Flows Around Curves in Estuaries: Dynamics and Impacts

河口绕曲线流动：动力学和影响

基本信息

批准号：
1829979
负责人：
James Lerczak
金额：
$ 48.4万
依托单位：
Oregon State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-10-01 至 2023-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1829979&HistoricalAwards=false
关键词：
Flows Around Curves Estuaries Dynamics

项目摘要

Most estuaries have natural bends that flows must navigate around. Various studies have documented the circulation and stratification variability unique to flows of homogenous and stratified waters around bends in estuaries and rivers. However, none have attempted a systematic study in order to understand the dependence of the dynamics and impacts on a range of relevant estuarine parameters. This project will be a comprehensive study of the dynamics and regulation of flows (longitudinal and lateral) around channel bends in estuaries, the overall impact of these flows on salt transport, horizontal dispersion, and estuarine structure, and how this impact is dependent on estuarine regime. The project will engage a young audience through social media and science writing to convey the value of the physical ocean sciences. The training of a graduate research assistant and an undergraduate researcher in quantitative research is included. Several education and training opportunities for undergraduate and graduate students are planned. The project will additionally enhance collaborations and partnerships with scientists and stakeholders with interests in resource management and restoration of Yaquina Bay.Lateral (cross-channel) flows driven by a range of mechanisms (for example, differential advection, Coriolis forcing, asymmetric mixing, mixing over sloping bottoms) have been shown to interact strongly with the longitudinal estuarine currents, and have a fundamental impact on momentum budgets, dispersion of tracers and residence time in estuaries. This research would constitute the first systematic study of the dynamics of flows around curves in estuaries and will quantify the significance of these flows (relative to secondary flows driven by other mechanisms) and their impact on estuarine structure and function. The approach will include both idealized and realistic numerical simulations and analysis of previously collected data in estuaries that vary in channel size, curve structure and estuary regime classification.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.

大多数河口都有自然弯曲，水流必须绕行。各种研究记录了河口和河流弯道周围均匀和分层水流所特有的环流和分层变化。然而，没有人尝试进行系统研究，以了解动力学的依赖性以及对一系列相关河口参数的影响。该项目将全面研究河口河道弯曲周围的水流（纵向和横向）的动态和调节，这些水流对盐输送、水平扩散和河口结构的总体影响，以及这种影响如何依赖于河口政权。该项目将通过社交媒体和科学写作吸引年轻观众，以传达物理海洋科学的价值。包括对研究生研究助理和本科研究员进行定量研究的培训。计划为本科生和研究生提供一些教育和培训机会。该项目还将加强与对亚奎纳湾资源管理和恢复感兴趣的科学家和利益相关者的合作和伙伴关系。由一系列机制驱动的横向（跨海峡）流动（例如，差异平流、科里奥利强迫、不对称混合、混合）已被证明与纵向河口流强烈相互作用，并对动量预算、示踪剂分散和河口停留时间产生根本性影响。这项研究将构成对河口曲线周围流动动力学的首次系统研究，并将量化这些流动的重要性（相对于其他机制驱动的二次流动）及其对河口结构和功能的影响。该方法将包括理想化和现实的数值模拟以及对先前在河口尺寸、曲线结构和河口状况分类方面不同的河口收集的数据的分析。该奖项反映了 NSF 的法定使命，并通过使用基金会的知识进行评估，被认为值得支持。优点和更广泛的影响审查标准。