A Simulating Approach to Debris Flow Runout Based on Voellmy Model
A Case Study of Luzhuang Gully Debris Flow in China
It is necessary to determine sectors that can be affected by debris flow in the mid-low mountain to achieve risk mitigation. In this paper, a method to predict the velocity and sediment thickness of the debris flow is presented. This method consists of three steps, field investigation, flume test, and numerical simulation. The basic parameters of geomorphology and granule gradation were provided from the field investigation. Flume test was performed to compare and calibrate the dry friction coefficient and viscosity coefficient for field investigation. Voellmy model in accordance with one-way flow theory was used for numerical simulation. The numerical model was also employed to simulate the debris flow in Luzhuang gully debris flow, occurred in Huanglong town, Xiushui County located in eastern China on 10 June 2011. The results demonstrated that the debris flow runout determined by Voellmy mode simulation was well consistent with those obtained from field investigation and flume test.
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