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 2D 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 crosssection at the trough and crest during the half period with the second peak being due to the separation bubble taking up the sediment.
出处
《水利学报》
EI
CSCD
北大核心
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)
关键词
波浪边界层
涡动沙纹
悬沙
数学模型
wave boundary layer
vortex ripple
suspended sediment
numerical model