Wave-Driven Flows over Coral Reefs and their Effects on Lagoon-Ocean Exchange
珊瑚礁上的波浪驱动流及其对泻湖-海洋交换的影响
基本信息
- 批准号:0622967
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2006
- 资助国家:美国
- 起止时间:2006-09-15 至 2010-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
ABSTRACTOCE-0622967Intellectual meritA combined observational and modeling study will be conducted to address barotropic dynamics of wave-driven flows over coral reefs and the concomitant ocean-reef exchange. The work is designed to test how well radiation stress theory explains flows over and through the complex topography of typical reef/lagoon complexes, as well as examine how outflow jets from reef lagoons interact with the wave-driven inflow over a reef and thus determines net exchange. The field observations will be conducted at a micro-tidal lagoon system on Moorea, over a range of wave conditions. In each experiment, an array of Acoustic Doppler Current Profilers (ADCPs) and wave/tide gauges will be deployed along a cross-reef transect to resolve the key terms in the cross-reef momentum balance, and obtain the best estimates to date of bottom stress over coral reefs. A second array will be deployed to measure mass fluxes through the lagoon and out the reef pass, to complete a water and exchange budget for the system. Finally, intensive shipboard profiles of the water column and drifter releases will be used to determine the fate of the pass jet and potential for re-entrainment to the reef, particularly in the presence of persistent alongshore flow. In parallel with the field program, a series of numerical experiments on idealized reef-lagoon-pass systems will be conducted, mapping the parameter space of dynamical balances. The numerical work will use the open source circulation model developed at Stanford University (3D, baroclinic, non-hydrostatic, unstructured grid, finite volume, parallel code) coupled to a wind-wave model. The proposed simulations looks at a class of nearshore flows that has received less attention than has similar flows on beaches and should reveal the extent to which the present model of the interaction of waves and mean flows works for a geometry that is different than that of a beach. The "confrontation" of model and observation may point the way to using new classes of wave models, or even highlight fundamental differences between theory and observation that have no present explanation. From the standpoint of shallow water dynamics, the role of waves in modifying the outflow from a small inlet is also novel. Broader ImpactsThe functioning of coral reefs, some of the most threatened and economically valuable marine ecosystems, are strongly dependent on hydrodynamics. The experiments and computations will significantly improve our understanding of coral reef hydrodynamics, and thus speed progress toward predictive models that could be used to set environmental policies, or in designing marine reserves based on knowledge of "connectivity". From an interdisciplinary standpoint, this research will provide biologists and geochemists working on reefs with means of understanding how remote forcing (swell) changes conditions for organisms of interest or for chemical reactions and transformations. The research team has a record of engaging and collaborating with other disciplines. The physical understanding of the system will greatly aid numerous LTER activities (e.g. zooplankton, fish ecology, nutrient dynamics, etc.) at the field site. The numerical circulation model will provide the essential foundation any future 3D physical biological modeling of this and similar systems. Investment in the Stanford model development will benefit the oceanographic community via our long-standing practice of sharing model source code with other users. In terms of education, this project will involve the training of 2 women PhD students (both NSF fellows), noting that females are underrepresented in physical oceanography. They will both learn about observational physical oceanography, scientific diving and high performance computing. The field work will also involve several other graduate and undergraduate students who will be exposed to and participate in interdisciplinary experiments, as well gaining experience with studies of complex coastal flows.
将进行一项观测和模拟相结合的研究,以解决珊瑚礁上方波浪驱动流的正压动力学以及伴随的海洋-珊瑚礁交换。这项工作的目的是测试如何以及辐射应力理论解释流量,并通过典型的珊瑚礁/泻湖复合体的复杂地形,以及研究如何从珊瑚礁泻湖流出射流相互作用与波浪驱动的流入珊瑚礁,从而确定净交换。现场观测将在一系列波浪条件下在Moorea的微潮泻湖系统进行。在每个实验中,将沿沿着一个跨礁断面部署一组声学多普勒海流剖面仪和波浪/潮汐测量仪,以解决跨礁动量平衡中的关键项,并获得迄今为止对珊瑚礁海底应力的最佳估计。将部署第二个阵列来测量通过泻湖和珊瑚礁通道的质量通量,以完成系统的水和交换预算。最后,密集的船舶配置文件的水柱和漂流物的释放将被用来确定的命运的通行证射流和潜在的重新夹带到珊瑚礁,特别是在存在持续的沿岸流。与实地计划并行的是,将对理想化的礁石-泻湖-通道系统进行一系列数值试验,绘制动态平衡的参数空间。数值工作将使用斯坦福大学开发的开放源环流模式(三维、斜压、非流体静力、非结构网格、有限体积、并行代码),并与风浪模式相结合。拟议的模拟着眼于一类近岸流,已收到较少的关注比有类似的流在海滩上,并应揭示在何种程度上,目前的模型的相互作用的波浪和平均流量的工程几何形状是不同于一个海滩。模型和观测的“对抗”可能会为使用新的波动模型指明方向,甚至会突出理论和观测之间目前还没有解释的根本差异。从浅水动力学的观点来看,波浪在改变小入口流出量方面的作用也是新颖的。珊瑚礁是一些最受威胁和具有经济价值的海洋生态系统,其功能在很大程度上取决于水动力学。实验和计算将大大提高我们对珊瑚礁流体动力学的理解,从而加快可用于制定环境政策的预测模型的进展,或基于“连通性”知识设计海洋保护区。从跨学科的角度来看,这项研究将为从事珊瑚礁研究的生物学家和地球化学家提供了解远程强迫(膨胀)如何改变感兴趣的生物或化学反应和转化条件的手段。研究团队有参与和与其他学科合作的记录。对该系统的物理理解将大大有助于许多LTER活动(例如浮游动物、鱼类生态学、营养动态等)。在现场。数值循环模型将为该系统和类似系统的任何未来3D物理生物建模提供必要的基础。对斯坦福大学模型开发的投资将通过我们与其他用户共享模型源代码的长期做法使海洋学界受益。在教育方面,该项目将培训2名女博士生(均为国家科学基金会研究员),并指出,物理海洋学专业的女性人数不足。他们都将学习观测物理海洋学,科学潜水和高性能计算。实地工作还将涉及其他几个研究生和本科生谁将接触到并参与跨学科实验,以及获得复杂的沿海流动的研究经验。
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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Stephen Monismith其他文献
Stephen Monismith的其他文献
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{{ truncateString('Stephen Monismith', 18)}}的其他基金
Collaborative Research: Kelp forest hydrodynamics: observations of drag and cross-shore exchange on the inner shelf
合作研究:海带森林流体动力学:内陆架阻力和跨岸交换的观测
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2022927 - 财政年份:2020
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Wavy turbulent flow over a coral reef: vertical structure and fluxes
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1948189 - 财政年份:2020
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-- - 项目类别:
Standard Grant
Collaborative Research: Wave driven flow through a shallow, fringing reef
合作研究:波浪驱动流过浅层岸礁
- 批准号:
1536502 - 财政年份:2015
- 资助金额:
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- 批准号:
1235552 - 财政年份:2012
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-- - 项目类别:
Standard Grant
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合作研究:内架横向混合与分散
- 批准号:
0926340 - 财政年份:2009
- 资助金额:
-- - 项目类别:
Standard Grant
Collaborative Research: Turbulent fluxes and boundary layer structure due to near-shore internal tides
合作研究:近岸内潮汐引起的湍流通量和边界层结构
- 批准号:
0824972 - 财政年份:2009
- 资助金额:
-- - 项目类别:
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- 批准号:
0425312 - 财政年份:2004
- 资助金额:
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Collaborative Research Proposal: Development of a Combined In Situ Particle Imaging Velocimeter / Fluorescence Imaging System
合作研究提案:开发组合式原位粒子成像测速仪/荧光成像系统
- 批准号:
0220213 - 财政年份:2002
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-- - 项目类别:
Continuing Grant
Collaborative Research: Mass Transfer Due to Oscillatory Flow Over Coral Reefs
合作研究:珊瑚礁上振荡流引起的质量传递
- 批准号:
0117859 - 财政年份:2001
- 资助金额:
-- - 项目类别:
Standard Grant
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