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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24095

Title: A Case Study on the Occurrence of Regional Debris Flow Hazard in Central Taiwan
Authors: C.-C. Lee;C.-Y. Ku;S.-M. Hsu;Y.-L. Chang;S.-Y. Chi
Contributors: NTOU:Department of Harbor and River Engineering
國立臺灣海洋大學:河海工程學系
Keywords: debris flow;landslide;rainfall intensity;Chi-Chi earthquake;Taiwan
Date: 2011
Issue Date: 2011-10-20T08:10:18Z
Publisher: Monitoring, Simulation , Prevention and Remediation of Dense and Debris Flow II, WIT Transactions on Engineering Sciences
Abstract: abstract:Large-scale debris flow hazards occurred in Ta-Chia River watershed during typhoons that passed through Taiwan from 2001 to 2005 without forewarning. Especially, the Minduli typhoon event in 2004 hit Taiwan which caused severe property damage and inflicted heavy casualties.
Though landslide-induced debris flows present a hazard that is being increasingly recognized, such a large-scale debris flow hazard in Ta-Chia River watershed still appears to be particular. Until now, few detailed case studies of regional debris flow hazards in Ta-Chia River watershed have been presented in the literature.
In this paper, we present a detailed study on the occurrence of regional debris flow hazard in Ta-Chia River watershed and reveal the trigger mechanism of the landslide and debris flow.
To explore the coupling between the Chi-Chi earthquake and sequential regional debris flow hazards in Ta-Chia River watershed, the remote sensing data, Digital Elevation Model (DEM), historical landslides, and rainfall data were adopted in this study.
For characterizing temporal aspects of the hazard, aerial photographs and satellite images of multi-temporal stages were used.
Spatial distribution of landslides and rainfall characteristics were also discussed.
Our findings indicate that the regional debris flow hazards were mainly caused by the huge amount of sparsely deposited materials from landslides triggered by Chi-Chi earthquake. Rapidly increasing water pressure caused by typhoon events provided a powerful force that moved the sparsely deposited materials into gullies and then triggered the debris flow movement.
A strong coupling between the spatial distribution of rainfalls and the occurrence of regional debris flows is also addressed.
Relation: 60, pp.135-146
URI: http://ntour.ntou.edu.tw/handle/987654321/24095
Appears in Collections:[河海工程學系] 期刊論文

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