冲积河流河宽调整特性试验研究

摘要

The alluvial river width adjustment is a very complexprocess of change over time and space.Flume experiments explorealluvial river width adjustment feature under water.Studies have shown that the flow ad-justment speed is different under the differentsections of the river width;under the water in early stage,the riverwidth was dramatically widening,the speed of width adjustment arrived at the largest,but the effect time is a very short;river widthslowly over time;when the force and resistance on the sediment particles is equal,the sediment on the slope will be to a stationary state from critical movement,the bed will be stabilized.%　　冲积河流河宽调整是一个十分复杂且随时间和空间变化的过程。通过水槽试验，探讨了清水作用下冲积河流的河宽调整特性。研究表明，不同断面的河宽调整速度是不同的；在清水作用初期，河道急剧展宽，河宽调整速度最大，但作用时间很短；随着时间的推移，河道展宽速度变缓；当作用在泥沙颗粒上的动力与阻力相当后，边坡上的泥沙将由运动转为处于临界起动的静止状态，床面和河宽趋于稳定。