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California coastal sand retention today:Attributes and influence of effective structures

机译：今日加州沿海砂土保留：有效结构的属性和影响

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摘要

One resource for understanding the successful use of retention structures is the record of existing structure performance. We have created a robust catalog of 211 engineered structures that have the potential to retain sandy beaches along California's 1,760-km open-ocean coastline. These structures include those designed in compliment with beach restoration projects, as well as those for which sand retention is auxiliary to the primary intended purpose. We have systematically documented the location of each structure and described its basic form, function, history, and local coastal setting with the assignment of 25 numerical and categorical attributes collected from historic records and aerial imagery. Areas of sandy beach that have accreted in the proximity of coastal engineering structures have been identified by the comparison of pre-structure and modern shoreline positions. The findings suggest that 15 million m~2, approximately 18%, of California's total exposed sandy beach area is presently retained in and behind fillet and salient beaches associated with anthropogenic structures. A statistical analysis of numerical attributes in our catalog indicates significant correlations between effective sediment retention and shoreline orientation, blocking distance and structure spacing. Net littoral drift rates are not found to be a significant factor in predicting decadal-scale sand retention effectiveness. This statewide record of structure characteristics is a useful tool for future coastal zone management including the use of engineered structures in combination with beach nourishment along high energy shorelines.
机译：记录成功使用保留结构的一种资源是现有结构性能的记录。我们创建了一个强大的目录，其中包含211个工程结构，这些结构可能会保留加利福尼亚州1,760公里的远洋海岸线上的沙滩。这些结构包括为配合海滩修复项目而设计的结构，以及沙粒保留辅助主要目的的结构。我们已经系统地记录了每个结构的位置，并描述了它的基本形式，功能，历史和当地沿海环境，并分配了从历史记录和航拍图像中收集到的25个数字和类别属性。通过比较预制结构和现代海岸线位置，可以确定在沿海工程结构附近堆积的沙滩区域。研究结果表明，目前，在与人为结构相关的圆角和凸滩内外，约有1500万平方米，约占加利福尼亚总裸露沙滩面积的18％。对我们目录中数值属性的统计分析表明，有效沉积物保留量与海岸线定向，阻塞距离和结构间距之间存在显着相关性。沿岸净漂移率未发现是预测年代际尺度的砂retention留效果的重要因素。这种结构特征的全州记录是未来沿海地区管理的有用工具，包括将工程结构与沿高能海岸线的海滩养料结合使用。

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  • 来源
    《Shore and beach》 |2010年第4期|p.64-74|共11页
  • 作者

    Nicole Kinsman; Gary B. Griggs;

  • 作者单位

    Department of Earth & Planetary Sciences, University of California, Santa Cruz 1156 High Street, Santa Cruz, CA 95064;

    rnInstitute of Marine Sciences Department of Earth & Planetary Sciences, University of California, Santa Cruz 1156 High Street, Santa Cruz, CA 95064;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    coastal protection; groin; jetty; breakwater; beach management;

    机译：沿海保护;腹股沟;码头;防波堤海滩管理;

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