Collaborative Research: Circulation and Mixing in a Coastally Trapped River Plume.
合作研究:沿海被困河流羽流的循环和混合。
基本信息
- 批准号:1334231
- 负责人:
- 金额:$ 47.94万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2013
- 资助国家:美国
- 起止时间:2013-08-01 至 2017-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Under downwelling conditions, buoyant coastal currents can transport river-derived material hundreds of kilometers down the coast. The fate of this material is ultimately determined by the extent of mixing with the ambient coastal waters. Despite the importance that mixing plays in controlling the along-shelf dispersal of river-derived materials, few studies have directly measured mixing in the far-field of river plume. This study will quantify mixing and circulation in the Chesapeake Bay by combining a comprehensive field program with numerical models. The Chesapeake is ideal for this study because of its predictable coastal current and its proximity to extensive research infrastructure at the USACE facility in Duck, NC. The four primary objectives of the study are: to quantify mixing within the nose region, the interior, and the offshore edge of the plume during downwelling conditions, to obtain detailed measurements of plume propagation speeds and the structure of the circulation behind the nose in a buoyant coastal current under downwelling favorable winds, to identify the dominant mechanisms responsible for mixing and entrainment of salt into the coastal current, and to document the dominant dynamic balances that govern plume propagation during downwelling conditions under a range of wind forcing. This comprehensive field program will consist of moored, shipboard, and microstructure-AUV observations of circulation and mixing within the plume. High resolution simulations using ROMS will complement the field program by providing more comprehensive estimates of mixing, diagnose the dynamics of the plume, and assess the role of wind, waves and internal shear in driving plume mixing.Coastally-trapped river plumes represent a class of gravity currents that have been extensively studied using numerical models and laboratory experiments. Detailed field observations resulting from this study will provide new insights into mixing and circulation processes in a buoyant gravity current. This project will provide unprecedented measurement documenting the relative roles of mixing and advective straining in modifying the plume?s stratification. The relative importance of mixing in the nose region versus broadly distributed mixing behind the plume due to winds and waves will also be examined. Results will also elucidate the role of ageostrophic dynamics in the nose region and along the off-shore edge of the plume, once isopycnals become vertical. The field program will use adaptive sampling that combines both ship-based surveys and AUV-microstructure observations of a propagating coastal current. Utilizing the AUV to adaptively sample an ephemeral coastal feature is expected to lead to technological advances in observational oceanography. Lagrangian data will be complemented by a mooring array that will provide unprecedented near-surface resolution of stratification and shear in the far field of a river plume. Detailed near surface observations of turbulence will help to identify the dominant mixing mechanisms responsible for entraining ambient sea water into the plume.This project will serve as the basis for one graduate student's thesis at Rutgers. Several undergraduate students will also be included in the field effort through the NSF-funded Research Experience for Undergraduates at Rutgers and Woods Hole. The objectives for Broader Impacts are to translate the science themes and data sets from this study into innovative undergraduate teaching materials and to encourage STEM learning for future scientists (grades K-12) through hands-on activities related to the research. The expertise of the NSF-funded Centers for Ocean Science Education Excellence Networked Ocean World and the Ocean Observing Initiative's Education and Public Engagement (OOI EPE) Implementing Organization (IO) will be leveraged to create an online learning module for undergraduates. These lessons will be disseminated broadly through an OOI EPE online portal and workshops at ocean science meetings (e.g., AGU and ASLO Oceans). The modules will highlight the benefits of teaching with authentic data with the focus of engaging undergraduates in the scientific process.
在下降流条件下,活跃的海岸流可以将河流产生的物质沿海岸输送数百公里。 这种物质的命运最终取决于与周围沿海水域的混合程度。 尽管混合在控制河流来源物质沿陆架的扩散方面发挥着重要作用,但很少有研究直接测量远场河流羽流中的混合。 这项研究将通过综合现场计划与数值模型相结合来量化切萨皮克湾的混合和循环。 切萨皮克号是这项研究的理想选择,因为它具有可预测的海岸流,并且靠近北卡罗来纳州达克市 USACE 设施的广泛研究基础设施。 该研究的四个主要目标是:量化下降流条件下羽流的鼻部区域、内部和近海边缘内的混合,获得羽流传播速度和鼻部后面环流结构的详细测量结果。下降流有利风下的浮力沿海流,以确定负责混合和夹带盐进入沿海流的主要机制,并记录在一系列风力强迫下的下降流条件下控制羽流传播的主要动态平衡。 这个全面的现场计划将包括对羽流内循环和混合的系泊、船上和微观结构 AUV 观测。 使用 ROMS 的高分辨率模拟将通过提供更全面的混合估计、诊断羽流动力学以及评估风、波浪和内部剪切力在驱动羽流混合中的作用来补充现场程序。沿海捕获的河流羽流代表了一类重力流已通过数值模型和实验室实验进行了广泛研究。 这项研究产生的详细现场观察将为浮力重力流中的混合和循环过程提供新的见解。 该项目将提供前所未有的测量,记录混合和平流应变在改变羽流分层中的相对作用。 还将研究机头区域混合与风浪引起的羽流后面广泛分布的混合的相对重要性。 一旦等重线变得垂直,结果还将阐明鼻子区域和沿羽流离岸边缘的地转动力学的作用。 该现场计划将使用自适应采样,结合船基调查和传播海岸流的 AUV 微观结构观测。 利用 AUV 对短暂的海岸特征进行自适应采样预计将带来观测海洋学的技术进步。 拉格朗日数据将得到系泊阵列的补充,该阵列将提供河流羽流远场中前所未有的分层和剪切的近地表分辨率。对湍流的详细近地表观测将有助于确定将周围海水带入羽流的主要混合机制。该项目将作为罗格斯大学一名研究生论文的基础。 一些本科生也将通过国家科学基金会资助的罗格斯大学和伍兹霍尔大学本科生研究体验项目参与到这一领域的工作中。 Broader Impacts 的目标是将本研究的科学主题和数据集转化为创新的本科教材,并鼓励未来科学家(K-12 年级)通过与研究相关的实践活动进行 STEM 学习。 NSF 资助的海洋科学教育卓越中心网络海洋世界和海洋观测倡议的教育和公众参与 (OOI EPE) 实施组织 (IO) 的专业知识将被用来为本科生创建在线学习模块。 这些经验教训将通过 OOI EPE 在线门户和海洋科学会议(例如 AGU 和 ASLO Oceans)研讨会广泛传播。这些模块将强调使用真实数据进行教学的好处,重点是让本科生参与科学过程。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Robert Chant其他文献
Robert Chant的其他文献
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{{ truncateString('Robert Chant', 18)}}的其他基金
Collaborative Research: Oligohaline dispersion: transport processes at the estuary-tidal river transition
合作研究:寡盐分散:河口-潮汐河过渡过程中的传输过程
- 批准号:
2318998 - 财政年份:2023
- 资助金额:
$ 47.94万 - 项目类别:
Standard Grant
Collaborative Research: Tidally rectified flows in multiple inlet/lagoon systems: Consequences for transport and residence times
合作研究:多个入口/泻湖系统中的潮汐整流流:对运输和停留时间的影响
- 批准号:
2219897 - 财政年份:2022
- 资助金额:
$ 47.94万 - 项目类别:
Standard Grant
Collaborative Research: Lagrangian transport and patchiness of buoyant material in estuarine systems
合作研究:河口系统中浮力物质的拉格朗日输送和斑块性
- 批准号:
2148375 - 财政年份:2022
- 资助金额:
$ 47.94万 - 项目类别:
Standard Grant
Collaborative Research: River plume-cape interaction - Plume separation from the coastal wall, vorticity generation and fresh water retention
合作研究:河流羽流-海角相互作用——羽流与海岸壁的分离、涡度的产生和淡水保留
- 批准号:
1948777 - 财政年份:2020
- 资助金额:
$ 47.94万 - 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:
1325258 - 财政年份:2013
- 资助金额:
$ 47.94万 - 项目类别:
Standard Grant
Collaborative Research: Sediment Sources, Transport Mechanisms, and Fluxes in a Coastal Plain Estuary
合作研究:沿海平原河口的沉积物来源、输送机制和通量
- 批准号:
0928567 - 财政年份:2009
- 资助金额:
$ 47.94万 - 项目类别:
Standard Grant
Collaborative Proposal: Impact of secondary circulation and mixing of estuarine exchange flows.
合作提案:二次循环和河口交换流混合的影响。
- 批准号:
0825833 - 财政年份:2008
- 资助金额:
$ 47.94万 - 项目类别:
Standard Grant
Collaborative Research: Dissolved Organic Phosphorus: Quantifying Taxon-specific Rates of Hydrolysis and Uptake
合作研究:溶解有机磷:量化特定分类群的水解和吸收率
- 批准号:
0452904 - 财政年份:2005
- 资助金额:
$ 47.94万 - 项目类别:
Standard Grant
COLLABORATIVE RESEARCH: Lagrangian studies of the transport, transformation, and biological impact of nutrients and contaminant metals in an buoyant plume
合作研究:对浮力羽流中营养物和污染物金属的传输、转化和生物影响的拉格朗日研究
- 批准号:
0238957 - 财政年份:2003
- 资助金额:
$ 47.94万 - 项目类别:
Continuing Grant
Collaborative Research: Lagrangian Studies of Mixing and Secondary Circulation in a Stratified Channel
合作研究:分层通道中混合和二次循环的拉格朗日研究
- 批准号:
0095913 - 财政年份:2001
- 资助金额:
$ 47.94万 - 项目类别:
Continuing Grant
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