挟沙水流浓度脉动特性研究  

Study on turbulent fluctuation characteristics of temporal signal of sediment concentration in sediment-laden flow

作　　者：林鹏[1] 陈立[1] 叶小云[1] 

机构地区：[1]武汉大学水沙科学教育部重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2002年第2期36-39,共4页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目 (5 0 0 790 18);霍英东青年教师基金项目 (710 70 )

摘　　要：挟沙水流的速度脉动导致了泥沙浓度的脉动 ,文章利用MicroADV超声流速仪信号强度与泥沙浓度之间的关系 ,观测了挟沙水流浓度的脉动特征 ,对浓度脉动信号采用小波分解 ,对比分析了挟沙水流速度脉动与浓度脉动之间的关系 .结果表明 ,无论从微观结构 ,还是外在特征 。The temporal signal of sediment concentration got by MicroADV in sediment_laden flow has been analyzed. By compared with the temporal velocity signal, it has been found that the distribution law of turbulent intensity and power_spectral of concentration are similar with that of velocity. Also the wavelet analysis revealed that the similarity between the sediment concentration and flow velocity on microcosmic structure. It has proved that the turbulence of the flow resulting in the sediment suspension and the fluctuation of the concentration of sediment.

关 键 词：浓度脉动 小波分析 挟沙水流 MICROADV 

分 类 号：TV142.1[水利工程—水力学及河流动力学]