The geologic record of Hurricane Irma in a Southwest Florida back-barrier lagoon

The geologic record of Hurricane Irma in a Southwest Florida back-barrier lagoon
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佛罗里达州西南部后屏障泻湖飓风艾尔玛的地质记录

DOI:
10.1016/j.margeo.2021.106635
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发表时间:
2021
期刊:
影响因子:
2.9
通讯作者:
Muller, Joanne
Muller, Joanne
中科院分区:
地球科学2区
文献类型:
--
作者:
Martin, Tynisha;Muller, Joanne

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2017年9月10日,三级飓风厄玛沿着佛罗里达州西南海岸线从塞布尔角(Cape Sable)和罗马诺角(Cape Romano)登陆。这场风暴的地质证据保存在Big Hickory Barrier Island后面的屏障泻湖中,该岛屿位于登陆点以北约64公里处,位于墨西哥湾以东43-65米处。现代沙丘高度约为0.83-0.88米,风暴潮(记录高度为0.9-1.5米)超过了这一高度,使沉积物沉积在大山核桃岛泻湖。由于靠近墨西哥湾和浅水屏障本身,可能在该位置发现地质证据。三个核心进行了分析,水分,无机物含量,粒度,有孔虫组合。在所有岩心的最上层,飓风特征(风暴岩)的存在是明显的,包括在有机物和细粒沉积物背景下中砂到粘土的向上变细趋势。风暴层较厚的海滩较窄的部分后面,表示优惠的背障沉积狭窄的障碍部分后面。风暴岩沉积物中的几种不同有孔虫物种证实了海洋沉积物的起源。此外,历史卫星图像显示,大山核桃屏障岛非常容易受到地貌变化的影响,特别是由于风暴的影响。这项研究表明,在了解飓风的历史和屏障岛的脆弱性的效用后屏障沉积物芯。
On 10 September 2017, Category 3 Hurricane Irma made landfall along the Southwest Florida coastline between Cape Sable and Cape Romano. Geologic evidence of this storm is preserved in a back-barrier lagoon behind the Big Hickory Barrier Island, which is located ~64 km north of the landfall point and is positioned 43–65 m east of the Gulf of Mexico. Modern dune height is ~0.83–0.88 m, which was exceeded by the storm surge (recorded height 0.9–1.5 m) allowing for sediment deposition in the Big Hickory Island Lagoon. Geologic evidence is likely found at this location due to proximity to the Gulf of Mexico and the shallow barrier itself. Three cores were analyzed for moisture, inorganic content, grain size, and foraminiferal assemblages. The presence of a hurricane signature (tempestite) is evident in the uppermost horizon of all the cores and includes a fining upward trend of medium sand to clay against a background of organics and fine-grained sediments. Tempestite layers were thicker behind narrower sections of the beach, indicating preferential back-barrier deposition behind narrow barrier sections. Several different foraminiferal species within the tempestite sediments corroborate a marine sediment origin. In addition, historic satellite imagery shows that the Big Hickory Barrier Island is very susceptible to geomorphological change through time, especially due to storm impacts. This research demonstrates the utility of back-barrier sediment cores in understanding hurricane history and barrier island vulnerability.
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