Review on depositional behavior of viscous debris flow

Debris flow is one of geological destructive processes that usually result in significant morphological evolution and hazards in mountainous regions, influenced on people's lives and properties security seriously. Viscous debris flow is a typical one, which characterized as high density, ranged from clay to meters boulders and destroyed seriously. The initiation, motion and deposition mechanisms are rather complexity and still a debate currently. Due to disaster always emerged on the deposit process, so this paper began with a survey of literature on deposit process and depositional characteristic of viscous debris flow. By reviewing on the theory model, deposit process and depositional characteristic combined with experiment and field work, found that theory models were too simple to use in natural debris flow. Modeling always ignored some important characteristics, such as scaling effect, boundary effect, time effect, etc. Experiment research also rather limited and can't consider scale and boundary effect very well. Field work was the only way to recognize the physical feature of debris flow, and it's very necessary to improve the quality and quantity of the data available in the next work. Reveal the deposition mechanism from a single surge model was proposed to build, which will consider both interstitial flow and coarse granular. In this model, boulders contact force, disperse force and cohesion force will be analyzed. Based on real topography, the simulation result will have practical significance in forecasting deposition area and destroy degree in some way.