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Searching for sand in Florida: Exploiting sea floor morphology as a reconnaissance tool

机译：在佛罗里达寻找沙子：利用海床形态作为侦察工具

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摘要

Beach nourishments using Outer Continental Shelf (OCS) sand have increased in size and frequency over the last 20 years. However, locating suitable sand deposits on the OCS is expensive and time-consuming. This study demonstrates that rugosity and slope analysis of existing publicly available data can be a viable reconnaissance tool when searching for OCS sand deposits. Rugosity is a quantitative measure of the pattern of elevation changes; on the sea floor, high rugosity topography includes shoals and reefs. Rugosity grid maps were computed at five scales, from 10 m to 1000 m, and compared to previously verified sand bodies along the southeast Florida coast. Slope was computed at a scale of 10 m. Analysis of the rugosity maps found that the rugosity of sand bodies is two to four times greater than the rugosity of the shelf as a whole and analysis of the slope maps found that the slope of sand bodies is 0.4° greater than the shelf slope. Findings from these results highlight the importance of conducting analysis at the proper scale. These results led to the development of a rugosity-bracketing-slope (RBS) reconnaissance method. Finally, a coarse-scale rugosity grid was used to calculate east Florida shelf sand reserves, resulting in an estimate between 1.5-3 Gm~3 (2-4 bey).
机译：在过去的20年中，使用外大陆架（OCS）沙子提供的海滩营养已经增加了规模和频率。但是，在OCS上定位合适的沙沉积物既昂贵又费时。这项研究表明，在搜索OCS砂矿时，对现有可公开获得的数据进行褶皱度和坡度分析可能是一种可行的侦察工具。粗鲁度是海拔变化模式的定量度量；在海底，高皱纹地形包括浅滩和礁石。在从10 m至1000 m的五个比例尺上计算了Rugosity网格图，并将其与佛罗里达州东南沿海的先前验证的砂体进行了比较。坡度的计算范围为10 m。通过对粗糙度图的分析发现，砂体的粗糙度是整个架子的粗糙度的2至4倍，对坡度图的分析发现，砂体的坡度比架子的坡度大0.4°。这些结果的发现凸显了进行适当规模分析的重要性。这些结果导致了皱纹包围倾斜（RBS）侦察方法的发展。最后，使用粗度的皱纹网格来计算佛罗里达州东部陆架砂的储量，得出的估算值在1.5-3 Gm〜3（2-4贝贝）之间。

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  • 来源
    《Shore and beach》 |2017年第3期|85-95|共11页
  • 作者

    Paul O. Knorr;

  • 作者单位

    Bureau of Ocean Energy Management, Office of Strategic Resources, Marine Minerals Branch 45600 Woodland Road, Sterling, VA 20166;

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