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Impact of Hurricane Irene during the Nags Head Beach Nourishment Project

机译：飓风艾琳在纳格斯头海滩滋养项目中的影响

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Hurricane Irene impacted Nags Head, NC, on 27 August 2011 as a Category 1 storm before completion of a 4.6 million-cubic-yard (～3.5 million-cubic-meter) beach nourishment project. With ～85% of the nourishment in place, the hurricane produced extensive profile adjustment but no net loss of sand within the project limits. The principal response of the nourished beach to the storm was overwash of the construc tion berm, minor deposition along the back beach, major erosion and recession of the beach face, and formation of storm bars in shallow water. Surveys after the storm detected over 95% of the nourished volume between the toe of the dune and -10 ft (-3 m) depth contour. This paper gives a brief summary of the Nags Head setting, erosion history, beach nourishment planning and construction, and describes in detail impacts of Hurricane Irene. While Irene was not a supreme test, the storm produced at least three breach inlets near the project area and caused extensive damage to private property and Highway 12, the only artery for access to Cape Hatteras. Wide beaches (whether natural or artificial) were found to have a favorable impact on the storm response. Irene and several subsequent extratropical storms (northeasters) that occurred during final construction of the Nags Head project had the beneficial effect of adjusting the nourished profile to a natural configuration more or less mimicking the native beach. The favorable response to the storm at Nags Head, particularly the negligible losses of nourishment sand, partly reflects the quality of sediment in the borrow source.
机译：艾琳飓风于2011年8月27日以1级暴风雨袭击了北卡罗来纳州的纳格斯海德，随后完成了一项460万立方码（约350万立方米）的海滩养护项目。在营养达到〜85％的条件下，飓风产生了广泛的剖面调整，但在项目范围内没有沙粒的净损失。有营养的海滩对暴风雨的主要反应是建筑护堤的过度冲洗，沿后海滩的少量沉积，海滩面的严重侵蚀和后退以及浅水区暴风雨条的形成。暴风雨后的调查发现，沙丘脚趾与-10英尺（-3 m）深度轮廓之间的营养量超过95％。本文简要介绍了Na头的环境，侵蚀历史，海滩营养计划和建设，并详细描述了飓风“艾琳”的影响。虽然艾琳（Erene）并非一项最高测试，但暴风雨在项目区域附近至少造成三个破口，并严重破坏了私有财产和12号公路（通往哈特拉斯角的唯一通道）。发现宽阔的海滩（无论是天然的还是人工的）对暴风雨的响应都有有利影响。在Nags Head项目的最终建设过程中，发生了艾琳（Erene）以及随后发生的几次温带风暴（northeasters），其有益效果是将营养剖面调整为或多或少模仿天然海滩的自然形态。对纳格斯海德暴风雨的良好反应，特别是营养砂的损失可忽略不计，部分反映了借源中沉积物的质量。

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