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首页> 外文期刊>Ocean Dynamics >Extreme flows and unusual water levels near a Caribbean coral reef: was this a case of a 'perfect storm'?
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Extreme flows and unusual water levels near a Caribbean coral reef: was this a case of a 'perfect storm'?

机译：加勒比珊瑚礁附近的极端流量和异常水位：这是否是“完美风暴”的案例？

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摘要

Observations of currents aimed to study the flow near a spawning aggregation reef, Gladden Spit off the coast of Belize, reveal unusually strong currents on 19-20 October 2009 (the current speed was over 1 ms~(-1), when the mean and standard deviation are 0.2±0.12 ms~(-1)). Dur-ing this short time, the water level was raised by 60-70 cm above normal in one place, but lowered by 10-20 cm in another location just 2 km away. The temperature dropped by over 2°C within a few hours. Analyses of local and remote sensing data suggest that a rare combination of an offshore Caribbean cyclonic eddy, a short-lived local tropi-cal storm, and a Spring tide, all occurred at the same time and creating a "perfect storm" condition that resulted in the unusual event. High-resolution simulations and momentum balance analysis demonstrate how the unique shape of the coral reef amplified the coastal current through nonlinear flow-topography interactions. The suggested mechanism for the water level change is different than the classical wind-driven storm surge process. The study has implications for the influence of external forcing on mixing processes and physi-cal-biological interactions near coral reefs.
机译：旨在研究产卵的聚集礁附近伯利兹海岸的Gladden Spit附近的水流的观测结果显示，2009年10月19日至20日存在异常强的水流（当前速度超过1毫秒〜（-1），标准偏差为0.2±0.12 ms〜（-1））。在这段短时间内，一个地方的水位比正常高了60-70厘米，而在另一个2公里以外的地方，水位却降低了10-20厘米。温度在几个小时内下降了2°C以上。对本地和遥感数据的分析表明，罕见的加勒比海上气旋涡，短时局部对流风暴和春季潮汐的组合同时发生，并造成了“完美风暴”情况，导致在不寻常的事件中。高分辨率模拟和动量平衡分析表明，珊瑚礁的独特形状如何通过非线性流-地形相互作用来放大沿海流。所建议的水位变化机制与经典的风力风暴潮过程不同。该研究对珊瑚礁附近外来强迫对混合过程和物理-生物学相互作用的影响具有影响。

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