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首页> 外文期刊>Journal of oceanography >Coastal Current on the Eastern Shelf of Hidaka Bay
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Coastal Current on the Eastern Shelf of Hidaka Bay

机译：日高湾东部大陆架上的沿海洋流

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摘要

In order to examine seasonal variation in a coastal current and the dynamics of the current, we carried out a mooring current measurement near the coast on the eastern shelf of Hidaka Bay from December 2002 to July 2003. There seemed to be two current regimes during the observed period; one a southeastward current from December to March, and the other a northwestward current after April. Arrested topographic wave dynamics was used to understand along-shore steady momentum balance at the mooring site. It was found that the friction term was negligible during the former regime, that is, the wind stress term roughly counterbalanced the pressure gradient term. On the other hand, the contribution of each term to the momentum balance was sensitive to the resistance coefficient value during the latter regime. A numerical study showed that wind forcing alone could not reproduce the observed current velocity and momentum balance during the former regime. One possible interpretation of the observed results is superposition of the arrested topographic waves forced by the along-shore wind stress and downstream extension of the Coastal Oyashio. Numerical experiments using combined forcing of the wind stress and an inflow associated with the Coastal Oyashio supported the expected dynamics.
机译：为了研究沿海水流的季节变化和水流的动态，我们在2002年12月至2003年7月的日高湾东海架附近的海岸附近进行了系泊水流测量。观察期一个是从12月到3月的东南海流，另一个是4月之后的西北海流。使用被捕获的地形波动力学来了解系泊地点的沿海稳定动量平衡。发现在前一种状态下摩擦项可以忽略不计，即风应力项与压力梯度项大致抵消。另一方面，在后一种情况下，每个项对动量平衡的贡献对阻力系数值敏感。一项数值研究表明，在前一种状态下，仅靠风力无法重现观测到的当前速度和动量平衡。对观测结果的一种可能解释是，由于沿岸风应力和沿海Oyashio下游延伸而迫使被捕地形波叠加。使用风应力和与沿海Oyashio相关的入流的联合强迫进行的数值实验支持了预期的动力学。

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