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以实体模型概化水槽为基础,研究水深、含沙量及泥沙级配等因素对滩槽泥沙粒径分布的影响.复式河道滩槽泥沙粒径的分布一般具有进口悬沙粒径大于出口悬沙粒径、主槽床沙粒径大于滩地床沙粒径、主槽悬沙粒径大于滩地悬沙粒径以及床沙粒径大于悬沙粒径等基本特征;滩槽床沙粒径比随滩槽相对水深的增加而增加,但滩槽悬沙粒径比随相对水深的变化不大;滩槽床沙粒径比随着含沙量的增加而减小,粗颗粒泥沙的减小幅度要比细颗粒泥沙大,而滩槽悬沙粒径比随含沙量变化不大;滩槽悬沙粒径比及床沙粒径比均随着来沙粒径的增大而减小,滩槽床沙粒径比的变化幅度要大于悬沙粒径比的变化幅度.通过分析滩槽泥沙粒径分布的主要影响因素,建立了相应的经验公式.
Based on the solid model generalized sink, the effects of water depth, sediment concentration and sediment gradation on the sediment particle size distribution of beach and trough are studied.The distribution of sediment particle size in the multicycle channel beach channel generally has the characteristics of suspended sediment diameter Which is larger than the diameter of the outlet suspended sediment. The bed size of sand in the main channel is larger than that of the beach, the size of the suspended sediment in the main channel is larger than that of the suspended sediment in the beach and the particle size of bed sand is larger than that of suspended sediment. The particle size ratio increases with the increase of the relative water depth of the trough, but the particle size ratio of the sand trough with little change with the relative water depth. The bed-diameter ratio of the trough decreases with the increase of the sediment concentration. The decrease of sand is larger than that of fine sediment, while the ratio of sediment of sand beach is not changed with the content of sediment; the ratio of sediment to sediment and the ratio of bed to sand are both with the sand size Increases and decreases, the variation range of sediment bed diameter ratio is larger than that of suspended sediment. By analyzing the main influencing factors of sediment particle size distribution, the corresponding empirical formula is established.