Hazard Assessment And Prevention Of Wuxinggou Debris Flow In Beichuan County

The Wenchuan earthquake on May 12 th creates massive landslide and collapse on Beichuan County town of Lei Gu.,formed in the valley within the large collapse,it is the formation region of Wuxinggou debris flow.On September 24 th,2008 and July 17 th,2009,induced by heavy rainfall,a large debris flow disaster occurred,causing serious economic losses to Wuxinggou.So,to study,evaluate and control the geological hazard,can prevent the disaster from happening again,try to reduce the loss.Of debris flow in this study,on the basis of research results and research experience,through the debris flow field geological investigation,find out the Wuxinggou valley area of 36.77 Km2;The main channel length is 11.92 Km;In the basin elevation of 677 m ~ 1880 m.On this basis,calculate the Wuxinggou gully density under different design frequency,flow velocity,peak flow,total flow,impact and dynamic characteristics,such as the size of the data.Refer to previous research results in this paper,selects 10 influencing factors as evaluation index: Loose solid material reserves,Sediment supply section length,drainage area,Valley relative height,and Main channel longitudinal slope,Gully bed bending coefficient,the slope of hillside,Vegetation coverage,the maximum rainfall in 24 hours and the Watershed population density.Then,decides the proportion of each factor by the analytic hierarchy process(AHP),gives the hazard assessment by comprehensive evaluation method,and arrives at a conclusion of the debris flow’s threat level.It is concluded that the debris flow risk level for the highly dangerous.Finally puts forward the main ditch the Wuxinggou groove,shuangliu 1 set a upstream dam;The Wuxinggou ditch the threat to the site periphery decorate unilateral protective wall engineering prevention measures and the preliminary design scheme.