Collaborative Research: Hydrologic Dynamics in a Coastal Aquifer During an Extreme Multi-Hazard Coastal Storm

合作研究：极端多灾种沿海风暴期间沿海含水层的水文动力学

• 批准号: 1933010
• 负责人: Britt Raubenheimer
• 金额: $ 28.78万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1933010&HistoricalAwards=false
• 关键词: Collaborative; Research; Hydrologic; Dynamics; Coastal

Coastal population growth has led to coastal water quality impairment from excess input of nutrients and other contaminants. Fresh groundwater flowing from land to the coast and discharging through the seabed to the sea can serve as a significant source of chemicals to coastal surface water, resulting in algal blooms, fish kills, and loss of biodiversity. Beach aquifers provide a valuable ecological service of chemically filtering groundwater contaminants prior to discharge to the ocean. The chemical reactivity of beach aquifers depends on groundwater flow behavior and mixing between fresh water and seawater. The objective of this study is to use field measurements and numerical models to understand the effects of extreme multi-hazard coastal storms (including surge, heavy precipitation, and coastal erosion) on groundwater flow and mixing patterns in beach aquifers. Field observations will be conducted at the Army Corps of Engineers Field Research Facility near Duck, NC. The work will help estimate future nutrient and contaminant release to coastal waters due to more frequent and intense storms, coastal erosion, and sea level rise. The objective of the proposed research is to integrate hydrogeological and physical oceanographic methodologies to obtain new understanding of groundwater dynamics and redox behavior in beach aquifers during severe coastal storms. The proposed study will combine field observations and numerical models to 1) characterize the individual and combined effects of storm surge, extreme precipitation, and coastal morphological change on beach groundwater dynamics, 2) assess aquifer recovery time for different storm and morphological scenarios, and 3) evaluate spatiotemporal patterns of saltwater-freshwater mixing during and after an extreme storm event. This study will take place as part of the DUring Nearshore Event eXperiment (DUNEX) at the Army Corps of Engineers Field Research Facility to leverage meteorological, oceanographic, and geomorphological measurements and logistical support funded by the U.S. Coastal Research Program (USCRP). The study is applicable to coastal managers aiming to 1) assess the ecological value of sandy beaches as moderators of chemical and material fluxes between land and sea, 2) estimate the timing of chemical release to coastal waters during and after coastal storms, 3) predict changes to chemical delivery due to more frequent and intense storms, coastal erosion, and sea level rise, and 4) design post-storm beach nourishment strategies to promote beach aquifer ecological services. The study will integrate with educational opportunities coordinated by USCRP during the experiment, including lectures, hands-on activities for students, coastal professionals, and the public.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

沿海人口的增长导致沿海水质受损，养分和其他污染物的过量输入。新鲜的地下水从陆地流到海岸并从海底排出，可以作为沿海地表水的重要化学物质来源，导致藻类开花，杀死鱼类和生物多样性的丧失。海滩含水层在出院之前提供了化学过滤地下水污染物的宝贵生态服务。海滩含水层的化学反应性取决于地下水流动行为以及淡水和海水之间的混合。这项研究的目的是使用现场测量和数值模型来了解极端多危险的沿海风暴（包括激增，大降水量和沿海侵蚀）对海滩含水层中地下水流量和混合模式的影响。现场观察将在北卡罗来纳州鸭附近的陆军工程兵团实地研究机构进行。这项工作将有助于估算未来的营养和污染物释放到沿海水域，因为风暴，沿海侵蚀和海平面上升。拟议研究的目的是整合水文地质和物理海洋学方法论，以在严重的沿海风暴期间对海滩含水层中的地下水动力学和氧化还原行为获得新的了解。拟议的研究将将现场观察和数值模型结合到1）表征风暴激增，极端降水和沿海形态变化对海滩地下水动力学的个人和综合效果，2）评估不同风暴和形态学情景的含水层恢复时间，以及3）评估盐水时空模式在盐水中和之后发生的盐水量表混合事件。这项研究将在陆军工程兵团实地研究机构的近海事件实验（DUNEX）中进行，以利用美国沿海研究计划（USCRP）资助的气象，海洋学和地貌测量和后勤支持。该研究适用于旨在1）旨在评估沙滩的生态价值作为陆地和海洋之间的化学和物质通量的生态价值，2）估算沿海风暴期间和之后的化学释放时间到沿海水域的时机，3）3）预测由于更频繁而强烈的暴风雨，沿海水平的沿海水平和海洋级别的策略促进了化学范围的变化。这项研究将与USCRP在实验期间协调的教育机会融合，包括讲座，针对学生，沿海专业人员的动手活动和公众。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的审查标准通过评估来进行评估的。

项目成果

Hydraulic Head Fluctuations in an Intermediate Depth Coastal Surface Aquifer

• DOI: 10.1016/j.jhydrol.2023.130017
• 发表时间: 2023-08
• 期刊: Journal of Hydrology
• 影响因子: 6.4
• 作者: R. Housego;B. Raubenheimer;S. Elgar;Ming Zhi Wu