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Construction and performance of six template groins at Hunting Island, South Carolina

机译：南卡罗来纳州亨特岛的六种模板腹股沟的施工和性能

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Hunting Island, South Carolina, a four-mile-long barrier-island state park, has one of the highest erosion rates in the United States, averaging over 20 ft/yr for the past～50 years. After six federal and state nourishment projects (1968 to 2004) failed to keep pace with erosion, officials at the South Carolina Department of Parks, Recreation and Tourism (SCPRT) approved a beach stabilization project involving groins plus nourishment. The final plan called for construction of six groins in three clusters at strategic beach access locations along the largely undeveloped oceanfront. Nourishment was an integral and required part of the plan, because it provided a platform for land-based construction of the groins and a source of sand to accommodate sand trapping. In this mesotidal, moderate wave energy setting, the completed structures had to be ～450 ft long to provide a profile encompassing the design berm width andrnwet-sand beach to low water. Groin spacing in clusters was ～1,200 ft. The template profile followed design guidance by ASCE (1994) and is likely one of the first groin installations in the United States attempting this recommended configuration. The groins were constructed using ASTM A690 steel sheet pile with steel caps. Toe protection was limited to broad, armor-stone mats at the heads of each groin. The structures were designed for low reveal along their lengths. Post-project monitoring confirms that erosion rates have lessened within each groin cluster. However, excess nourishment sand has been lost mainly to the north spit (the principal transport direction in this setting). Downcoast areas have continued to receive sand during the first two years following construction. The quantities of sand retained by the structures are dwarfed by the volumes of sand in the adjacent ebb-tidal deltas.
机译：南卡罗来纳州的亨特岛是一个四英里长的障碍岛州立公园，是美国侵蚀率最高的国家之一，过去50年来平均每年侵蚀20英尺以上。在六个联邦和州的营养项目（1968年至2004年）未能跟上侵蚀的步伐之后，南卡罗来纳州公园，娱乐与旅游部（SCPRT）的官员批准了一项涉及腹股沟加营养的海滩稳定项目。最终计划要求在很大程度上未开发的沿海地区的战略性海滩通道位置，在三个集群中建造六个腹股沟。营养是该计划不可或缺的组成部分，因为它为陆基腹股沟建筑提供了一个平台，并提供了一个沙源来容纳沙子。在中等的中波波能环境下，完成的结构必须长至约450英尺，以提供一个轮廓，包括设计的河道宽度和低水位的湿沙海滩。群集中的腹股沟间距约为1200英尺。模板轮廓遵循ASCE（1994）的设计指南，可能是美国尝试这种推荐配置的首批腹股沟装置之一。腹股沟使用带钢盖的ASTM A690钢板桩建造。脚趾的保护仅限于每个腹股沟顶部的防弹垫。这些结构设计为沿其长度方向的低显露性。项目后的监测证实，每个腹股沟群集内的侵蚀率均已降低。然而，多余的营养沙主要流失到北吐口（在这种情况下是主要的运输方向）。建造后的头两年内，沿海地区继续接受沙子。结构所保留的沙子数量与相邻的潮汐三角洲中的沙子数量相比显得微不足道。

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  • 来源
    《Shore and beach》 |2010年第3期|P.21-2628-32|共11页
  • 作者

    Steven B. Traynum; Timothy W. Kana; David R. Simms;

  • 作者单位

    Coastal Science & Engineering P.O. Box 8056, Columbia, SC 29202;

    rnCoastal Science & Engineering P.O. Box 8056, Columbia, SC 29202;

    rnSouth Carolina Parks Recreation & Tourism 1205 Pendleton Street (246), Columbia, SC 29201;

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