ANALYZING AND ESTIMATING LANDSLIDE RISK IMPACT TO ROAD A CASE STUDY IN SAMIGALUH DISTRICT, KULON PROGO REGENCY, YOGYAKARTA PROVINCE
| Main Authors: | , EKO SETYA NUGROHO, , Dr. Danang Sri Hadmoko, M.Sc |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2012
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/99423/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=54853 |
Daftar Isi:
- Due to many factors favoring the occurrence of landslides: steep slopes , high rainfall, breccia rock, and landuse type (low vegetation density and the dominance of shallow-fiber root vegetation system), road segment 174 has the highest of landslide susceptibility among 21 road segments in Samigaluh. This research aims to analyze and estimate the impact of landslide risk to road in Samigaluh District. The impact of landslide both direct and indirect impact were analyzed in the road segment 174. In this study, direct risk assessment was developed for various scenarios on the basis of hazard (e.g. spatial probability, temporal probability and magnitude class), vulnerability and estimating cost of road damage. Indirect risk assessment was derived from traffic interruption. It was used network analysis and community perception to determine the optimal road which was chosen by commuter The research results show the highest direct impact of debris slide type of magnitude I located in the 20 th mapping unit which is Rp. 89,586.69, Rp. 243,995.46 and Rp. 370,414.67 for return period 1 yr, 3 yr and 5 yr respectively. The lowest direct impact of debris slide type of magnitude I can be founded in the 18 th mapping unit having Rp. 0.04, Rp. 0.11 and Rp. 0.17 for return period 1 yr, 3 yr and 5 yr respectively. The direct impact of rock fall type of magnitude I which is located in the 6 th mapping unit is Rp. 3,976.34, Rp. 9,897.32 and Rp. 13,866.27 for return period 1 yr, 3 yr and 5 yr respectively. Meanwhile, indirect impact which was caused by road blockage is Rp. 4,593,607.20 and Rp. 4,692,794.40 by using network analysis and community perception methods respectively. After class classification, road segment 174 is dominated by very low hazard, very low vulnerability and very low direct impact. This condition compatible with the Jaiswal�s Landslide Magnitude Classification that magnitude I have less hazard probability occurrence and cause minor damage