Model test of debris flow source initiation mechanism in Suyu valley of Helan Mountain

In this paper, through model test, the test of the debris flow phenomenon incipient and run-out mode and accumulation characteristics were observed and studied the helan mountain Suyu valley debris flow affected by the gully bed slope, soil water content, and coarse particle content, preliminary discussed the helan mountain debris flow changes under the influence of the three factors, the experimental results showed that: coarse particle content is the strongest, gully slope is the second, and soil water content is the weakest. The lower the coarse particle content, the higher the gully slope and the higher the water content, the easier the debris flow development. The development mode of debris flow is affected by the content of coarse and fine particles. When the content of fine particles is higher, the type of debris flow is channel erosion, while when the content of coarse particles is higher, the type of debris flow is blocking.