Study on Runout Volume and Runout Zones of Rainstorm and Channelized Debris Flows
FANG Qunsheng;ZHANG Weixu;XIA Chenhao;WANG Shuaiyong;YANG Tao;LIU Xinlei;State Key Laboratory for Geo-Hazard Prevention and Geo-Environment Protection,Chengdu University of Technology;
It is quite different that the influence factors and weights vary of different kinds of a one-time runout volume and runout zones ofrainstorm and channelized debris flows. Rainstorm-induced debris flows were remobilized from large amounts of loose material triggered byWenchuan earthquake. This paper selected the 20 rainstorms and channelized debris flows which had an entire alluvial fans and a single typeas a typical case. And researched a one-time runout volume and the maximum runout distance and depositional width of rainstorm andchannelized debris flows after a one-time rainfall. Applying the multivariate regression analysis,a mathematical model was established toestimate a one-time runout volume and the maximum runout distance and depositional width. The validation shows that affecting a one-timerunout volume and runout zones of rainstorm and channelized debris flows is not only including the total amount of material source,dynamicreserve,drainage area,the longitudinal length of the channel and relative height difference of natural factor,but also damming,mineralsexploitation and slope excavation in debris flows valley of anthropogenic factor. The new model is suitable for predicting a one-time runoutvolume and hazardous zones of rainstorm and channelized debris flow in the Wenchuan earthquake areas.
【CateGory Index】： P642.23