泥沙模型的粒径相似比尺问题  

On Similarity Scale of Grain Size of Sediment Model

作　　者：乐培九[1] 

机构地区：[1]交通部天津水运工程科学研究所,天津300456

出　　处：《水道港口》2004年第1期1-6,共6页Journal of Waterway and Harbor

摘　　要：运用相似理论对泥沙模型的粒径比尺进行了分析,提出了推移质、悬移质和全沙模型泥沙粒径相似条件;给出了包括细沙在内的泥沙起动粒径比尺的统一计算式和适用不同流区的悬沙粒径比尺的统一计算式;指出模型砂的起动流速不等于模型的起动流速,需进行比尺效应修正。By similartiy theory,the grain-size scale of sediment model is analyzed and similarity conditions between grain sizes if bed load,suspended load and model sand are presented.Then a unified formula for size scale of sediment starting(including cohesive material)and that for size scale of suspended load suitable for various flow areas is obtained.And finally,it's proposed that scale effect should be modified,as starting velocity of model sand is not equivalent to that of model;and it's also indicated that it's nearly impossible to reach similarity of sediment model.

关 键 词：相似理论 泥沙模型 粒径比尺 泥沙起动 泥沙悬移 

分 类 号：TV142[水利工程—水力学及河流动力学]