Debris Flow Characteristics and Risk Degree Assessment in Changyuan Gully, Huairou District, Beijing

Debris flow risk degree assessment is an important part of hazard assessment; it has great significance in disaster reduction to achieve the security of mountains. From the view of system theory, this paper uses analytic hierarchy process (AHP) to analyze the factors which affect debris flow, establishes hierarchy model indicators system of Changyuan gully debris flow risk degree assessment and gives weight to each factor. The result is high risk; it has a high relativity to the real situation. For this debris flow disaster prevention and mitigation, this paper proposes to establish monitoring and early warning systems. The principle should be based on prevention and supplemented by means of management.