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A brief history of beach nourishment in South Carolina

机译：南卡罗来纳州海滩营养简史

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There were ~59 discrete beach-nourishment events along the South Carolina coast between 1954 and 2010. These projects encompassed 17 localities - 62.6 miles - which is ~65 percent of the developed or accessible-park oceanfront in the state (-33.5% of the ocean coast). The total volume of nourishment through 2010 was -44.1 million cubic yards (mcy) for an average fill density of 133.3 cubic yards per foot (cy/ft) of shoreline. The adjusted cost of all projects in 2010 constant dollars (2010$$) was (~)$351 million for an average unit-volume cost of $7.96/cy (2010$$). Nourishment volumes by decade peaked in the 1990s at 20.7 mcy - 47 percent of the total. Between 2000 and 2010, nourishment volumes declined to ~ 12.7 mcy partly due to reduced need following initial restoration efforts at some sites. Six project areas (North Myrtle Beach, Myrtle Beach, Garden City-Surfside Beach, Folly Beach, Hunting Island, and Hilton Head Island), comprising 42.6 miles of coast, have received about 70% of the nourishment volume. Most of these sites have measurably wider beachfront area compared with pre-nourishment conditions. Hilton Head Island, with five events since 1969, has received 10.6 mcy. Three sites (Debidue Beach, Folly spit, and Hunting Island), comprising -7% of the nourished shoreline in South Carolina, have not kept pace with erosion and have lost beachfront area. The volume and cost of nourishment applied over project lengths and time periods yield South Carolina expenditures averaging (~)$39 per foot of shoreline per year (2010$$) [range (~)$7-$107/ft/yr]. The present value of developed oceanfront shoreline in South Carolina is roughly in the range $5,000 to $50,000 per linear foot. Thus, annualized expenditures for areas nourished have averaged well under 1 % of property values.
机译：1954年至2010年之间，南卡罗来纳州沿海地区发生了约59处离散的海滩养护活动。这些项目涉及172.6个英里（62.6英里）的局部地区，占该州已开发或可利用的公园海滨的65％（占州的-33.5％）。海洋海岸）。到2010年，总营养量为-4410万立方码（mcy），海岸线的每英尺（cy / ft）的平均填充密度为133.3立方码。以2010年不变美元（2010 $$）计，所有项目的调整后成本为（〜）3.51亿美元，平均单位体积成本为7.96美元/ cy（2010 $$）。十年来的营养总量在1990年代达到峰值，为20.7兆西里，占总量的47％。在2000年至2010年期间，营养量下降到了约12.7兆西里，部分原因是在一些地点进行了初步恢复工作后需求减少。六个项目区域（北默特尔比奇，默特尔比奇，花园城-海滨海滩，愚蠢海滩，亨特岛和希尔顿黑德岛）占沿海地区42.6英里，获得了大约70％的营养。与营养前条件相比，这些地点中大多数都具有可测的海滨面积。希尔顿黑德岛（Hilton Head Island）自1969年以来举办了五场比赛，迄今已收到10.6英里。占南卡罗莱纳州营养海岸线的-7％的三个地点（迪比杜海滩，愚蠢的吐口水和亨特岛）没有跟上侵蚀的步伐，失去了海滨地区。在项目的持续时间和时间段内应用的营养量和成本使南卡罗来纳州的平均每年每英尺海岸线支出（〜）$ 39（2010 $$）[范围在（〜）$ 7- $ 107 / ft / yr]。南卡罗来纳州已开发的海滨海岸线的现值大约在每线性英尺5,000至50,000美元之间。因此，用于营养区域的年均支出平均远远低于财产价值的1％。

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