Abstract:For movable bed model

sand wave movement similarity is the basis of the similarity of flow

sediment transportation and river bed evolution. Based on flume experiment

which meets the similarity of geometric

flow and incipient motion

similarities of sand wave height and its composition were analyzed. The results show that: firstly

for the normal model with the same weight ration of prototype sand and model sand

sand wave height is largely in line with geometric similarity and the average deviation is only about 9.2%. Furthermore

sand wave height varies with flow intensity. Sand wave emerges when u/uc is 2.0 and extends with increasing flow intensity. Sand waves reach their maximum height when u/uc is 2.6. Finally

particle composition in the same part of different sand waves is similar. In conclusion

with the same density and shape

natural sand wave and model sand wave correspond to the similarity law in a normal mold when incipient motion is taken into consideration.