中文摘要：

一三维(3D ) 不稳定的混浊水流的数字模型基于沉积运输和骚乱理论的机制被开发。在这个模型，没有泥水的随后的供应的混浊水流的数字模拟用在斜槽实验被使用的一样的参数被进行。完全失去在实验观察的供应的混浊水流的进化过程被模型模仿；数字模型和算法的确认被进行。如果一时打断的过程被认为是一种特殊情况逐渐地打断了基于前面的数字模拟有效性，在逐渐地输下面模仿混浊水流的运动法律是可行的供应。由在这篇文章的这个方法，逐渐地失去供应的沉积沉重的流动的特征被获得，以及它在前面之间的关系速度和沉积集中。

英文摘要：

A three-dimensional （3D） numerical model of unstable turbidity currents is developed based on the mechanism of sediment transport and turbulence theory.In this model,numerical simulation of turbidity currents without subsequent supply of muddy water was conducted using the same parameters as were used in the flume experiments.The evolution process of turbidity currents of completely losing supplies observed in the experiment was simulated by the model; validation of the numerical model and the algorithm was conducted.If momentarily interrupted process is regarded as a special case of the gradually interrupted,based on the preceding numerical simulation validity,it is feasible to simulate the motion law of turbidity currents under losing gradually supplies.By this method in this article,the characteristic of sediment-laden flow of losing gradually supplies was obtained,as well as its relationship between front velocity and sediment concentration.