Collaborative Research: CROSSTEX - Wave Breaking and Boundary Layer Processes and the Resulting Sediment Suspension in the Surf zone

智力优势：跨海岸沉积物输运实验项目的开发是为了填补复杂的现场条件和小规模实验室实验之间的差距。本项目将侧重于近岸水动力学和碎波带沉积物输运的物理机制，特别是波浪破碎湍流和底边界层湍流对近岸沉积物悬浮过程的相对重要性。俄勒冈州州立大学的大型波浪水槽是该项目的重点，该项目结合了传统上在实验室实验、野外工作和数值模拟三个领域工作的研究人员的独特才能，并提供了一个机会，以推进近岸沉积物输运模拟的科学发展。预期的成果之一是在空间和时间尺度上更好地了解与基于过程的模型有关的问题，以及一套用于验证数值模型的基准数据集。测量水柱和边界层湍流应力的仪器的最新进展，基于网络的数据存档和检索数据共享和协作的进展，以及数字代码和计算机资源的最新实施将结合起来。例如，仪器和实验技术将被组合成三个子阵列，用于观测三相流（瞬时速度、沉积物悬浮和空隙率），每个子阵列重叠并集中于水柱的特定部分：低于槽水位的表面层和包括底部粗糙度的底部边界层。数值模拟将分为三个子区域，以解决空间/时间尺度和复杂性变化的问题（例如，单相或两相流;更广泛的影响：波浪研究实验室（WRL）是NSF REU（本科生研究经验）的近岸科学和减灾网站（http：//wave.oregonstate.edu/）。考克斯博士是该研究中心的首席PI，另外两个CROSSTEX提案的3名共同PI担任教员导师。每年夏天，这些导师和他们的研究生与10名有才华的本科生一起从事积极的研究项目，其总体目标是鼓励这些学生考虑读研究生。REU的学生有一半来自代表性不足的群体，一半来自俄勒冈州立大学以外。对于该项目的第1年和第2年，至少有5名REU学生将参与CROSSTEX项目。WRL积极参与K-12教育计划和外展活动，作为其指定为NSF-NEES网站的一部分。WRL目前正在与教育和推广人员和计划合作，制定一个全面的K-12教育和推广计划，该计划将用于突出CROSSTEX项目。在这个为期四年的项目中，几个来自俄勒冈州立大学、俄亥俄州和美国大学的研究生。佛罗里达将接受复杂的实验和数值技术的培训。

Intellectual Merit: The CROs-Shore Sediment Transport EXperiment (CROSSTEX) project has been developed to fill in the gap between complex field conditions and small-scale laboratory experiments. This project will focus on the physical mechanisms of nearshore hydrodynamics and sediment transport in the surf zone and in particular the relative importance of wave breaking turbulence and bottom boundary layer turbulence on nearshore sediment suspension processes. The Large Wave Flume at Oregon State University serves as the focal point for this project, and the project combines the unique talents of researchers who have traditionally worked in the three areas of laboratory experiments, field work, and numerical modeling and provides an opportunity to advance the state of the science in nearshore modeling of sediment transport. One of the expected outcome is a better understanding at space- and time-scales relevant to process-based models and a set of benchmark data sets for validation of numerical models. The latest advances in instrumentation to measure turbulent stresses in the water column and boundary layer, advances in web-based data archival and retrieval for data sharing and collaboration, and the latest implementation of numerical codes and computer resources will be combined. For example, instrumentation and experimental techniques will be combined into three sub-arrays for observing three phase flow (instantaneous velocity, sediment suspension, and void fraction) with each overlapping and focusing on a particular part of the water column: the surface layer, below trough level, and the bottom boundary layer including bottom roughness. The numerical modeling will be divided into three sub-areas to resolve issues of space/time scales and varying in complexity (e.g., one- or two-phase flow; complexity of turbulence closure schemes).Broader Impacts: The Wave Research Laboratory (WRL) is an NSF REU (Research Experience for Undergraduates) site for nearshore science and hazard mitigation (http://wave.oregonstate.edu/). Dr. Cox is the lead PI for the site and 3 co-PIs on the two other CROSSTEX proposals serve as faculty mentors. Each summer, these mentors and their graduate students work with 10 talented undergraduate on active research projects with an overall goal of encouraging these students to consider graduate school. Half of the REU students are from under-represented groups, and half come from outside of OSU. For Years 1 and 2 of this project, at least 5 of the REU students will be involved in the CROSSTEX project. The WRL is actively engaged in K-12 educational programs and outreach as part of its designation as an NSF-NEES site. The WRL is currently working with education and outreach people and programs to develop a comprehensive K-12 education and outreach program which will be used to highlight the CROSSTEX project. During this four-year project, several graduate students at OSU, Ohio State, and U. Florida will receive training in sophisticated experimental and numerical techniques.