Discussion on framework of landslide and debris-flow risk assessments

The lack of a unified concept system and theoretical framework is a key problem for the further development of landslide and debris-flow risk assessments.By investigating of the basic concepts of risk assessment and analyzing the relationships between uncertainty and hazard as well as hazard and risk,the connotation of susceptibility,hazard and risk are defined clearly.According to these definitions of the concepts,mathematical expressions of hazard and vulnerability are proposed,and the methods for different scales and categories of risk assessments are discussed.A quantitative and semi-quantitative theoretical framework is constructed with the concepts,definitions,and mathematical expressions,and can be served as a basis for the risk assessment of landslide and debris flow.