波浪作用下涡动沙纹床面的悬沙运动数值研究  

Numerical study on suspended sediment movement in wave boundary layers over rippled bed

作　　者：蒋昌波[1] 白玉川[2] 赵子丹[2] 张红武[3] 

机构地区：[1]长沙交通学院,湖南长沙410076 [2]天津大学建工学院,天津300072 [3]清华大学水电系,北京100084

出　　处：《水利学报》2003年第3期93-97,103,共6页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助(59809006和10202003)

摘　　要：作者建立了波浪作用下的立面二维水沙数值模型,并对涡动沙纹床面的悬沙运动进行研究。结果表明:悬沙颗粒的沉降速度较小时,其运动受到涡动力特性的影响比较显著。而且在沙纹波峰断面和沙纹波谷断面,半个周期里都可以观察到两个悬沙分布的峰值,主要是由于流动分离形成分离涡,涡运动携带泥沙颗粒而出现峰值。计算成果在一定程度反映了涡动结构对悬沙运动的影响。The authors established a model of the distribution of suspended sediment by means of a 2D numerical model.For a large settling velocity,the suspended sediment was confined to the vicinity of the bed and its suspension patterns were dominated by local bottom shear stress.For a small settling velocity,the suspension was controlled mainly by the characteristics of vortex.Two suspended sediment movement peaks were observed in the crosssection at the trough and crest during the half period with the second peak being due to the separation bubble taking up the sediment.

关 键 词：波浪边界层 涡动沙纹 悬沙 数学模型 

分 类 号：TV142.3[水利工程—水力学及河流动力学]