Research On The Characteristics And Engineering Effect Of Debris Flow Of Dagu River In Brahmaputra

In western China, especially in Tibet deep valleys region widely developed, high-frequency debris flow development, human activity or construction activities and more scarce in the high altitude areas, because of the terrain and texture Tibet complex conditions, easily induced heavy rains and ice fusible landslides, often have a significant impact on the engineering and transport arrangement. As the state of Tibet, water conservancy, hydropower, transportation and other projects continue to advance, debris flow and engineering constraints have become increasingly prominent, so the study on debris flow characteristics in Tibet and its impact on the project is very important, the study will play a decisive role in later Western Construction.Dagu and Jiexu Project area is located on the middle reaches of the Yarlung Zangbo River in Tibet Autonomous Region Sangri County territory, This area belongs to the highland temperate, cold temperate climate, vegetation conditions are poor, strong physical weathering, loose solids tend to build up, Terrain landslides superior project area belongs to Tibet typical stormwater debris flow in topography and meteorological and hydrological conditions, with strong representation. This paper describes the 17 basic characteristics and dynamic characteristics of debris flow, including the provenance characteristics, channel characteristics, accumulation characteristics, frequency characteristics of the outbreak of severe, velocity and flow, etc., through the study found that the amount of debris flow provenance showing bias large, small catchment area, the slope is too large and the absence of fine particulate matter characteristics. On this basis, based on debris flow features designed three physical simulation experiments were underwater debris flow deposition test, landslides blocked river test, debris flow impact test. The overall content of the test is to analyze the main factors that test the impact to measure the impact of debris flow characteristics by changing the size of these factors, the final analysis summary trials conclusions mathematical model proposed can be applied to large ancient street for an hydropower project area mudslide mathematical model of debris flow in the assessment and prevention play an important role.Combined with field investigation and laboratory tests, presented landslides blocked river, underwater siltation and impact on the project area. Depending on the nature of each of the large ancient river channel, the scale and impact of engineering analysis, combined with the specific location of the dam site, ultimately determine the control measures carried out on the impact of the Jiuzhui ditch in Jiexu Hydropower Engineering, Lulong ditch in Dagu Hydropower Engineering to carry out the impact of control measures and sedimentation.