Study On Scour Depth On Jiangdu Sima Bend Of The Yangtze River

The natural channel is always curved. So it exist the second circulation. Which made the water and sediment delivery different from straight channel .Based on the laws for incipient motion for non-uniform and no cohesive sediment. The main achievements as follows:1. Based on the study made by others. Made stress analysis of the single sediment. Take the interaction force of non-uniform sediment as consideration. The formula of incipient motion for non-uniform and non-cohesive has been obtained. This formula has been used to calculate the condition of Si-Ma channel on the lower reaches of Yangtze River in JiangSu Province.2. Wang pin Yi has given the formula for velocity distribution of curved bed channel. His formula has divided the investigated channel into two regions. There are inner bank region and outer bank region. Based on his formula. this article has calculated the velocity distribution in SiMa channel.3. This article has considerate not only the secondary currents but also the interaction force for non-uniform and non-cohesive sediment. The formula for calculating incipient motion for non-uniform and non-cohesive sediment in curved bed channel has been put award.4. By means of the results of incipient motion for non-uniform and non-cohesive sediment in curved bed channel. This article has calculated the erosion depth.