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首页> 外文期刊>Journal of oceanography >Dynamics of estuarine residual circulation in a narrow channel including tidal-nonlinear effects
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Dynamics of estuarine residual circulation in a narrow channel including tidal-nonlinear effects

机译：包括潮汐非线性效应在内的狭窄通道中河口残余循环的动力学

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Numerical modeling of a semienclosed narrow channel demonstrates the dynamical dependency of an estuarine residual circulation (ERC) on tidal amplitudes. The ERC is defined by tidally-averaged current field. The tidally-averaged fields show that the ERC-strength variation is classified into highly stratified, partially stratified and weakly stratified ranges, respectively. The ERC becomes weaker as the tidal amplitude (and hence vertical mixing) increases in the highly and weakly stratified ranges. However, the ERC becomes stronger oppositely in the partially stratified range. The nonlinear forces induced by tides significantly affect the ERC as well as the pressure gradient force due to the freshwater flux and the vertical stress divergence (vertical eddy viscous force). In particular, the tidal stress and tidally-oscillating component of vertical stress divergence are quite important in ERC dynamics. The latter causes the enhancement of ERC in proportion to the vertical mixing in the partially stratified range.
机译：半封闭式窄通道的数值模拟表明，河口残余环流（ERC）对潮汐振幅的动力学依赖性。 ERC由潮流平均电流场定义。潮汐平均场显示，ERC强度变化分别分为高度分层，部分分层和弱分层范围。随着潮汐幅度（以及垂直混合）在高度分层和弱分层范围内增加，ERC会变弱。但是，ERC在部分分层范围内反而变强。由于淡水通量和垂直应力发散（垂直涡流粘性力），潮汐引起的非线性力会显着影响ERC以及压力梯度力。特别是，垂直应力发散的潮汐应力和潮汐振荡分量在ERC动力学中非常重要。后者导致ERC的增强与部分分层范围内的垂直混合成比例。

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