CAREER: Advancing Nearshore Circulation Modeling

职业：推进近岸环流建模

• 批准号: 0239642
• 负责人: Donald Slinn
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-02-15 至 2009-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0239642&HistoricalAwards=false
• 关键词: CAREER; Advancing; Nearshore; Circulation; Modeling

ABSTRACTPI/Institution: Slinn/UF-G Proposal No: OCE-0239642 This integrated plan for research and education in Coastal Engineering will emphasize nearshore circulation modeling. Two new (three-dimensional (3-D), time-dependent, non-hydrostatic, large-eddy simulation (LES) surf zone models will be used to gain improved understanding of effects of three important nearshore processes: 1) Mean undertow; 2) Along-shore current instabilities; and 3) Partitioning of offshore mass transport between rip currents and undertow. Calibration of the models will be achieved by comparison with laboratory measurements collected at the Army Corps of Engineers, Long-Shore Sediment Transport Facility (LSTF) and with data from recent and ongoing field experiments at Duck, North Carolina, Daytona Beach, Florida, and from planned experiments such as NCEX. Six specific hypotheses will be tested with the models, lab, and field data. The first new model is a phase-averaged model and examines the depth-dependent, low-frequency, nearshore current response to breaking waves in the surf zone. This model is faster computationally than other similar codes and can be used to study shear instabilities of the mean current and time-averaged effects of the undertow in unsteady flows. The second new model is based on the Volume of Fluid (VOF) algorithm and simulates the individual wave breaking events in the surf zone within the LES approximations. This model can be used to examine individual wave-breaking effects but it is slower computationally, because of the more complex methodology for solving the Poisson equation and because smaller time steps are required to capture higher frequency fluctuations associated with turbulent flow caused by breaking waves. It is anticipated these new models will help the field converge towards improved predictive capabilities for near shore flow. Five specific educational integration activities are described. These include: 1) guiding graduate students on their thesis projects; 2) supervising senior projects for Civil Engineering students, 3) developing a new under-graduate course introducing Coastal Engineering to Civil Engineering majors; 4) collaborating with students from outside of engineering on nearshore science and public information projects, and 5) enhancing my own continuing education by taking (and then teaching) advanced courses in Coastal Engineering.

摘要PI/机构： Slinn/UF-G 提案编号：OCE-0239642海岸工程研究和教育的综合计划将强调近岸环流建模。两个新的（三维（3-D），随时间变化，非流体静力学，大涡模拟（LES）冲浪区模型将被用来获得三个重要的近岸过程的影响，以提高理解：1）平均回流; 2）沿岸流不稳定性;和3）离岸质量传输的分裂之间的离岸流和回流。通过与陆军工程兵部队长海岸沉积物运输设施（LSTF）收集的实验室测量值进行比较，并与最近和正在进行的北卡罗来纳州达克、佛罗里达代托纳海滩的实地实验数据以及计划中的实验（如NCEX）数据进行比较，将实现模型的校准。六个具体的假设将与模型，实验室和现场数据进行测试。第一个新的模型是一个相位平均模型，并检查深度相关的，低频，近岸流破碎波在碎波区的反应。该模型计算速度快，可用于研究非定常流中平均流的剪切不稳定性和底流的时均效应。第二个新的模型是基于体积的流体（VOF）算法，并模拟在LES近似的碎波区的个别波浪破碎事件。该模型可用于检查单个波浪破碎效应，但计算速度较慢，因为求解泊松方程的方法更复杂，并且需要较小的时间步长来捕获与破碎波浪引起的湍流相关的较高频率波动。预计这些新模型将有助于该领域朝着改进的近海岸流预测能力的方向发展。描述了五项具体的教育融合活动。其中包括：1）指导研究生的论文设计，2）指导土木工程专业的毕业设计，3）开发新的本科课程，将海岸工程引入土木工程专业; 4）与工程以外的学生合作进行近岸科学和公共信息项目，5）通过参加（然后教授）海岸工程高级课程来加强我自己的继续教育。