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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Wave- and tidally-driven flow and sediment flux across a fringing coral reef: Southern Molokai, Hawaii
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Wave- and tidally-driven flow and sediment flux across a fringing coral reef: Southern Molokai, Hawaii

机译：波浪和潮汐驱动的流和沉积物通量流过边缘珊瑚礁：夏威夷南部莫洛凯

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The fringing coral reef off the south coast of Molokai, Hawaii is currently being studied as part of a US Geological Survey (USGS) multi-disciplinary project that focuses on geologic and oceanographic processes that affect coral reef systems. For this investigation, four instrument packages were deployed across the fringing coral reef during the summer of 2001 to understand the processes governing fine-grained terrestrial sediment suspension on the shallow reef flat (h = 1 m) and its advection across the reef crest and onto the deeper fore reef. The time-series measurements suggest the following conceptual model of water and fine-grained sediment transport across the reef. Relatively cool, clear water flows up onto the reef flat during flooding tides. At high tide, more deep-water wave energy is able to propagate onto the reef flat and larger Trade wind-driven waves can develop on the reef flat, thereby increasing sediment suspension. Trade wind-driven surface currents and wave breaking at the reef crest cause setup of water on the reef flat, further increasing the water depth and enhancing the development of depth-limited waves and sediment suspension. As the tide ebbs, the water and associated suspended sediment on the reef flat drains off the reef flat and is advected offshore and to the west by Trade wind- and tidally-driven currents. Observations on the fore reef show relatively high turbidity throughout the water column during the ebb tide. It therefore appears that high suspended sediment concentrations on the deeper fore reef, where active coral growth is at a maximum, are dynamically linked to processes on the muddy, shallow reef flat. Published by Elsevier Ltd.
机译：目前，作为美国地质调查局（USGS）多学科项目的一部分，正在研究夏威夷莫洛凯岛南部海岸边缘的珊瑚礁，该项目侧重于影响珊瑚礁系统的地质和海洋学过程。为了进行这项调查，2001年夏季，在边缘珊瑚礁上部署了四个仪器套件，以了解控制浅层礁滩（h = 1 m）上细颗粒状陆地沉积物的悬浮过程及其在礁顶和对流层上对流的过程。更深的前礁。时间序列的测量结果表明，以下的水和细粒沉积物在整个礁石中的传输的概念模型。潮潮期间，相对凉爽，清澈的水向上流到礁滩上。在涨潮时，更多的深水波能量能够传播到礁滩上，并且更大的商业风驱动波会在礁滩上发展，从而增加了沉积物的悬浮。贸易风驱动的表面流和礁顶处的波浪破裂导致礁滩上积水，从而进一步增加了水深，并增强了限深波浪和沉积物悬浮的发展。随着涨潮的退潮，礁滩上的水和相关的悬浮沉积物从礁滩上排走，并通过贸易风和潮汐流被平流到海上和西部。在退潮期间，对前礁的观察表明整个水柱的浊度都较高。因此，似乎在活跃的珊瑚生长最大的更深的前礁上的高悬浮沉积物浓度动态地与泥泞的浅礁滩上的过程动态相关。由Elsevier Ltd.发布

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