长江口正压、斜压诊断及斜压预报模式——三维流场数值模拟

3-D current numerical models of Yangtze Estuary with barotropic mode, baroclinic-diagnosis mode and baroclinic-prediction mode

建立了σ坐标系下长江口正压、斜压诊断及斜压预报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。通过正压模式与斜压诊断模式、斜压诊断模式与斜压预报模式流场模拟结果的定量比较,说明了各种模式对长江口流场模拟精度影响的程度,推荐了长江口流场数值模拟采用的模式。

This paper presents 3-D current numerical models of the Yangtze Estuary with barotropic, baroclinic-diagnosis and baroclinic-prediction modes in vertical σ coordinate system. The vertical eddy-viscosity coefficient is obtained from the advanced k-kl turbulence closure model. Quantitative comparisons between barotropic and baroclinic-diagnosis modes and between baroclinic-diagnosis and baroclinic-prediction modes show different effects of all these modes on the current simulating precision of the Yangtze Estuary. Finally, this paper presents recommended modes for the current numerical modeling of the Yangtze Estuary.