Doctoral Dissertation Research: Reconstructing Hurricane Activity in the Northern Gulf of Mexico: A Multi-Proxy Approach Using Biomarkers and Stable Isotopes

博士论文研究：重建墨西哥湾北部的飓风活动：使用生物标记物和稳定同位素的多代理方法

• 批准号: 1735723
• 负责人: Kam-biu Liu
• 金额: $ 1.58万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2020-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1735723&HistoricalAwards=false
• 关键词: Doctoral; Dissertation; Research; Reconstructing; Hurricane

This doctoral dissertation research will utilize multiple sedimentary and organic geochemical proxies to develop a high-resolution record of past hurricane activity at two sites on the northern coast of the Gulf of Mexico. The research will provide a better understanding about the hydrologic processes that influence deposition during hurricanes, as well as serve a proxy for marine incursion events independent of overwash sand layers. When applied on a regional level, the research has the potential of providing new mechanisms for investigating past storm activity in regions that presently lack paleohurricane reconstructions. Findings from this research will be used for coastal management and risk assessment, and will be directly relevant to environmental managers, community planners and coastal emergency management officials. As a Doctoral Dissertation Research Improvement award, this award will provide support to enable a promising student to establish a strong independent research career.Reconstruction of past hurricane activity is largely reliant on sedimentary proxies of overwash due to hurricane storm surge. A primary objective of this project is to develop a new proxy of pre-historic hurricane activity by determining the source(s) of organic matter associated with hurricane overwash deposits. The project will collect sedimentary cores and perform multiple laboratory analyses including chronological, sedimentary, geochemistry, isotopic and biomarker analysis. The combination of stable isotope and biomarker analyses would provide a sensitive indicator of storm events and will be used to assess whether such overwash deposits contain organic matter derived from marine sources. This method will also provide information about the complex interactions of storm surge and in-shore flooding processes which are not yet well understood. Determining the relationships between these processes is necessary for predicting the response of coastal environments to future storm impacts, and are important considerations for coastal resource management.

这项博士论文研究将利用多种沉积和有机地球化学代理来开发墨西哥湾北海岸两个地点过去飓风活动的高分辨率记录。 该研究将更好地了解影响飓风期间沉积的水文过程，并为独立于冲刷沙层的海洋入侵事件提供代理。 当应用于区域层面时，该研究有可能为调查目前缺乏古飓风重建的地区过去的风暴活动提供新的机制。 这项研究的结果将用于沿海管理和风险评估，并将与环境管理者、社区规划者和沿海应急管理官员直接相关。 作为博士论文研究改进奖，该奖项将为有前途的学生建立强大的独立研究生涯提供支持。过去飓风活动的重建在很大程度上依赖于飓风风暴潮造成的过度冲刷的沉积代理。该项目的主要目标是通过确定与飓风过度沉积物相关的有机物来源，开发史前飓风活动的新指标。该项目将收集沉积岩芯并进行多项实验室分析，包括年代学、沉积、地球化学、同位素和生物标志物分析。 稳定同位素和生物标志物分析的结合将提供风暴事件的敏感指标，并将用于评估此类溢出沉积物是否含有来自海洋的有机物。 该方法还将提供有关风暴潮和近岸洪水过程的复杂相互作用的信息，这些信息尚未得到很好的理解。确定这些过程之间的关系对于预测沿海环境对未来风暴影响的响应是必要的，也是沿海资源管理的重要考虑因素。

项目成果

Hurricanes as a Major Driver of Coastal Erosion in the Mississippi River Delta: A Multi-Decadal Analysis of Shoreline Retreat Rates at Bay Champagne, Louisiana (USA)

飓风是密西西比河三角洲海岸侵蚀的主要驱动力：美国路易斯安那州香槟湾海岸线退缩率的数十年分析

• DOI: 10.3390/w10101480
• 发表时间: 2018-10
• 期刊: Water
• 影响因子: 3.4
• 作者: Dietz, Marianne;Liu, Kam;Bianchette, Thomas
• 通讯作者: Bianchette, Thomas