A Mass-Change Model for the Estimation of Debris-Flow Runout
A Mass-Change Model for the Estimation of Debris-Flow Runout
复制标题
泥石流跳动估算的质量变化模型
DOI：
--
复制
发表时间：
1988
期刊：
影响因子：
--
通讯作者：
W. Z. Savage
中科院分区：
文献类型：
--
作者：
S. Cannon;W. Z. Savage
我们使用基于动量守恒原理的简单数学模型分析了泥石流的跳动潜力。该模型的独特之处在于它评估了泥石流质量随泥石流行进距离变化的影响。该模型用于研究单独的粘性阻力的影响，以及流动质量变化与行程和粘性阻力的配对影响，最后，质量变化、粘度、摩擦力和坡角对泥石流纵向速度分布和跳动距离的综合影响。对模型的评估以及每个变量的综合影响表明，随着行程的流动质量的增加将导致更长的总跳动距离，并且流动将在行进的距离上保持较低的速度。行进过程中的质量损失将导致总跳动距离缩短，并且流量将在行进距离内保持较高的速度。增加坡度角度可实现更长的跳动距离，但当流动的摩擦阻力大于坡度角度的影响时，会导致更短的跳动距离。在目前的状态下，该模型无法用实际泥石流的数据进行校准。然而，该模型确实提供了进一步研究的框架。
We analyzed the runout potential of debris flows using a simple mathematical model based on the principle of conservation of momentum. This model is unique in that it evaluates the effect of a change in mass of a debris flow over the distance the flow travels. The model is used to examine the influence of viscous resistance alone, the paired influence of a change in mass of the flow with travel and viscous resistance, and finally, the combined effects of mass change, viscosity, friction, and slope angle on the longitudinal velocity distributions and runout distances of debris flows. Evaluations of the model with the combined influences of each of the variables indicate that a gain in mass by the flow with travel will result in longer total runout distances, and that the flow will maintain lower velocities over the distance traveled. A loss of mass with travel will result in shorter total runout distances, and the flow will maintain higher velocities over the distance traveled. Increasing slope angles allow for longer runout distances, but when frictional resistance to flow is greater than the influence of the slope angle, shorter runout distances result. In its present state, the model cannot be calibrated with data from actual debris flows. However, the model does provide a framework for further study.