CROSSTEX - Swash Zone Hydrodynamics and Sediment Transport

0452862本提案是跨界沉积物输送实验(Crosstex)的一部分，该实验是一个多调查者项目，其重点是沿海地区的跨界沉积物输送过程。Crosstex由三个分组项目组成，涉及不同的沿海泥沙输送过程，包括冲浪区的片状水流输送、内外海浪区的暂停输送和短期地貌变化。这些项目因要研究的问题的性质以及在俄勒冈州立大学(俄勒冈州立大学)进行的大型波浪水槽综合共享实验而相互关联。该项目专门寻求更好地了解冲激区内的小尺度泥沙输送过程。将在片状流中测量浓度、流体和泥沙颗粒速度的瞬时场，这些测量和直接计算的湍流统计量，包括颗粒应力，将用于检验现有的两相泥沙输送模型，并指导其进一步发展。为实现这一目标，提出了一套集实验、理论和计算于一体的研究方案。刘菲利普博士将带领一个研究团队开发基于两相雷诺平均纳维-斯托克斯(RANS)方程的模拟模型。与Crosstex的其他研究小组合作，将在俄亥俄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。一种新的光纤测量系统(FMS)将被设计成带有远程控制的定位装置。通过采用粒子成像测速(PIV)等定量成像技术，可以同时获得高分辨率的流体和沉积物颗粒速度测量。埃德温·考恩博士将负责FMS的设计和性能。更广泛的影响：这项研究处于科学和工程的几个领域--流体力学、海洋学、地质学、土力学和应用数学--的交界处，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尖端培训。将开发的数值模型将作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体破坏、海岸建筑物周围的冲刷、泥石流和沙丘迁移。实验室数据将被用来对当前或未来发展中的其他数值模型进行基准测试。除了出版同行评议文献的手稿外，还将开发一个项目网站，以广泛传播这些成果。这项研究计划将对我们的学术计划产生重大影响。康奈尔大学的几门高级本科生和研究生课程将从研究计划中受益匪浅，因为该项目开发的仪器将用于这些课程，实验和数值结果将包括在课程材料中。我们还将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REU网站。在康奈尔，PIS和REU参与者将与科学中心的工作人员合作，展示河流和海岸的泥沙淤积和冲刷机制。在俄勒冈州立大学，PI也与当地的水族馆和科学博物馆保持着良好的工作关系，并将向他们分发蒸馏版本的Crosstex。最后，导致泥沙在沼泽中运移的过程和本研究中制定的方法与海啸造成的泥沙运移有关。

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.