A landslide dam breach induced debris flow – a cas

Authors: ChienYuan Chen TienChien Chen FanChieh Yu FongYi Hung

Publish Date: 2004/09/08

Volume: 47, Issue: 1, Pages: 91-101

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Abstract

A catastrophic landslide dam breach induced debris flow initiated in DaCuKeng stream Ruifang town when typhoon Xangsane hit Taiwan on November 1 2000 Different available methodologies were used to model the natural dam breach induced debris flow and using field topography the hazard zones affected by debris mixtures were delineated The numerical finite element or finite difference method is time consuming for the simulation of debris flow inundation areas and hence a rulesbased GIS Geographic Information System analysis is proposed in this study The model emphasizes the downstream inundated fanshaped areas covered by debris mixtures through the overflow point Topography and gradient are assumed to dominate the debris masses deposition mechanism in the GIS analysis The approach considers the parameters’ effects such as the runout distance the debris masses magnitude and the inundated areas The results of this study reveal that the GIS process using the rulebased approach speeds up the processing of delineating the hazard zones and assessment which can be applied to earlywarning and preliminary inundation hazardous mapping

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