珠江河口底边界层湍流积分尺度研究  

Research of turbulent flow integral length scale on the bottom boundary layer in the Pearl River

作　　者：刘欢[1] 吴超羽[2] 许炜铭[1] 

机构地区：[1]中山大学工学院力学系,广东广州510275 [2]中山大学近岸海洋研究中心,广东广州510275

出　　处：《海洋工程》2008年第4期125-131,共7页The Ocean Engineering

基　　金：国家自然科学基金资助项目(40176026;40331007;40676056;10772204);"973"资助项目(2002CB412407)

摘　　要：介绍湍流积分尺度的几种常用计算方法。基于三组珠江口崖门的湍流观测资料,分别计算了一个潮周期内珠江口底边界层湍流积分尺度的变化,并对比不同计算方法的稳定性。计算结果表明,基于Taylor假定的自相关函数积分法的计算结果稳定可靠。湍流积分尺度在一个潮周期内的变化很大,积分尺度的变化与平均流的流速变化有着很好的对应关系,三个测次纵向、横向和垂向积分尺度的平均值分别约为4.9～10.4 cm3、.3～6.2 cm和4.3～5.2 cm。In this paper, several calculation methods for turbulent flow integral length scale are presented. The turbulent flow integral length scale in a tidal cycle is studied based on the three sets of data of Yamen in the Pearl River, and the stabilization of the calculation methods is investigated. The results show that the method of integration of auto-correlation function based on Taylor hypothesis is the most steady and most reliable. The turbulent flow integral length scale changes obviously in a tidal cycle, which correlates well with current velocity. The average of turbulent flow integral length scale in longitudinal, horizontal and vertical measurement is 4.9 ～ 10.3cm, 3.3 ～ 6.2cm and 4.3～ 5.2cm.

关 键 词：底边界层 湍流 积分尺度 珠江河口 

分 类 号：P736[天文地球—海洋地质]