CROSSTEX - Swash Zone Hydrodynamics and Sediment Transport

[0452862]该提案是跨岸沉积物运输实验（CROSSTEX）的一部分，该实验是一个多研究者项目，重点研究海岸带的跨岸沉积物运输过程。CROSSTEX由三个亚组项目组成，研究不同的海岸沉积物输运过程，包括冲积带的片流输运、内外冲浪带的悬浮输运以及短期形态变化。这些项目通过所要研究的问题的性质以及在俄勒冈州立大学（OSU）的大波水槽中进行的综合和共享实验而相互联系。该项目旨在更好地了解冲积带的小规模泥沙输送过程。在片流层中测量瞬时浓度场以及流体和泥沙颗粒速度场，这些测量结果与直接计算的湍流统计数据（包括颗粒应力）将用于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，提出了一套实验、理论和计算相结合的研究方案。Philip Liu博士将带领一个研究小组开发基于两相Reynolds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波水槽中进行一系列接近原型规模的实验。一种新型Fiberscope测量系统（FMS）将设计一个远程控制定位装置。通过采用定量成像技术，如颗粒成像测速（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-并将成为它们之间的桥梁。所有参与该项目的研究生将接受数学建模、数值方法和实验技术方面的前沿培训。所开发的数值模型将成为许多相关工程科学领域的研究工具，并可用于研究波浪引起的土壤破坏、海岸结构周围的冲刷、泥石流和沙丘迁移。实验室数据将用于当前或未来发展的其他数值模型的基准。除了在同行评议的文献中发表手稿外，还将开发一个项目网站广泛传播研究结果。该研究项目将对我们的学术项目产生重大影响。康奈尔大学的一些高级本科生和研究生课程将从该研究项目中受益匪浅，因为该项目开发的仪器将在这些课程中使用，并且实验和数值结果将包含在课程材料中。我们也会尽一切努力让本科生直接接触到研究。俄勒冈州立大学目前是一个REU网站。在康奈尔大学，PIs和REU的参与者将与科学中心的工作人员合作，展示河流和沿海沉积物沉积和冲刷的力学。在俄勒冈州立大学，pi也与当地的水族馆和科学博物馆有着良好的合作关系，并将向他们分发蒸馏版的CROSSTEX。最后，导致冲积区输沙的过程和本研究中开发的方法与海啸引起的输沙有关。

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.