Dynamics of Well-Mixed Estuaries
混合良好河口的动力学
基本信息
- 批准号:1634480
- 负责人:
- 金额:$ 67万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2016
- 资助国家:美国
- 起止时间:2016-09-01 至 2020-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Mixing between fresh and salt water is the fundamental process that is common to all estuaries. However well-mixed estuaries present an intriguing paradox: how can mixing occur if the estuary is already mixed? This project addresses that paradox and how it relates to the broader problem of estuarine dispersion in the examination of two well-mixed estuaries with similar tidal and freshwater forcing but highly contrasting geometries, one a narrow estuary with a single, uniform channel and the other a broad lagoon-type estuary with a complex, dendritic channel network. The study will address the coupled momentum and salt balances of these two estuaries with a combination of intensive field measurements and high-resolution numerical modeling. The mixing and exchange processes affecting well-mixed estuaries are fundamentally important to the ecology and life histories of nearshore organisms, to the biogeochemistry (including the carbon budget) of coastal environments, and to the morphodynamic stability of coastal embayments. The results of this study will thus inform research and management related to marine resource management, carbon sequestration, and coastal sustainability. The project will focus a large fraction of its resources on the training of a graduate student. It also includes support for a field methods short-course to provide training for students from different graduate programs in advanced estuarine field methods.Whereas the dynamics of partially mixed and highly stratified estuaries have a firm theoretical framework, well-mixed estuaries are subject to a wide range of hypothesized regimes, such as lateral shear dispersion, chaotic advection and tidal-asymmetry-induced circulation, but with no consistent synthesis or scaling of these different processes. In the case of the narrow estuary, mixing is hypothesized to result from brief, episodic restratification events localized in space and time. For the broad estuary mixing may exhibit a much more complex spatial structure, dominated by lateral fronts at the edges of the channels and intensified at channel junctions. This study will examine the roles of these different mechanisms in well mixed estuaries with strongly contrasting geometries, using observations and realistic simulations to identify the processes, and using model sensitivity studies with varying geometries to parameterize the scaling of the different mechanisms and to generalize the results.
淡水和咸水的混合是所有河口共同的基本过程。然而,混合良好的河口提出了一个耐人寻味的悖论:如果河口已经混合,混合如何发生?本项目探讨了这一悖论及其与河口扩散这一更广泛的问题之间的关系,对两个混合良好的河口进行了研究,这两个河口具有相似的潮汐和淡水强迫,但几何形状截然不同,一个狭窄的河口有一个单一、统一的航道,另一个宽阔的泻湖型河口具有复杂的树枝状航道网络。这项研究将结合密集的现场测量和高分辨率的数值模拟,研究这两个河口的动量和盐分的耦合平衡。影响混合良好的河口的混合和交换过程对近岸生物的生态和生活史、沿海环境的生物地球化学(包括碳收支)和沿海海湾的地貌动力稳定性至关重要。因此,这项研究的结果将为与海洋资源管理、碳封存和沿海可持续性有关的研究和管理提供参考。该项目将把很大一部分资源集中在研究生的培训上。它还包括支持现场方法短期课程,为不同专业的学生提供高级河口现场方法的培训。由于部分混合和高度分层的河口的动力学具有坚实的理论框架,良好混合的河口受到广泛的假设制度的影响,如横向剪切扩散、混沌平流和潮汐不对称诱导的环流,但这些不同过程没有一致的合成或尺度。在狭窄的河口的情况下,混合被认为是空间和时间上局部的短暂的、幕式的再层化事件的结果。对于宽阔的河口,混合可能呈现出复杂得多的空间结构,在航道边缘以侧锋为主,在航道交界处混合加剧。这项研究将考察这些不同机制在具有强烈对比的几何形状的良好混合河口中的作用,使用观测和现实模拟来确定过程,并使用不同几何形状的模型敏感性研究来参数化不同机制的比例并推广结果。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Flow Separation and Increased Drag Coefficient in Estuarine Channels With Curvature
具有曲率的河口河道中的水流分离和阻力系数增加
- DOI:10.1029/2020jc016267
- 发表时间:2020
- 期刊:
- 影响因子:0
- 作者:Bo, Tong;Ralston, David K.
- 通讯作者:Ralston, David K.
Reversed Lateral Circulation in a Sharp Estuarine Bend with Weak Stratification
弱层结河口急弯处的逆侧向环流
- DOI:10.1175/jpo-d-18-0175.1
- 发表时间:2019
- 期刊:
- 影响因子:3.5
- 作者:Kranenburg, Wouter M.;Geyer, W. Rockwell;Garcia, Adrian Mikhail;Ralston, David K.
- 通讯作者:Ralston, David K.
Tidal dispersion in short estuaries
- DOI:10.1029/2022jc018883
- 发表时间:2023-02
- 期刊:
- 影响因子:0
- 作者:Adrian Mikhail;Palaci Garcia;W. Geyer
- 通讯作者:Adrian Mikhail;Palaci Garcia;W. Geyer
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{{ truncateString('Wayne Geyer', 18)}}的其他基金
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
- 批准号:
2123002 - 财政年份:2021
- 资助金额:
$ 67万 - 项目类别:
Standard Grant
Collaborative Research: Using Salinity Variance to Link Estuarine Mixing and Exchange Flow
合作研究:利用盐度方差将河口混合和交换流联系起来
- 批准号:
1736539 - 财政年份:2017
- 资助金额:
$ 67万 - 项目类别:
Standard Grant
Coastal SEES (Track 2), Collaborative: Toward Sustainable Urban Estuaries in the Anthropocene
沿海 SEES(轨道 2),协作:迈向人类世的可持续城市河口
- 批准号:
1325136 - 财政年份:2013
- 资助金额:
$ 67万 - 项目类别:
Continuing Grant
Collaborative Research: Frontogenesis and Fine-Sediment Trapping in a Highly Stratified Estuary
合作研究:高度分层河口的锋生和细泥沙捕获
- 批准号:
1232928 - 财政年份:2012
- 资助金额:
$ 67万 - 项目类别:
Standard Grant
Collaborative Research: The dynamics of sediment-laden river plume and initial deposition off small mountainous rivers
合作研究:富含沉积物的河流羽流动力学和山区小河流的初始沉积
- 批准号:
0926427 - 财政年份:2009
- 资助金额:
$ 67万 - 项目类别:
Standard Grant
Collaborative Research: Quantifying Stratified Turbulence in Estuaries
合作研究:量化河口层状湍流
- 批准号:
0824871 - 财政年份:2008
- 资助金额:
$ 67万 - 项目类别:
Standard Grant
SGER: Proposed Proof-of-Concept Measurements of Turbulent Buoyancy Flux Using the Mast
SGER:建议使用桅杆进行湍流浮力通量的概念验证测量
- 批准号:
0729547 - 财政年份:2007
- 资助金额:
$ 67万 - 项目类别:
Standard Grant
Collaborative Research: Large Eddy Simulations of Estuarine Mixing
合作研究:河口混合的大涡模拟
- 批准号:
0451740 - 财政年份:2005
- 资助金额:
$ 67万 - 项目类别:
Standard Grant
Influence of Estuarine Topography on Longitudinal Dispersion
河口地形对纵向扩散的影响
- 批准号:
0452054 - 财政年份:2005
- 资助金额:
$ 67万 - 项目类别:
Continuing Grant
Collaborative Research: Lagrangian Studies of Secondary Circulation and Mixing in a Stratified Channel
合作研究:分层通道中二次循环和混合的拉格朗日研究
- 批准号:
0095972 - 财政年份:2001
- 资助金额:
$ 67万 - 项目类别:
Continuing Grant
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