Multi-proxy characterization of storm deposits on Sanibel Island, Florida: A modern analog for paleotempestology
Multi-proxy characterization of storm deposits on Sanibel Island, Florida: A modern analog for paleotempestology
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佛罗里达州萨尼贝尔岛风暴沉积物的多代理表征：古风暴学的现代模拟
DOI：
10.1016/j.geomorph.2022.108148
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发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Ellis, Shelby
中科院分区：
文献类型：
--
作者：
Muller, Joanne;Ercolani, Christian;Collins, Jennifer;Ellis, Shelby
飓风对人的生命和基础设施造成严重影响，特别是风暴潮和降水造成的洪水。由于世界日益变暖，为了更好地为沿海人口应对未来的飓风做好准备，更好地了解飓风风暴潮是关键。佛罗里达西南部特别容易受到飓风风暴潮的影响，那里的大部分海岸线距离海平面都在2.5米以内，人口正在增加（李县2019年至2020年间增加了2.5%）。这项研究提出了一个强烈的飓风袭击的地质记录从萨尼贝尔岛追溯到大约。1920年。基于沉积代理，如粒度，有机质，水分含量和碳酸钙，三风暴岩从萨尼贝尔岛沼泽的核心确定。放射性测年法确定风暴1号为1960年的飓风唐娜，风暴2号和风暴3号为1926年的大迈阿密飓风和1921年的坦帕湾飓风。在1920年至2016年间发生的8次强烈飓风（3-5级）中，只有3次飓风被记录在地质记录中。风暴岩1、2和3是由具有显著风暴潮的强烈大半径风暴沉积的，这表明在1920-1960年期间至少有三场风暴对西南佛罗里达地区产生了重大影响。自1960年以来，没有任何风暴突破萨尼贝尔岛屏障。重要的是，公众要认识到，尽管该地区在过去60年中没有经历过显著的风暴潮，但1920年至1960年期间发生的几次飓风产生的风暴潮超过10英尺。能够突破一个主要的屏障岛（萨尼贝尔岛）。预计人类引起的气候变化将增加佛罗里达西南部的风暴强度和海平面上升，并伴随着未来风暴潮的风险。
Hurricanes have serious impacts on human lives and infrastructure, especially as a result of flooding caused by storm surge and precipitation. To better prepare coastal populations for future hurricanes due to an increasingly warming world, a better understanding of hurricane storm surge is key. Southwest Florida is particularly vulnerable to hurricane storm surge where most of the coastline is within 2.5 m of sea level and population is on the rise (2.5% between 2019 and 2020 in Lee County). This study presents a geologic record of intense hurricane strikes from Sanibel Island dating back to approximatelyca.1920. Based on sedimentary proxies such as grain size, organics, moisture content, and calcium carbonate, three tempestites were identified in cores from the Sanibel Island Marsh. Radiometric dating constrained Tempestite 1 as Hurricane Donna (1960) and Tempestites 2 and 3 as the 1926 Great Miami Hurricane and the Tampa Bay hurricane of 1921. Of the eight intense hurricanes (category 3–5) taking place between ~1920–2016, only three hurricanes were recorded in the geologic record. Tempestites 1, 2, and 3 were deposited by intense, large radius storms with significant storm surge, which would indicate that at least three storms made significant impact on the Southwest Florida region between ~1920–1960. Since 1960 no storms have breached the Sanibel Island barrier. It is important for the public to recognize that even though this region has not experienced significant storm surge in the last ~60 years, several hurricanes occurring between 1920 and 1960 produced storms surges greater than ~10 ft. that were able to breach a major barrier island (Sanibel Island). Human-induced climate change is predicted to increase storminess and sea level rise in Southwest Florida with concomitant risk for future storm surge.
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