Study On Simulation Of Debris Flows Caused By Rainfall With Yingxiu Segment Region Of The Minjiang River As An Example

Chinese territory is very vast and located in two major earthquakes range in theworld, Central Pacific seismic belt and Eurasian seismic zone intersections, by thePacific Plate, Indian Plate and the Philippine plate extrusion, earthquake fault zonesare well developed, China is one of the world’s seismic activity strongest earthquakedisasters,5.12Wenchuan Earthquake-induced landslides and other geologicaldisasters, it is estimated that the entire disaster area earthquake triggered the collapse,landslide more than50000potential debris flow for nearly a thousand articles on thesafety of the people to cause a direct threat to the disaster$12,000more than thedistribution of the complex type, the destruction of the huge, rare in the world. Thedevastating earthquake in a large number of mountain cracking, resulting in a lot ofloose deposits, formation of potentially unstable slopes, hidden strong, constitute adisaster threat, and their number is difficult to estimate. Potentially unstable slopes,under certain conditions will induce sudden landslides; also pose a major threat to thenew settlements of people’s lives and property. Therefore, the use of new technologyand methods of rapid identification of sudden debris flow hazards in the hardest hit bythe distribution and trait characteristics, and risk zoning and early warning andforecasting of important scientific significance and practical value.Large scale loose solid material is the material basis of debris flow. A large ofloose solid material solid material caused by the earthquake directly or indirectly wasaccumulated at the slopes. It was estimated that in a long range, the scale andfrequency of debris flows would increase obviously, experts considered the effectwould last for at least20years. According to the land and resources department of theauthorities, only in the region of Sichuan, there is805channels threaten by debrisflow. Many studies have shown that precipitation induced debris flows, and study therelationship between precipitation and debris flow is to carry out the important stepsof the debris flow forecasting, zoning and disaster prevention. The occurrence ofdebris flow and rainfall are closely related, but not all rainfall can stimulate the debrisflow. Rainfall on a time scale of the measure,It has been proven no close relationshipbetween annual rainfall and debris flow occurred, unable to characterize the annualrainfall of debris flow occurrence regularity. From another perspective, the occurrenceof debris flow is a short-term process, and the rainfall associated with it also must becontrolled in a limited time scale. And debris flow, the relationship between rainfall isconsidered to be from the early rainfall and short duration rainfall intensity, consistingof, but, due to the outbreak of the rainfall and debris flow complex, calculation themudslides outbreak of the pre-rainfall and short duration rain strong is very difficult.Debris flow is a complex natural phenomenon, influenced by many factors, andthe relationship between the factors is complex and uncertainty.and for debris flowsimulation method, the start of the debris flow, the outbreak of the debris flowsimulation of the time dynamics, spatial heterogeneity and uncertainty, mudslides,natural complexity, making the accurate simulation of debris flow greatly curtailed.Cellular Automata is a typical discrete spatial and temporal frame model, because ofits bottom-up characteristics in the simulation of debris flows, landslides, volcaniclava flows and other complex natural phenomena, surface processes have greatpotential and advantages.In this paper, a computer model of cellular automata, simulation under differentcircumstances, the critical rainfall, help to reveal the possibility of a landslidetriggered by pre-precipitation in a specific geographical conditions, and calculationsindicates, in the study area, the outbreak of the early debris flow rainfall (24h) in the60mm-110mm or so, short duration rainfall intensity (10m) about15mm-45mm,which are in the possible range of the local rainfall. Finally, the use of terraininformation entropy analysis of the study area of the debris flow risk, and compare theresults of two studies of cellular automata simulation results with the availability andaccuracy. This article discusses the methods and results provide valuable informationfor the disaster debris flow forecast.