流滑型窝崩水流运动和地形变化概化模拟试验

针对长江中下游的流滑型窝崩进行了典型窝崩水槽概化模拟试验，分析研究了窝崩形成与发展及窝塘水流运动和地形变化。结果表明，流滑型窝崩主要是由水流冲刷和岸坡上部土体持续崩塌所形成，且发展迅速，发展过程主要有始发期、发展初期、发展中期、发展成熟期和发展稳定期等阶段。随着窝崩的发展，岸坡崩塌、窝塘扩展，窝塘内回流和口门外涡流逐渐下移，窝塘内回流由椭圆形趋向圆形，强度由强变弱，岸坡先整体冲刷后退，之后窝塘由上下扩展逐渐演变为以下半部分拓展为主。

Generalized simulation tests on flow movement and slope topography change of riverbank flow-induced slide with nest shape

The generalized simulation tests on riverbank flow-induced slide with nest shape are carried out in a typical collapse flume for the flow-sliding caving with nest shape in the middle and lower reaches of the Yangtze River, and the formation and development process of the flow-induced collapse and the flow movement and slope topography change in the pond are analyzed and studied. The experimental results show that the flow-induced slide is mainly caused by the erosion of water flow and the continuous collapse of the upper soil of the riverbank slope, and develops rapidly; and its development process mainly includes the initial stage, the preliminary stage, the middle stage, the mature stage and the stable stage. With the development of the flow-induced slide with nest shape, the riverbank collapses and the nest pond expands continuously, backflow inside the nest pond and the vortex outside the mouth gradually move downward, and the backflow inside the nest pond tends to change from being ellipse-shaped to round-shaped, the backflow intensity changes from strong to weak, and the riverbank slope is first scoured away as a whole, and then the nest pond gradually expands from the whole part to a half one. The simulation tests have further explored the hydrodynamic and geomorphic characteristics during the formation and development of the flow-induced collapse. The study can provide some references for similar experimental researches in the future.