长江口斜压诊断模式三维流场数值模拟  

3-D current numerical model for the Yangtze River estuary with baroclinic-diagnosis mode

作　　者：龚政[1] 张长宽[2] 金勇 张东生[2] 

机构地区：[1]水利部太湖流域管理局水利发展研究中心,上海200434 [2]河海大学交通与海洋工程学院,江苏南京210098 [3]上海勘测设计研究院,上海200434

出　　处：《水科学进展》2004年第3期300-306,共7页Advances in Water Science

基　　金：水利部科技创新项目(CSX2000 57);教育部科技研究重点项目(01100)

摘　　要：建立了σ坐标系下长江口斜压诊断模式三维流场数学模型,采用k kl二方程紊流闭合模型求解垂向涡粘系数,计算域内恒定、非均匀盐度场反映了计算域密度斜压效应。验证结果表明,斜压诊断模式的模拟成果较切合实际。模型成功复演了长江口水域由往复流向旋转流过渡的流场特性;潮波从四条汊道传入后在分汊口附近相遇形成多个会潮点,其位置随着径流的大小、潮汐的强弱、汊道的形态等因素而变化。This paper presents a 3-D current numerical model for the Yangtze River estuary with baroclinic-diagnosis mode in vertical σ coordinate system. A vertical eddy-viscosity coefficient is obtained from the advanced k-kl turbulence closure model, and the density baroclinic effects are embodied by the 2-D invariable-uneven salinity field. It shows the results from baroclinic-diagnosis mode well consistent with reality. The transition feature from back and forth current to rotary current is re-acted successfully. In addition, several tidal junction points appeare near branch points when tidal wave propagate from four river forks, the position of which change with runoff, tide and topography.

关 键 词：长江口 斜压诊断模式 三维流场 数值模拟 温度场 

分 类 号：TV131.2[水利工程—水力学及河流动力学]