Research On The Activity Characteristics And Distribution Of Debris Flow In The Milin To Jiacha Secation Along The Yarlung Zangbo River

Mountain debris-flow is common a natural catastrophe phenomenon.Two thirds of our country territory in mountainous area, and mostly in monsoon climate zone, plus the development of fracture structure, earthquake frequent, terrain, causing landslides rock surface broken, this areas have the condition for form the debris flow The qinghai-tibet eastern rim is strong growth of natural disasters zone, the area development has a lot of landslide, collapse, debris flow geological disasters. My research area is mainly refers to MiLinXian to JiCha Xian from both sides along the yarlung zangbo river section now, the debris flow distribute in the eastern edge of the qinghai-tibet plateau ,geological disasters more intense zone development. In this paper the research area of 168 row debris flow writer made field investigation, indoors The writer use software such as Arcview,ArcGIS,method of remote sensing images interpretation and combining with the method of field investigation to study the activities and distribution of debris flow.Collect the natural and engineering geological environment material of research area, statistical and analysis the formation of gully erosion, handling and accumulation characteristics of 168 debris flow of the syudy area. Research in the yarlung zangbo river suture zone, the north-south across eastern plate Himalayan plates, Wolfgang bottom northern and southern tanglha ~ plates, geological and tectonic action is strong, located inⅧdegreesⅦdegrees earthquake zones, lithology weathering serious, cliff body is broken, new tectonic campaign is active, there have been a lot of residual diluvial and blunt flood debris exist, mudslides accumulate loose material sources abundant, the provenance of statistics is obtained through indoor sensing. Years of average rainfall, rainfall about 600mm area is abundant, the contribution of existence, through the interpretation of the statistics, presents the research in greatly small contribution of that number about 535 a. Article 168 of debris flow gully in the debris flow gully, 157 in elevation difference 1000m above.Through the field survey, research and analysis the erosion,transportation,and accumulation of debris flow, it is concluded that the erosion gully research in debris flow more intense, and a comparison of the debris flow scour depth can achieve several meters deep, in the research area, there was a general mudslides channel internal platform exist, mudslides deep accumulation platform angle.cutting depth, can reach more than 60 meters, this not a mud-rock flow, been shaped punching formation. Mudslides The area of the debris flow handling ability is stronger, the elevation of the debris flow handling easier; Carrying capacity of the study area debris flows are relatively strong, the greater the height difference is conducive debris removal; handling mainly rare form of landslides and debris flow characteristics of viscous. Research in debris flow accumulation characteristics mainly through the fan , summed up the body embody research in fan body can be divided into fan-shaped accumulation fan, ginkgo biloba accumulation fan, fold form accumulation fan, fan body missing type, accumulation cone.In the research area, the author of the debris flow distribution mainly from the lithology, geological structures, rainfall, landform these aspects, through analysis of study area lithology, rainfall isoline, geological structures, terrain gradient, terrain elevation statistical analysis found that in this area, the main controlling factors affect debris flow distribution is lithology, terrain gradient and the terrain elevation, and rainfall and geological structure influence is relatively minor.