Application of stepwise discriminant analysis to screening evaluation factors of debris flow

Screening multiple factors according to their contribution to the debris flow is carried out based on the principle of stepwise discriminant analysis. And then the weights for screened evaluation factors are determined based on improved analytic hierarchy process; so that judgment matrix can meet the consistency requirements, avoiding the high-subjectivity in adjusting the judgment matrix during post-test. The site-specific debris flow risk is evaluated with example verification based on the screening and weight determining of evaluation factors. The results show that the screened factors actually reflect local debris flow risk; and they are closer to the actual situation comparing to traditional methods.