| The "5.12" Wenchuan earthquake triggered large amount of geological disasters,which make it easy to a happen of debris flow with heavy rainfall,which cause huge losses to the people’s life and property. Therefore,after the earthquake debris flow characteristics and risk assessment of the project management and disaster prevention is of great practical significance.The research study on debris flow of wuxinggou, firstly, found out the five-star ditch regional geological environment conditions in the study area, and specific characteristic analysis. Using terrain data and ArcGIS to source distribution is analyzed. Research various sources start mode,source calculation method is proposed, and calculates the total amount of source and source storage. Secondly, the combination of Valley topography and geological conditions to calculate the density of debris flow, velocity, peak discharge,a debris flow process total amount and a mud-rock flow rushed out of solid material.Thirdly, on the basis of the development characteristics, using the system theory of analytic hierarchy process, select a rushed out of the total solid matter A1,A2, landslides occurred frequency, the basin area average grade A4, A3, ditch bed river cutting density A5 and A6 loose solid material reserves, unstable ditch bed scale A7 and 24-hour rainfall A88 indexes, such as, the judging matrix was established with the help of MATLAB software to calculate the evaluation index weight, make quantitative assessment of the danger of the wuxinggou,and use lixilin model to analyze the results of evaluation. Finally,in view of residents settlements at debris flow accumulation zone, combining with risk of landslides mud height, make the site potential risk assessment of debris flow,which can provide basic data for the control engineering, site selection, the layout of industrial and agricultural production around wuxinggou, at the same time, it has a certain reference value to the project management of the similar type debris flow. |
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