Method and its application of the momentum model for debris flow risk zoning

In order to ascertain the distribution of flow depth and velocity of debris flow, the combination of nu-merical modeling and the GIS technology has been used to simulate the movement process of debris flow out of the out-let. The main model of momentum classification of risk zon-ing of debris flow is Z=Khv. Based on the distribution of the velocity and depth of debris flow, the distribution of mo-mentum can be ascertained. Thereby the classification of risk zoning of debris flow can be worked out. A case study of Chacaito Valley in Caracas, Venezuela, is presented to illus-trate the application of the method.