Abstract:

Unascertained measure theory and AHP methods are combined and then applied to evaluate the hazard assessment of debris flow.According to influence factors and grading standards of hazard assessment of debris flow,ten indicators,such as selected debris flow scale,occurrence frequency of debris flow ,drainage area,length of main ditches,maximum relative altitude in drainage area,incising density,bending coefficient of major ditch bed,length proportion of debris supplement section,maximum rainfall in 24 hours and population density,etc,were used to evaluate debris flow hazard.Unascertained measure functions of evaluation of hazard assessment of debris flow were obtained by using unascertained measure theory.Analytic hierarchy process (AHP) were used to calculate weights of the evaluation indices of hazard assessment of debris flow.Credible degree recognition criteria were used to evaluate hazard assessment of debris flow.Finally,the comparative analysis was made with examples.The results show that unascertained measure theory is reasonable and reliable;and it is a new method for evaluating hazard assessment of debris flow