A STUDY ON THE PREVENTION AND CONTROL MODEL OF DEBRIS FLOW DISASTER IN DIFFICULT DRAINAGE AREA—A CASE STUDY OF KEKEXUN DEBRIS FLOW IN BURQIN, XINJIANG

Debris flow is a serious natural hazard that requires effective prevention and control measures. However,the conventional mode of "stability,blocking and drainage" is not applicable for debris flow without drainage conditions. This paper proposes a new debris flow control model of "upstream blocking material source,middle stream stable channel and energy dissipation,and downstream comprehensive drainage". This model utilizes the downstream topography and geological conditions to create a seepage area and a water barrier that can infiltrate and drain the water bodies of debris flow,thus reducing the disaster risk. Taking Koxun debris flow in Burjin County of Altai,Xinjiang as a case study,this paper analyzes the characteristics and parameters of debris flow gully,optimizes the engineering layout and design,and verifies the feasibility and effectiveness of the new model through field application. The paper also discusses the adaptability and applicability of the new model for different situations and provides reference for similar debris flow prevention and control in Xinjiang and other places.