Disaster Process Simulation About Flash Floods And Debris Flow After The Earthquake

Flash floods and mud-rock flows are common geological disasters in areas with fragile environment under heavy rainfall conditions.After their outbreak,they will cause casualties,damage to houses,infrastructure,roads and other damages as well as damage to the environment.This paper,taking the wenchuan earthquake epicenter lotus core channel for typical small watershed,the introduction of Voellmy-fliud model,reference and determine rainfall flood peak flow rate,density,turbulence coefficient and the parameters such as friction coefficient,mudslide process simulation,and according to the results of numerical simulation,analyze the process of flash flood debris flow movement,extract the mudslide flow,flow velocity,flow depth,physical parameters,such as momentum analysis include mudslides movement process and status,the research results can provide reference for mountain flood prevention and control of debris flow hazard assessment and after an earthquake and basis.The main achievements and understanding of this paper are as follows:1.Based on hec-hms model,the mountain flood production and confluence process line can be obtained by mountain flood simulation,and the mountain flood production and confluence process and flow change can be analyzed.The results show that this flash flood belongs to shuangfeng flash flood and its flow keeps changing.It reached its peak at 23:00 on August 13,2010,and reached its peak at 5:00-6:00 on August 14,2010 for the second time.Moreover,the confluence peak lagged behind the rainfall peak.2.Based on voellmy-slam and RKE model,it can be used to simulate the flash flood and debris flow.In 2010-8-14 include mudslides,for example,from the mountain torrent mud-rock flow process can be divided into five stages,including flash floods began to flow,flash floods,runoff and debris flow movement began,fluid accelerated motion,slow movement and accumulation and the fluid end stage,such as flash flood debris flow movement in different stages of the process simulation and calculation analysis,and accuracy evaluation is 0.983.The results show that the model can be applied to earthquake lotus core groove are numerically simulated.3.Based on GIS and RAMMS post-processing technology,the motion parameters of typical parts of mountain torrents and debris flows can be extracted and calculated in real time,and the motion characteristics of mountain torrents and debris flows can be quantitatively analyzed.The results show that the parameters at any time and at any place can be extracted based on GIS and RAMMS technology to quantitatively analyze the spatial and temporal changes of mountain torrents and debris flows.