刚性植被对沿坡运动泥沙异重流动力及湍流特性的影响

开展一系列开闸式斜坡泥沙异重流水槽实验,采用高速相机记录异重流发展过程,并利用声学多普勒流速仪(acoustic doppler velocimeter,ADV)获取泥沙异重流的速度、浓度及湍流结构,探究刚性植被对异重流运动特性的影响.实验结果表明:随着植被高度的增大,泥沙异重流的头部与尾部发生分离,且植被高度对异重流...

EFFECT OF RIGID VEGETATION ON DYNAMICS AND TURBULENCE OF SEDIMENT GRAVITY FLOW DOWNSLOPE

A series of flume experiments were conducted to simulate gravity currents on sluice-opening downslope. The development course of particle-laden gravity currents was videoed with a high-speed camera, in which the velocity, concentration, and turbulence structures of turbidity currents were acquired using acoustic Doppler velocimeter (ADV) to understand the dynamics of particle-laden gravity currents under the effects of rigid vegetation. Results show that with the increase of vegetation height, the head and tail of particle-laden gravity currents were separated, and the vegetation height was more effect than the vegetation density on reducing the front velocity. Due to the presence of vegetation, both the peak velocity and the corresponding position shown in the velocity profile changed. In addition, the turbulence caused by the interaction between vegetation and gravity currents changed the sediment concentration profile and underpinned the suspended sediment particles upward. The findings of this study provide a significant scientific basis for solving engineering issues relative to natural environment protection and underwater engineering construction.