Interactions between Long Ocean Waves and Muddy Sea Floor

长海浪与泥泞海底之间的相互作用

• 批准号: 0751079
• 负责人: Philip Liu
• 金额: $ 29.89万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0751079&HistoricalAwards=false
• 关键词: Interactions; between; Long; Ocean; Waves

Intellectual Merit: On the continental shelf and in the coastal zone, wind waves interact with sea floor and a number of dynamic processes take place. If the sea floor is composed of sediments, a variety of dissipation mechanisms associated with the sediment rheology play important roles in enhancing wave damping and in modifying wave characteristics. Under this project the investigator will conduct an integrated theoretical and experimental program to accomplish several scientific goals. First, analytical solutions for mud flows under transient wave loadings will be developed to improve our fundamental understanding of various sea bottom dissipative mechanisms and their impacts on transient long wave propagation. Second, An archive of quality detailed experimental data sets that researchers may use to test their own analytic and numerical models will be generated. Third, model-data comparisons will be performed to understand the limitations of analytical solutions and direct numerical simulation (DNS) models for mud flows under wave loadings will be developed to further explore the physical processes. A Navier-Stokes solver with different stress-strain relationships, which depend on the rheology of the fluid mud, will be developed for various wave loadings. Fourth, depth-integrated, phase-resolving wave propagation models with sea bottom dissipative mechanisms included will be developed. A case study is planned to examine the wave attenuation in the Guyana coastal system that is characterized by very thick deposits of Amazon mud.Broader Impacts: The proposed research activities are at the interface between several field of science and engineering ¨C oceanography, fluid mechanics, and coastal engineering and will serve a bridge among them. The project will train one PhD student who will receive cutting edge training in experimental techniques, numerical methods and analytical solution techniques. Furthermore, the student will be trained in report writing and oral presentation and he/she will be encouraged to attend technical conferences and meetings. The DNS numerical models to be developed in the proposed project will be useful as research tools for many related engineering science field and can be employed after some modifications to investigate wave©\induced soil failures, debris flows and scouring around coastal structures. The Boussinesq-type wave models with the seafloor dissipative mechanisms considered, which are the main products of the project, will be useful tools for coastal engineers in various applications in the coastal regions where muddy seabeds are present. The new Boussinesq-type model can also be used to investigate the sediment transport and deposit during tsunamis. The laboratory data will be used to benchmark other numerical models under current and other development. To expedite the dissemination of what is learned during the project, we will develop and maintain a project web site, in addition to publishing manuscripts in the peer-reviewed literatures. Most of the investigator¡¯s research activities can be found on the following webpage: http://ceeserver.cee.cornell.edu/pll-group/index.htm Several upper-level undergraduate and graduate student courses at Cornell will be benefit significantly from the research project, as the laboratory measurement techniques developed in the project can be used in these courses. Currently the investigator is supervising 3 REU students supported by NSF and Engineering College fund. In the proposed project, he will carry on this tradition and encourage interested undergraduates to participate in research.

智力优点：在连续的架子和沿海地区，风波与海底相互作用，并进行了许多动态过程。如果海底由沉积物组成，则与沉积物流变学相关的多种耗散机制在增强波浪阻尼和修饰波特性方面起着重要作用。在这个项目下，研究者将进行一项综合的理论和实验计划，以实现几个科学目标。首先，将开发瞬时波载下泥流的分析解决方案，以提高我们对各种海底耗散机制的基本理解及其对瞬态长波传播的影响。其次，将生成研究人员可能用来测试自己的分析和数值模型的质量详细实验数据集的档案。第三，将进行模型数据比较，以了解波载下的泥流量的分析解决方案的局限性和直接的数值模拟（DNS）模型，以进一步探索物理过程。具有不同应力 - 应变关系的Navier-Stokes求解器，该求解器将用于各种波载量的流体泥浆的流变学。将开发出具有海底耗散机制的第四个，深度集成，分辨波传播模型。计划进行一项案例研究，以检查圭亚那沿海系统中的波浪衰减，其特征是亚马逊泥浆的沉积物非常厚。Broader的影响：拟议的研究活动处于科学和工程学领域之间的接口。该项目将培训一名博士生，他将接受实验技术，数值方法和分析解决方案技术的最先进培训。此外，该学生将接受报告写作和口头演讲的培训，他/她将被鼓励参加技术会议和会议。拟议项目中要开发的DNS数值模型将是许多相关工程科学领域的研究工具，并且可以在进行一些修改后使用以研究浪潮©\诱导的土壤故障，碎屑流和沿海结构周围的冲刷。考虑到该项目的主要产品，考虑到海底的海底式机制的Boussinesq型波模型将是存在泥泞海床的各种应用中的沿海工程师的有用工具。新的Boussinesq型模型也可用于调查海啸期间的沉积物运输和沉积。在当前和其他开发下，实验室数据将用于基准其他数值模型。为了加快项目中所学到的内容的传播，除了在同行评审的文献中发布手稿外，我们还将开发和维护一个项目网站。大多数研究人员的研究活动可以在以下网页上找到：http：//ceeserver.cee.cornell.edu/pll-group/index.htm康奈尔大学的几个上层本科和毕业生课程将从研究项目中受益匪浅，因为该研究项目将在实验室测量技术中受益匪浅。目前，调查员正在监督NSF和工程学院基金支持的3名REU学生。在拟议的项目中，他将继续这一传统，并鼓励有趣的本科生参加研究。