摘要
挟沙水流中的泥沙颗粒因水流紊动而悬浮,同时受重力作用而下沉。由于水流中的泥沙颗粒会对水流紊动产生影响,反之,水流紊动也对泥沙颗粒分布产生影响,它们之间作用是相辅相成的。本文采用超声流速仪(M icroADV)量测挟沙水流的时均流速沿垂向分布,同时对泥沙颗粒粒径的分布进行了试验,研究了泥沙颗粒粒径d50和水流紊动强度在沿垂向分布之间的内在联系,结果表明:泥沙颗粒粒径和紊动强度沿垂线的分布一致性较好,并用实测资料对他们进行了拟合,建立了它们之间的关系式,有一定的实用价值。
Sediment particles is suspended in the sediment-laden flow because of the flow turbulence, and settle down due to gravity action. The flow turbulence is effected by sediment particle, whereas the distribution and transportation of sediment particle is effected by the flow turbulence too. In this paper, MicroADV was applied to measure the distribution of time-mean velocity along the lines of vertical in sediment-laden flow. At the same time, the variational law along depth of distribution of sediment particle size is analyzed. In the link between sediment particles median size diameter d50 and flow turbulence was studied in detail. The results show that the correlation between sediment particle size and the flow turbulence ir better along water depth. Through fitting to them by surveying data, the relational expression about them was established.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2006年第5期679-684,共6页
Chinese Journal of Hydrodynamics
基金
973项目(2003CB415205)
国家自然科学基金项目(50479036)
湖北省创新群体基金项目(2003ABA195)
博士点基金项目(20020486017)资助
关键词
挟沙水流
泥沙颗粒
浓度
粒径
水流紊动
MICROADV
sediment-laden flow
sediment particles
sediment concentration
sediment partic turbulence intensity
MicroADV
