Local landslide risk assessment (AGGREGATION CH 7)

Abstract

Landslide risk assessment was carried out at local level considering runout modelling and up-scaling of the runout parameters. The use of runout modelling for landslide risk assessment is new. Detailed quantitative results obtained by the runout simulation allowed us to obtain many parameters, such as depth, velocity, momentum, etc. for every location in the study area. This approach substitutes the empirical relationship with runout distance or the empirical estimation of damage based on previous disasters. Still there is a gap with civil and structural engineering in modelling the impact of landslides on buildings or other types of infrastructure. Due to the fact that the model used was still under development and cumulative or maximum momentum were not suitable for assessing vulnerability. Instead, runout depth was used with an estimation of the damage of a mudflow at 0.5m, 1m and 1.5m depending on the building typology and condition. Thus, the use of runout modelling for risk assessment opens new possibilities for quantitative landslide risk assessment.