Study on Effect of Starting Works Dredging River and Strengthening Dike on Deposition Reduction in the Narrow Reach of the Lower Yellow River

According to the observed data of starting works dredging river and strengthening dike in narrow reach of the lower Yellow River in 1997, the effect of dredging river on erosion-deposition variation in the channel and regulation of water surface profile is analyzed.The results show that the dredging river has a good effect on reducing channel's deposition and lowering flood stage in a certain period and a certain reach.The basic concept of effect on dredging sediment for deposition reduction is discussed also.