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珠江河口底边界层憩流动力特征
引用本文:刘欢,吴加学,武亚菊.珠江河口底边界层憩流动力特征[J].海洋工程,2013,31(4):55-61.
作者姓名:刘欢  吴加学  武亚菊
作者单位:1.中山大学 近岸海洋科学与技术研究中心,广州 510275; 2.中山大学 海洋学院,广州 510275;1.中山大学 近岸海洋科学与技术研究中心,广州 510275; 2.中山大学 海洋学院,广州 510275;珠江水利科学研究院,广州 510611
基金项目:国家自然科学基金资助项目(41006050);中山大学青年教师培育资助项目(11lgpy59);中山大学青年教师起步计划
摘    要:通过在珠江黄茅海河口进行的25 h定点连续观测,分析了潮流底边界层在憩流时刻的动力特征。结果表明,憩流期非恒定性增强,改变了平均流和湍流结构。主要表现:1)平均流结构出现三种不同类型,分别是对数分布(摩擦力主导)、垂向均匀分布(惯性主导)和过渡状态(摩擦力和惯性力平衡);2)湍流各向异性增强,湍谱惯性子区带宽减小。各湍流特征参数在转流时刻达到最小值,表明惯性作用抑制了湍流的发育。

关 键 词:底边界层  憩流  动力结构  珠江河口

Dynamic characteristics of bottom boundary layer flows near slack tide in the Pearl River estuary
LIU Huan,WU Jia-xue and WU Ya-ju.Dynamic characteristics of bottom boundary layer flows near slack tide in the Pearl River estuary[J].Ocean Engineering,2013,31(4):55-61.
Authors:LIU Huan  WU Jia-xue and WU Ya-ju
Abstract:The dynamic characteristics of tide induced bottom boundary layer (BBL) flow near slack tide in the Huangmaohai estuary are investigated based on the instrument tripod observations over a tidal cycle. The result shows that as unsteadiness is increased, the mean current and turbulence structures of the BBL flows are greatly modified near slack tide: 1) the structures of mean currents can be classified into three types, i.e. classic logarithmic profile (friction dominated), vertically homogeneous profile (inertia dominated), and a transitional state in between; and 2) turbulence anisotropy is apparently increased, and the bandwidth of the inertia sub range is significantly narrowed. Turbulent parameters in the BBL get their minimum values near slack tide, which means that turbulence is restrained by inertia.
Keywords:bottom boundary layer  slack tide  dynamic structure  Pearl River
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