悬移质分选沉降及其在工程上的应用

悬移质泥沙占河流输沙的大部分，由于泥沙的重力作用及水流的紊动混掺的双重作用，悬移质沿垂线的分布呈上稀下浓，上细下粗的规律。在水流的不平衡输沙条件下，趋饱和水流中必然有一部分泥沙沉降落淤，其中较粗的泥沙必然率先沉降，较细的泥沙仍随水流悬浮前进。

Sort Settling of Suspended Load and It''s Engineering Application

The main part of sediment transported by the river flow is the suspended load Under the action of the gravity force on sand particles and turbulent interchange of sediment, the concentration of suspended load along the vertical line is lower and finer in the upper part, and higher and coarser in the lower part Under the non equilibrium sediment transporting, ther e must be a portion of sediment settling and silting on the channel bed in the supersaturated water flow. The coarser parts must settle down first, and different sand grains will have different settling distances Utilizing the sort settling regularity of the suspended load, the form of reservoir sedimentation, the transported percentage of the harmful sediment in silting basin, etc., could be forecasted. Two examples of engineering applications are presented in this paper