The importance of topographic complexity for estuarine dispersion and mixing

地形复杂性对于河口分散和混合的重要性

基本信息

批准号：
2123002
负责人：
Wayne Geyer
金额：
$ 63.25万
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：
2021
资助国家：
美国
起止时间：
2021-09-01 至 2024-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2123002&HistoricalAwards=false
关键词：
importance topographic complexity estuarine dispersion

项目摘要

The project will study the re-distribution of water and its properties in estuaries, and propose simplified parameterizations to represent those processes. Focus will be placed on the re-distribution caused by features of the estuarine geometry: a) meanders in the channel, b) constrictions in cross-sectional area, and c) the shape of the connection to the coastal ocean. The project’s goals will be pursued with field measurements and computer models that explore different forces altering water motions in an estuary, such as tides, river discharge, and morphological features. Analyses will be anchored on a theoretical framework that describes salt transport in estuaries. Findings of this study should provide key connections to processes that determine the water quality and the ecology of estuaries. The study will train two PhD students and include activities that engage local environmental groups.The study will seek to determine the role of topographic features on dispersion, stratification and mixing in shallow and tidally dominated estuaries. Features to be considered include meanders, constrictions, and estuary’s mouth geometry. The objectives will be pursued with field observations at the North River (MA) estuary, idealized numerical simulations, and realistic numerical simulations. Idealized simulations will explore amplitude, shape and longitudinal scale of topographic features, varying the forcing from tides, river discharge and overall geometry. Measurements will combine drone photogrammetry, shipboard measurements, and moorings. Analysis of results, with the approach of Dronkers and van de Kreeke (1986), will provide the “parametrization of the influence of topographic complexity on estuarine dispersion and mixing.” In terms of broader impacts, the proposal would support two graduate students. Graduate students will mentor high school students, and together with the PIs will organize lectures for the North and South Rivers Watershed Association.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.

该项目将研究河口水的重新分配及其特性，并提出简化的参数化来表示这些过程，重点将放在河口几何特征引起的重新分配上：a）河道中的曲流，b。 ) 横截面积的收缩，以及 c) 与沿海海洋连接的形状该项目的目标将通过现场测量和计算机模型来实现，这些模型探索改变河口水运动的不同力量，例如。分析将基于描述河口盐输送的理论框架，该研究将提供与决定河口水质和生态的过程的关键联系。两名博士生，并包括当地环境团体参与的活动。该研究将寻求确定地形特征对浅海和潮汐主导河口的分散、分层和混合的作用，需要考虑的特征包括：这些目标将通过北河 (MA) 河口的实地观测、理想化数值模拟和现实数值模拟来探索不同地形特征的幅度、形状和纵向尺度。潮汐力、河流流量和整体几何形状的测量将结合无人机摄影测量、船上测量和系泊装置分析，并采用 Dronkers 和 van de Kreeke 的方法。（1986）将提供“地形复杂性对河口分散和混合的影响的参数化。”就更广泛的影响而言，该提案将支持两名研究生指导高中生，并与 PI 一起。为南北河流域协会组织讲座。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

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Sources of Drag in Estuarine Meanders: Momentum Redistribution, Bottom Stress Enhancement, and Bend-Scale Form Drag

河口曲流阻力来源：动量重新分布、底部应力增强和弯曲尺度形式阻力

DOI：
10.1175/jpo-d-22-0211.1
发表时间：
2023-07
期刊：
Journal of Physical Oceanography
影响因子：
3.5
作者：
Bo, Tong;Ralston, David K.;Geyer, W. Rockwell
通讯作者：
Geyer, W. Rockwell

High and Variable Drag in a Sinuous Estuary With Intermittent Stratification

间歇性分层的蜿蜒河口的高阻力和多变阻力

DOI：
10.1029/2021jc017327
发表时间：
2021-10
期刊：
Journal of Geophysical Research: Oceans
影响因子：
0
作者：
Bo, Tong;Ralston, David K.;Kranenburg, Wouter M.;Geyer, W. Rockwell;Traykovski, Peter
通讯作者：
Traykovski, Peter

Tidal Dispersion in Short Estuaries

短河口的潮汐扩散