Hurricane Isaac Storm Surge Sedimentation

飓风艾萨克风暴潮沉积

• 批准号: 1263492
• 负责人: Harry Williams
• 金额: $ 1.88万
• 依托单位: University of North Texas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-11-01 至 2014-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1263492&HistoricalAwards=false
• 关键词: Hurricane; Isaac; Storm; Surge; Sedimentation

Sediment deposited during hurricanes is a little-studied but potentially important contributor to long-term coastal marsh aggradation. Studies of modern hurricane storm surge deposits are needed to quantify the impact of hurricanes on long-term marsh sedimentation rates, and to inform interpretations of prehistoric hurricane deposits. This Rapid Response project will make use of recent storm surge deposits associated with Hurricane Isaac, a Category 1 storm that impacted the U.S. Gulf Coast in August 2012. Sampling transects will be established at sites of storm surge sedimentation that vary in distance from the hurricane landfall location. Excavation pits along transects will be stratigraphically described and sampled to determine the magnitude, distribution, and characteristics of the storm surge deposits. To place the deposits in the context of long-term marsh sedimentation rates, underlying sediments will be dated in increments using Cesium-137. Transects will be revisited after a year to characterize the incorporation of the deposits into the marsh. The project will build upon related NSF-funded studies recently conducted by the principal investigator. Results of this research will aid interpretations of hurricane deposits in the sedimentary record, which contribute significantly to assessments of hurricane recurrence intervals, long-term trends in hurricane activity, and associated risk to coastal inhabitants. The potential involvement of a graduate student will include training in sampling and analysis, presentation and publication of results, and incorporation of the research into a Master?s thesis.

飓风期间沉积的沉积物很少被研究，但对沿海沼泽的长期淤积有潜在的重要贡献。需要对现代飓风风暴潮沉积进行研究，以量化飓风对沼泽长期沉积率的影响，并为史前飓风沉积的解释提供信息。这个快速反应项目将利用最近与飓风艾萨克有关的风暴潮沉积物，艾萨克是2012年8月影响美国墨西哥湾沿岸的1级风暴。将在距飓风登陆地点不同距离的风暴潮沉积地点建立采样样点。将对横断面上的开挖坑进行地层描述和取样，以确定风暴潮沉积的规模、分布和特征。为了将沉积物置于长期沼泽沉积速率的背景下，将使用铯-137对底层沉积物进行增量测年。横断面将在一年后重新考察，以表征沉积物融入沼泽的情况。该项目将建立在国家科学基金会资助的首席调查员最近进行的相关研究的基础上。这项研究的结果将有助于解释沉积记录中的飓风沉积，这对评估飓风复发间隔、飓风活动的长期趋势以及沿海居民面临的相关风险有很大贡献。研究生的潜在参与将包括采样和分析方面的培训，结果的陈述和发布，以及将研究纳入S硕士论文中。