Many debris flows have occurred in the areas surrounding the epicenter of the Wenchuan earthquake. Susceptibility assessment of debris flows in this area is especially important for disaster prevention and mitigation. This paper studies one of the worst hit areas, the Subao river valley, and the susceptibility assessment river flows in you score pdf debris flows is performed based on field surveys and remote sensing interpretation.
By investigating the formation conditions of debris flows in the valley, the following assessment factors are selected: mixture density of landslides and rock avalanches, distance to the seismogenic fault, stratum lithology, ground roughness, and hillside angle. Each of the assessment factors is further divided into five grades. Then, the assessment model is built using the multifactor superposition method to assess the debris flow susceptibility. Based on the assessment results, the Subao river valley is divided into three areas: high susceptibility areas, medium susceptibility areas, and low susceptibility areas.
The high susceptibility areas are concentrated in the middle of the valley, accounting for 17. The medium susceptibility areas are in the middle and lower reaches, most of which are located on both sides of the high susceptibility areas and account for 45. The remainders are classified as low susceptibility areas. The results of the model are in accordance with the actual debris flow events that occurred after the earthquake in the valley, confirming that the proposed model is capable of assessing the debris flow susceptibility. The results can also provide guidance for reconstruction planning and debris flow prevention in the Subao river valley. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences. He is now an Associate Professor of Geological Engineering at the Southwest University of Science and Technology in Mianyang, Sichuan Province, China.
He has authored or co-authored more than 40 scientific papers. He is a member of Geographical Society of China. D Program, International Cooperation Project, Knowledge Innovation Project of the Chinese Academy of Sciences. He has also directed or assisted several geohazards assessment projects and the emergency mitigation projects in the Wenchuan earthquake area from the government of Sichuan Province. At present, he is directing a National Natural Science Foundation Project and assisting other two National Natural Science Foundation Projects. Peer review under responsibility of Institute of Rock and Soil Mechanics, Chinese Academy of Sciences.
2015 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B. This is a featured article. Click here for more information. This article is about the river in Southern Oregon. Water exiting a hole in a riverbank forms a smooth rounded mound surrounded by churning rapids.
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