Study On The Development Characteristics And Control Measures Of Debris Flow In Tiantong Temple,Dongwu Town,Zhejiang Province

Debris flow disasters often have a serious impact on our production,living and living environment because of their rapid outbreak and great destructiveness.After the super typhoon "lichma",many landslides and collapses occurred in the typhoon area,which brought a lot of debris materials to the tiantongsi debris flow.Affected by the typhoon and precipitation,the geological characteristics of the debris flow in Dongwu town of Ningbo City in the study area have great changes compared with those before the typhoon,and the existing relevant data can not fully meet the production requirements.Therefore,on the basis of in-depth study of debris flow,it is of great significance to analyze the zoning,risk characteristics and prevention methods of debris flow.Tiantongsi debris flow is located in Tiantong temple,Dongwu Town,Ningbo City.It is characterized by many gully areas,large longitudinal gradient,strong typhoon influence,rich material sources,good hydrogeological characteristics,and serious impact on the surrounding areas.It belongs to the debris flow gully affected by typhoon.Based on the study of tiantongsi debris flow,the main characteristics of the debris flow are as follows:1.Great harm.The main threat object of Tiantong Temple debris flow is Tiantong Temple Scenic Area in Dongwu town.2.The location of gully forming area is narrow and steep,the longitudinal slope is very large,and the channel in circulation area and accumulation area is wide and gentle.The area of tiantongsi debris flow basin is about 2.1km2,the length of the main gully is 950m,the shape of the gully is dendritic,the relative height difference is 495m,and the average longitudinal slope of the main gully is 495 ‰.3.According to the risk degree of the upper reaches and the lower reaches,the debris flow is divided into three dangerous areas.4.Tiantongsi debris flow is a medium and easy debris flow gully,in which the total amount of debris flow material source washed out is 28500 m3,and the potential source volume is 117000 m3.5.According to the condition of tiantongsi debris flow gully and the characteristics of solid material source,combined with the treatment experience,it is suggested that the prevention measures should be based on blocking and reinforcement,supplemented by comprehensive treatment of protection,drainage and drainage,and the prevention measures of bank slope protection,gully bed drainage and gully mouth blocking in the middle reaches.