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

基本信息

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

项目摘要

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.

该项目通过研究沿海地带的暖水和冷水对离岸流的可能改变来增进对近岸环境的了解。该项目将研究由不同类型的风和波浪引起的这种变化。研究将仔细审查现有数据和数学模型的结果。分析将离岸流行为置于考虑改变洋流的不同力的框架中。该研究将为冲浪者和游泳者以及沿海地区管理者提供有用的信息，以确定海滩地区从破浪后面到海岸线的污染物的命运。总的来说，这项研究将通过改善海滩地区的安全来造福社会。它将支持一名早期职业科学家和一名博士后学者。该项目将研究与离岸流和相应流量相关的近岸浮力羽流。该研究将探讨浮力水域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。研究将把红外机载和现场观测（现有）与理想化的 COAWST 数值模型结合起来。该研究将寻求确定羽流浮力对比对a）驱动离岸流和b）建立跨大陆架质量交换的相对影响。通过确定这种相对影响，该研究将扩展有关测深相关离岸流的知识。这项工作旨在将数值结果置于考虑弗劳德和辛普森无量纲数参数空间的动态框架中。作为更广泛的影响，该研究将解决浮力效应对离岸流的影响，这一点以前一直被忽视。作为更广泛的影响，该研究将包括培训一名博士后学者和一名本科生，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智力价值进行评估，被认为值得支持以及更广泛的影响审查标准。