Departmental Bulletin Paper 非成層期における沿岸海域の吹送流 : 海底摩擦を考慮した水路モデルとBoxモデル
Wind-driven current in coastal sea in the period of non-stratification : Channel and Box models with the bottom friction

矢幅, 寛  ,  磯田, 豊

65 ( 2 )  , pp.61 - 76 , 2015-08-20 , 北海道大学大学院水産科学研究院
We re-examine the maintenance mechanism for the vortices in steady state, taking into considertion of the dissipation term including bottom stress : τb under the forced conditions with a constant and shear wind stress along the channel axis. In case of channel-topography without the bay-head, the flow pattern according to "dynamic balance" of τs=-τb forms. Therefore, the vortices are never produced even by the vortices supply from uniform wind stress due to the bathymetry torque. We also compare two models based on a single-layer and a multi-layer respectively. In case of closed box-topography, the essential flow pattern of vortices can be explained by "vorticity balance" of curl(τs/H)~-curl(τb/H)(H is a depth), and the divergence term generates the lower mode shelf wave and distorts the position of vortices.

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