/Author
Dr. Sandy Budi Wibowo, S.P., M.Sc. (1); Lavigne, Franck (2); Philippe Mourot (3); Jean-Philippe Metaxian (4); Marie Zeghdoudi (5); Clément Virmoux (6); Dr. Danang Sri Hadmoko, S.Si., M.Sc (8); Dr. Bachtiar Wahyu Mutaqin, S.Kel., M.Sc. (9)
Tanggal/Date
31 2015
Kata Kunci/Keyword
Abstrak/Abstract
Lahar flow dynamics is still poorly understood due to the difficulty of data acquisition in the field. The eruption of the Merapi volcano (Indonesia) in October-November 2010 allowed us to collect new information in the frame of the SEDIMER research program (Sediment-related Disasters following the 2010 eruption of Merapi Volcano, Java, Indonesia, 2012-2015). Lahar dynamics are studied based on the coupling between video images and seismic data. We installed a seismic station at Gendol river (1090 meters asl, 4.6 km south from the summit) consisting of two geophones placed 76 meters apart parallel to the river, a high definition camera on the edge of the river and two raingauges at east and west side of the river. We also used a walkietalkie to receive seismic signal from the seismometers belonging to the Merapi Observatory (BPPTKG) and to communicate with local communities. This article focuses on the debris-flow-type lahar which was recorded on February 28,2014. The results of the video and the seismic analysis show that the behavior of this lahar changed continuously during the event. The lahar front moved at an average speed of 4.1 mis at the observation site. Its maximum velocity reached 145 m/s with a peak discharge of 473 m3/s. The maximum depth of the flow reached 7 m. Almost 600 blocks of more than 1 m main axis were identified on the surface of the lahar during 36 minutes, which represents an average block discharge of 17 blocks per minute. The interpretation of amplitude and frequency of the seismic signals were improved by video analysis data, especially for the contrast between debris flow and hyperconcentrated flow during lahar occurrence.
Rumpun Ilmu
Geografi
Bahasa Asli/Original Language
French
Level
Internasional
Status
Dokumen Karya
No
Judul
Tipe Dokumen
Aksi
1
2015 Artikel Wibowo dkk.pdf
[PAK] Full Dokumen
2
Analyse couplée d'images vidéo et de données sismiques pour l’étude de la dynamique Cek Turnityn-min.pdf
