Simulating debris flow deposition using a two-dimensional finite model and Soil Conservation Service-curve number approach for Hanlin gully of southern Gansu (China)

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• 作者：Peng Zhang ; Jinzhu Ma ; Heping Shu ; Tuo Han ; Yali Zhang
• 关键词：Soil Conservation Service ; curve number ; FLO ; 2D ; GIS ; Debris flow ; Hazard zone ; Hanlin gully
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：73
• 期：10
• 页码：6417-6426
• 全文大小：1,626 KB
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  Tsai TL, Wang JK
• 作者单位：Peng Zhang (1)
  Jinzhu Ma (1)
  Heping Shu (1)
  Tuo Han (1)
  Yali Zhang (1)
  
  1. Key Laboratory of Western China’s Environmental Systems (MOE), Lanzhou University, Lanzhou, 730000, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Evaluating the flood discharge and deposition process of a debris flow is important for risk assessment, management, and design of possible supporting works for geo-hazard mitigation. The movement and deposition process of a typical debris flow gully in southern Gansu province, China, was simulated using the Soil Conservation Service-curve number (SCS-CN) approach and a two-dimensional finite model (FLO-2D PRO model) coupled with geographic information systems. Runoff volumes and depths were obtained by the use of the SCS-CN model using different precipitations and different intervals. The deposition, velocity, impact force, and influence zone of the debris flow were simulated with the FLO-2D PRO model based on the results of the SCS-CN method. Simulation results for a storm that occurred on 12 October 2010 suggest a maximum flow velocity of 23.1?m/s, a maximum deposition depth of 27.9?m, and a hazard zone of about 0.414?km2. These results were consistent with measured results from the documented debris flow. Verification demonstrated that model results could be used to help predict disaster-causing debris flows, thus helping to protect the lives, property, and economy of the local population.