Effects of the Gulf Stream on ocean waves
Effects of the Gulf Stream on ocean waves
复制标题
墨西哥湾流对海浪的影响
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
H. Tolman
中科院分区：
文献类型：
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作者：
L. Holthuijsen;H. Tolman
本文采用第三代数值波浪模式，研究了在膨胀和风暴条件下，墨西哥湾流直流和墨西哥湾流环对海浪的影响。该模型考虑了波的传播、产生和耗散的所有相关过程（包括电流效应），而不对波的频谱发展施加先验限制。影响波浪的主要机制似乎是电流引起的折射，尽管入射波的短峰性往往掩盖了它的影响（在膨胀条件下也是如此）。根据风和波浪的情况，折射可能会在直接的墨西哥湾流中捕获本地产生的波浪，或者将波浪能量反射回开阔的海洋。在墨西哥湾流环中，折射引起显著波高和短峰度的较大变化，但对平均波向影响不大。在风暴条件下，逆流情况下产生和消散过程显著增强，顺流情况下减弱。
In the present study a third-generation numerical wave model is used to study effects of a straight Gulf Stream and a Gulf Stream ring on ocean waves in swell and storm conditions. The model accounts for all relevant processes of propagation, generation, and dissipation of the waves (including current effects) without imposing a priori restraints on the spectral development of the waves. The dominating mechanism affecting the waves appears to be current-induced refraction even though the short-crestedness of the incoming waves tends to mask its effects (also in swell conditions). Depending on wind and wave conditions, refraction may trap locally generated waves in the straight Gulf Stream or it may reflect wave energy back to the open ocean. In the Gulf Stream ring, refraction induces a considerable variation in significant wave height and short-crestedness, but it hardly affects the mean wave direction. In storm conditions the processes of generation and dissipation are considerably enhanced in countercurrent situations and reduced following-current situations.