Production of Urban Debris Flow Hazard Maps: Case study in Daegu, Korea

Production of Urban Debris Flow Hazard Maps: Case study in Daegu, Korea

Abstract : This study is classified as a possible indirect and direct damage caused by landslides in Daegu and produces urban debris flow hazard maps. The range of urban debris flow is identified in the spatial scale of census output areas using Flow-R forced by landslide hazard maps. After dividing the type of building in each census output area into two (reinforced concrete structures and non-reinforced concrete structures), the physical hazard is assessed in applying the corresponding vulnerability function. An index-based model is proposed to represent indirect damages, using this model application, the socioeconomic hazard is also assessed. The urban debris flow hazard is finally assessed by integrating two hazard assessments. The assessment maps produced in this study can be used in identifying debris flow risk regions in the Daegu metropolitan and are expected to serve as basic data to prepare debris flow protection facilities.

Abstract : This study is classified as a possible indirect and direct damage caused by landslides in Daegu and produces urban debris flow hazard maps. The range of urban debris flow is identified in the spatial scale of census output areas using Flow-R forced by landslide hazard maps. After dividing the type of building in each census output area into two (reinforced concrete structures and non-reinforced concrete structures), the physical hazard is assessed in applying the corresponding vulnerability function. An index-based model is proposed to represent indirect damages, using this model application, the socioeconomic hazard is also assessed. The urban debris flow hazard is finally assessed by integrating two hazard assessments. The assessment maps produced in this study can be used in identifying debris flow risk regions in the Daegu metropolitan and are expected to serve as basic data to prepare debris flow protection facilities.