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      • Failure Modes of Large-scale Landslides Induced by 2009 Typhoon Morakot in Southern Taiwan

        ( Keng-hao Kang ),( Hao-hsun Lin ),( Yii-wen Pan ),( Jyh-jong Liao ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

        After the catastrophic landslide at the Shiaolin village during the 2009 Typhoon Morakot, many large-scale landslide areas were delineated using LiDAR DEM. Among those, 356 large-scale landslides caused by the Typhoon Morakot are in southern Taiwan. In addition to the delineation task, the assessment of landslide activity is also essential for risk management. This study aims to classify the failure modes of large scale landslides in order to provide information for further assessment. For remote sensing interpretation, this study adopted google satellite images, multi-period aerial photos, 5x5m/1x1m DEM, and geologic maps. Arc GIS was used to calculate the geomorphic index of the landslides before and after 2009 Typhoon Morakot. We used a variety of parameters including drainage system, shape of bare areas, and characteristics of topography to identify the failure modes of landslides. As a result, this study classify the large-scale landslides induced by the Typhoon Morakot into six categories: colluvium slide, dip slope slide, weathered bedrock slide, rock avalanche, shallow debris slide, and complex type. Among those cases, ten sites are possibly related with gravitational slope deformation.

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