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

  • 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。

     

    Abstract: This paper presents a 3-D current numerical model for the Yangtze River estuary with baroclinic-diagnosis mode in vertical σcoordinate 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.

     

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