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首页> 外文期刊>Estuarine Coastal and Shelf Science >The influence of wind-driven currents on the circulation and bay dynamics of a semi-enclosed reefal bay, Wreck Bay, Jamaica
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The influence of wind-driven currents on the circulation and bay dynamics of a semi-enclosed reefal bay, Wreck Bay, Jamaica

机译：风流对牙买加Wreck湾半封闭暗礁湾环流和湾动力学的影响

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摘要

Investigations into the descriptive hydrodynamics of a semi-enclosed reefal bay showed that inner bay waters re-circled the reef and particular forcing conditions of wind and tide retarded or enhanced this circulation. Fringing reef parabola, partially enclosing bays, are generally accepted as the limit of the bay dynamics. The dynamics displayed at Wreck Bay, on the southeast coast of Jamaica, however, showed the reef as the heart of main circulation and therefore the centre of the functioning bay. Results from field measurements of the spatial and temporal variability in circulation revealed that inner bay water surging from the back-reef exited quickly through a gap in the reef (channel flow, up to 60 cm s~(-1)), diverged on the fore-reef, then either re-entered the back-reef to become closed circum-reef circulation (CRC), or continued along the fore-reef as open CRC. Variation in the wind regime controlled the relative importance of wind or tides to driving circulation and bay emanation. Wind speeds above 5 m s~(-1) were found to be the dominant forcing factor and, combined with tides, accounted for 60% of the variability in CRC when the sea-breeze developed during early summer and again when the land-breeze strengthened during the winter deployment. Open CRC was extended seawards when channel flow currents displayed occasional surges associated with strong wind-driven currents combined with similar incident wave approach. This led to change in bay dynamics by extreme expansion in bay characteristics. The opposite scenario occurred on rare occasions of low tide with wind calms, when channel flow reversed into the inner bay and flow over the emergent reef was reduced, leading to the most extreme contraction of bay characteristics.
机译：对一个半封闭的暗礁湾的描述性水动力的研究表明，内湾水使珊瑚礁重新环流，风和潮汐的特殊强迫条件阻碍或增强了这种环流。边缘礁石抛物线，部分包围海湾，通常被认为是海湾动力学的极限。然而，在牙买加东南沿海的沉船湾所显示的动态显示，礁石是主要循环的心脏，因此是功能湾的中心。现场对循环时空变化的测量结果表明，从后礁涌动的内湾水通过礁中的缝隙（通道流量，最大60 cm s〜（-1））迅速流出，并在礁上扩散。珊瑚礁，然后要么重新进入礁石，成为封闭的礁石环流（CRC），要么沿着礁石继续开放的CRC。风态的变化控制了风或潮对驱动环流和海湾散发的相对重要性。发现风速高于5 ms〜（-1）是主要的强迫因素，结合潮汐，夏初海风形成时和陆风增强时，CRC的变化率占60％。在冬季部署期间。当通道的水流偶尔出现与强风流相关的浪涌并结合类似的入射波方法时，开放式CRC沿海延伸。通过极大地扩展机架特性，导致了机架动力学的变化。相反的情况发生在极少的潮汐低潮和风平和的情况下，当河道水流倒流进入内湾，而越过涌出的礁石的流量减少时，则导致湾区特征的最极端收缩。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第4期|p.535-544|共10页
  • 作者

    Ava M. Maxam; Dale F. Webber;

  • 作者单位

    Centre for Marine Sciences, Department of Life Sciences, 4 Anguila Close, Faculty of Pure and Applied Sciences, University of the West Indies, Mono Campus, Kingston 7, Jamaica Mona Geoinformatics Institute, Hermitage Road, University of the West Indies, Mono Campus, Kingston 7, Jamaica;

    Centre for Marine Sciences, Department of Life Sciences, 4 Anguila Close, Faculty of Pure and Applied Sciences, University of the West Indies, Mono Campus, Kingston 7, Jamaica;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bay dynamics; channel flow; wind-driven currents; jamaica; wreck bay;

    机译：海湾动力学渠道流量风流;牙买加沉船湾;

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