中低山冲沟型泥石流运动参数及过程模拟

Runout and process simulation of gully debris flow in middle and low mountains

降雨诱发中低山冲沟型泥石流的运动速度、堆积厚度是泥石流防治的重要参数,以江西省修水县平石寺泥石流为研究对象,采用现场调查、流槽试验、Voellmy碎屑流运动理论和快速物质运动仿真平台(RAMMS3D)等方法对泥石流演化过程模拟。结果表明,泥石流的最大的泥石流运动速度、堆积厚度分别是5.69m/s、12.63 m,各关键位置运动速度、堆积厚度与泥石流现场调查结果相近;现场调查和流槽试验为数值模拟提供地形地貌、干摩擦系数和黏滞系数等关键参数,RAMMS3D数值模拟能够准确地模拟泥石流的运动变形过程,确定泥石流的影响区域。

In order to study the movement speed and deposition thickness of the rain-induced debris flow in mid-low mountain,a new approach was proposed in this paper of the debris flow in Pingshi temple,Xiushui county,Jiangxi province.Field investigation and flume test were to be used to provide the debris flow runout parameter,then Voellmy theory and RAMMS3D were used to simulate the debris flow evolution process.The results show that the maximum velocity and the maximum sedimentary thickness of this debris flow were 5.69 m/s and 12.63 m respectively.The movement velocity and the sedimentary thickness at the key positions of the mudslides similarly to field investigation results.Field investigation and flume test could provide topography,dry friction coefficient and the viscous coefficient for numerical simulation.RAMMS3D numerical simulation can accurately simulate the movement and deformation process of debris flow and determine the affected area of debris flow.