坡面泥石流起动模型研究

针对单一坡面泥石流起动模型进行研究。基于土壤动力学理论、土壤下渗理论和土壤水动力学理论,以及土体含水率变化引起土体抗剪切应力变化的物理机理,提出了坡面泥石流起动模式。在此基础上,结合传统分布式水文模型理论,建立了分布式坡面泥石流起动模型。模型应用于云南蒋家沟典型坡面泥石流研究,能够预测坡面泥石流起动的时间、部位和起动量,进行多时段模拟坡面泥石流入沟流量过程线,模拟结果体现了泥石流发生阵发性、不连续性、滞后性的特征,这与实际观测情况吻合,表明应用该模型研究坡面泥石流的起动是可行的,能够为进一步的泥石流数值模拟提供依据。

The Study on the Numerical Model of Debris Flow on the Slope

The model of the initiation of debris flow on the single slope is studied.Based on the theory of dynamic of soil,soil infiltration,and the physical mechanism of soil movement caused by percent moisture content,the mode of the initiation of debris flow on the slope is proposed.Then,combining this with the theory of distributed hydrological model,the numerical model of debris flow on the slope is developed and applied to Jiangjia ravine in Yunnan Province.The model is used to predict the time and position of the initiation of debris flow,and to model the continuous flow rate of debris flow.The results agree well with the measured characteristic of debris flow,which shows that it is feasable to model the debris flow initiation with this model,and the model can give facts for the future study of the numerical simulation of debris flow in the whole watershed.