Characteristics and risk assessment of debris flow in northeast tibetan plateau

Abstract

Debris flow disasters frequently occur in northeast Tibetan plateau, especially, along section of the G-213 line from Ceke to Mohan highway in Longwu Gorge. This area is prone to debris flow disasters due to its special geological environment. In present study, we investigated the characteristics of 11 typical debris flow gullies and calculated the risk assessment by matter-element extension method. The matter-element model of debris flow hazard assessment was constructed and ten assessment factors were selected to evaluate the debris flow hazard. The results showed that the matter-element extension method was highly accurate for the risk assessment of debris flow gullies, which was in good agreement with the result of expert assessment, This method has obvious superiority, the risk assessment of debris flow gully was based on the grade, corresponding to the maximum of the comprehensive correlation degree.