CROSSTEX - Swash Zone Hydrodynamics and Sediment Transport

CROSSTEX - 斜流区流体动力学和沉积物输送

• 批准号: 0452862
• 负责人: Philip Liu
• 金额: $ 73.4万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-03-15 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0452862&HistoricalAwards=false
• 关键词: CROSSTEX; Swash; Zone; Hydrodynamics; Sediment

0452862This proposal is a part of the Cross Shore Sediment Transport Experiments (CROSSTEX), designed as a multi-investigator project that is focused on cross-shore sediment transport processes in the coastal zone. CROSSTEX consists of three sub-group projects that address different coastal sediment transport processes, including sheet flow transport in the swash zone, suspended transport in the inner and outer surf zone and short-term morphological changes. These projects are interconnected by the nature of the problems to be studied and by the conducting of an integrated and shared experiment in the large wave flume at the Oregon State University (OSU). This project specifically seeks a better understanding of small-scale sediment transport processes in the swash zone. The instantaneous fields of concentration and fluid and sediment particle velocity will be measured in the sheet flow layer and these measurements and the directly calculated turbulent statistics, including the particle stress, will be used to test existing two-phase sediment transport models and to guide their further development. To achieve the objectives, an integrated experimental, theoretical and computational research program is proposed. Dr. Philip Liu will lead a research team to develop simulation models based on the two-phase Reynolds Averaged Navier-Stokes (RANS) equations. In collaboration with other research groups in the CROSSTEX, a series of near prototype scale experiments will be conducted in the large wave flume at the OSU. A new Fiberscope Measurement System (FMS) will be designed with a remotely controlled positioning device. By adopting quantitative imaging techniques, such as particle imaging velocimetry (PIV), simultaneous high-resolution measurements of both fluid and sediment particle velocities can be obtained. Dr. Edwin Cowen will be responsible for the design and performance of the FMS. Broader Impacts: The research is at the interface between several fields of science and engineering- fluid dynamics, oceanography, geology, soil mechanics, and applied mathematics- and will serve as a bridge among them. All graduate students involved in the project will receive cutting-edge training in mathematical modeling, numerical methods, and experimental techniques. The numerical models to be developed will be useful as research tools for many related engineering science fields and can be employed to investigate wave-induced soil failures, scouring around coastal structures, debris flows, and sand dune migration. The laboratory data will be used to benchmark other numerical models under current or future development. A project web site will be developed to disseminate the results broadly in addition to publishing manuscripts in the peer-reviewed literature. The research program will have significant impacts on our academic programs. Several upper-level undergraduate and graduate student courses at Cornell will benefit significantly from the research program, as the instruments developed in this project will be used in these courses and the experimental and numerical results will be included in the course material. We will also make every effort to directly expose undergraduate students to the research. Oregon State University is currently an REU site. At Cornell, the PIs and REU participants will work with staff members of the Sciencenter on exhibits on both the mechanics of sediment deposition and scour in rivers and along coasts. At Oregon State University, the PIs also have good working relationships with the local aquarium and science museum and will distribute distilled versions of CROSSTEX to them. Finally, the processes leading to sediment transport in the swash and the methodology developed in this study are relevant to sediment transport caused by tsunamis.

0452862该提案是跨海岸沉积物输运实验（CROSSTEX）的一部分，该实验是一个多研究者项目，重点研究沿海区跨海岸沉积物输运过程。 CROSSTEX由三个小组项目组成，解决不同的沿海沉积物输运过程，包括冲流区的片流输运，内外碎波区的悬浮输运和短期形态变化。这些项目是相互关联的性质的问题进行研究，并在大型波浪水槽在俄勒冈州州立大学（OSU）进行综合和共享的实验。 这个项目 特别是寻求更好地了解小规模的泥沙输运过程中的冲刷区。 瞬时场的浓度和流体和泥沙颗粒速度将被测量在片流层和这些测量和直接计算的湍流统计，包括颗粒应力，将被用来测试现有的两相泥沙输运模型，并指导其进一步发展。 为了实现这一目标，提出了一个综合的实验，理论和计算研究计划。Philip Liu博士将领导一个研究团队开发基于两相雷诺平均Navier-Stokes（RANS）方程的模拟模型。与CROSSTEX的其他研究小组合作，将在俄勒冈州立大学的大型波浪水槽中进行一系列接近原型规模的实验。一种新型的光纤内窥镜测量系统（FMS）将被设计为具有远程控制定位装置。通过采用定量成像技术，如粒子成像测速（PIV），可以同时获得流体和沉积物颗粒速度的高分辨率测量。Edwin Cowen博士将负责FMS的设计和性能。 更广泛的影响： 这项研究是在科学和工程的几个领域之间的接口-流体动力学，海洋学，地质学，土壤力学和应用数学-并将作为它们之间的桥梁。参与该项目的所有研究生将接受数学建模，数值方法和实验技术的尖端培训。 开发的数值模型将是有用的许多相关的工程科学领域的研究工具，并可以用来调查波浪引起的土壤破坏，海岸结构，泥石流和沙丘迁移周围的冲刷。 实验室数据将用于基准的其他数值模式在当前或未来的发展。 将建立一个项目网站，除了在同行审查的文献中发表手稿外，还将广泛传播成果。该研究计划将对我们的学术课程产生重大影响。 康奈尔大学的几门高水平本科生和研究生课程将从研究计划中受益匪浅，因为该项目中开发的仪器将用于这些课程，实验和数值结果将包含在课程材料中。我们还将尽一切努力让本科生直接接触研究。 俄勒冈州州立大学目前是一个REU网站。在康奈尔大学，PI和REU的参与者将与科学中心的工作人员合作，展出河流和沿着的沉积物沉积和冲刷机制。在俄勒冈州州立大学，PI也与当地水族馆和科学博物馆有着良好的工作关系，并将向他们分发CROSSTEX的蒸馏版本。最后，导致泥沙输运的过程中的冲击和本研究中开发的方法是相关的海啸引起的泥沙输运。