底沙运动过程中粗粒沙滞留在沙洲，细粒沙被搬走。
In the bedload movement process, coarse sand tended to stay on the sand bar, find sand was brought away.
立波作用下的底沙运动关系到港口的规划和建筑物的安全。
The sediment movement on the bed plays an important role on the planning of ports and waterways and the stability of structures.
并首次在国内试用了中子活化技术对底沙运动进行了示踪测定。
Neutron activation technique was first tried to make tracing measurement for bed-load movement.
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