以辽宁白石水库库区大凌河与牤牛河交汇流河段为例,基于模型试验,研究了干支流不同遭遇洪水所产生淤积量与淤积分布.结果表明,受到水库蓄水、支流牤牛河来沙量较大等因素影响,库区交汇河段发生淤积,而干支流洪水不同遭遇对淤积量及其分布影响十分显著:干支流洪水同时发生时交汇区淤积量最小,淤积主要集中在支流河段,淤积厚度沿程减小;干流洪水先于支流发生时交汇区淤积量最大,淤积厚度沿程先增大后减小;干流洪水晚于支流发生时,淤积发生在干流河道与交汇区内,表现出淤积范围大但厚度较小的特点. Taking the confluence of Daling River and Sui Niu River in Baishi reservoir area of ​​Liaoning Province as an example, the sediment accumulation and siltation distribution in different affected floods of dry tributaries were studied based on model tests. The results show that, The influence of large amount of sediment, sediment and other factors on the sediment concentration in the reservoir area converges. However, the impacts of flood and flood on the sedimentation volume and its distribution are quite significant. The sedimentation volume at the intersected area is the smallest at the same time, In the tributaries reach the river, the siltation thickness decreases along the river course. Before the mainstream flooding, the sedimentation volume in the intersection area is the largest, and the siltation thickness increases first and then decreases along the tributaries. When the main stream flood occurs later than the tributary, siltation occurs in the main channel and intersection , Showing a large range of deposition but the thickness of the smaller features.