Nearshore plume dynamics: Airborne observations and modeling of surf-shelf exchange

近岸羽流动力学：海陆架交换的机载观测和建模

• 批准号: 2048303
• 负责人: Melissa Moulton
• 金额: $ 69.6万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2048303&HistoricalAwards=false
• 关键词: Nearshore; plume; dynamics; Airborne; observations

This project advance understanding of the nearshore environment by examining possible modifications to rip currents by warm and cold waters along a coastal strip. The project will examine such modifications also caused by different types of winds and waves. Research will scrutinize data already available and results from a mathematical model. Analysis will place rip-current behavior in a framework that considers different forces that modify the currents. The study will provide helpful information for surfers and swimmers, and for coastal zone managers to determine the fate of pollutants in the beach zone, from behind the breaking waves to the coastline. In general, the study will benefit society by improving safety in the beach zone. It will support one early-career scientist and a post-doctoral scholar. This project will study nearshore buoyant plumes related to rip currents and the corresponding flows. The study will explore the connection between buoyant waters and rip currents, and how the connection may change with different stratification conditions and forcing agents: wind, waves, and density gradients. Research will combine infrared airborne and in-situ observations (in hand) with idealized COAWST numerical modeling. The study will seek to determine the relative influence of plume buoyancy contrasts in a) driving rip currents and b) establishing cross-shelf exchange of mass. By determining such relative influence, the study will expand knowledge on bathymetrically related rip currents. This work seeks to place numerical results in a dynamical framework that considers the parameter space of Froude and Simpson non-dimensional numbers. As Broader Impacts, the study will address the influence of buoyancy effects on rip currents, which has been neglected before. Also as Broader Impacts, the study will include training of one post-doctoral scholar and one undergraduate student, and support for an early-career scientist.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.

本项目通过研究沿沿着的暖、冷沃茨对裂流的可能影响，来增进对近岸环境的了解。该项目将研究不同类型的风和波浪引起的此类变化。研究将仔细审查现有数据和数学模型的结果。分析将把撕裂电流的行为在一个框架，考虑不同的力量，修改电流。这项研究将为冲浪者和游泳者提供有用的信息，并为沿海地区管理人员提供有用的信息，以确定污染物在海滩地区的命运，从破碎的波浪后面到海岸线。总的来说，这项研究将通过改善海滩区的安全而造福社会。 它将支持一名早期职业科学家和一名博士后学者。本项目将研究与离岸流和相应流动有关的近岸浮力羽流。这项研究将探讨浮力沃茨和离岸流之间的联系，以及这种联系如何随着不同的分层条件和强迫因素（风、波浪和密度梯度）而变化。研究将结合联合收割机红外机载和现场观测（在手）与理想化COAWST数值模拟。这项研究将设法确定羽流浮力对比在a）驱动裂流和B）建立跨大陆架物质交换方面的相对影响。通过确定这种相对影响，这项研究将扩大有关水深相关的离岸流的知识。这项工作旨在将数值结果的动态框架，认为参数空间的弗劳德和辛普森无量纲数。作为更广泛的影响，这项研究将解决浮力效应对离岸流的影响，这是以前被忽视的。该研究还将包括一名博士后学者和一名本科生的培训，以及对一名早期职业科学家的支持。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

COAWST model simulations of warm and cool nearshore rip-current plumes

COAWST 模型模拟近岸暖流和冷流离岸流羽流

• DOI: 10.5281/zenodo.4272080
• 发表时间: 2020
• 期刊: Zenodo
• 作者: Moulton, Melissa

Warm and Cool Nearshore Plumes Connecting the Surf Zone to the Inner Shelf

连接冲浪区和内陆架的温暖和凉爽的近岸羽流

• DOI: 10.1029/2020gl091675
• 发表时间: 2021
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Moulton, M.;Chickadel, C. C.;Thomson, J.
• 通讯作者: Thomson, J.