CAREER: Scalar Transport at the Sediment Water Interface in Coastal Benthic Boundary Layers: Advancing Nearshore Processes Research and Education in Puerto Rico

该项目提供了一种综合方法来推进波多黎各岛近岸过程的研究和教育。它的重点是促进我们对波浪作用下海底和上覆水之间的水和其他成分交换过程的理解。将采用非侵入式激光技术对平坦、波纹和过渡波纹床进行系统的实验，以前所未有的分辨率获得浓度和速度场的详细观测。与数值模拟小组的新合作将为实验提供信息，为交叉验证提供有价值的数据，并将研究扩展到更复杂的物理中。这项研究将提供描述沿海底栖边界层的生态、生物地球化学和微生物过程的参数化，并将促进妇女和少数民族在海洋科学和工程领域的发展。该研究项目通过各种努力整合到一个强大的教育计划中，包括创建一个新的课程，并用前所未有的流动可视化和量化技术增强现有课程；海滩演变与污染互动模块的开发；并开始了研究生奖学金研讨会系列，以指导学生在奖学金申请过程中。该项目将为促进波多黎各下一代海洋科学家和工程师提供必要的资源，并为妇女和少数民族提供宝贵的榜样。该项目研究了振荡波运动下复杂粗糙度尺度和空间变化质量源对沉积物-水界面标量输运的综合影响。它建立在先前的发现之上，证明了动量通量在波纹波长上的高度可变性，并探索了溶质的优先组织对总体质量交换的影响。通过详细的实验室实验（使用PIV和PLIF），强大的基于物理的数据简化技术，以及新的数值模拟合作，该项目将提供关于非定常流体动力强迫，形状诱导的相干运动和非均匀质量源组合导致的复杂波纹内混合结构的基础知识。基于PI在流动波纹床上湍流振荡流动方面的专业知识，这项研究有可能深刻影响当前确定性模型参数化沿海底栖边界层中物质运输的方式，包括污染物、营养物质和生物地球化学过程。拟议的研究计划将通过开发新的和改进的课程、外展活动和奖学金写作讲习班，纳入一项强有力的教育计划。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This project provides an integrated approach to advance nearshore processes research and education on the island of Puerto Rico. It focuses on advancing our understanding of exchange processes of water and other constituents between the seabed and the overlying water under the action of waves. A systematic progression of experiments on flat, rippled and transitioning rippled bed regimes will be carried out using non-invasive laser-based techniques to obtain detailed observations of concentration and velocity fields with unprecedented resolution. A new collaboration with a numerical modeling group will inform the experiments, provide valuable data for cross-validation, and extend the research into more complex physics. The research will provide parameterizations describing ecological, biogeochemical and microbiological processes in the coastal benthic boundary layer and it will advance women and minorities in the fields of ocean sciences and engineering. The research program is integrated into a robust education plan through a variety of efforts, including the creation of a new course and enhancement of existing courses with unprecedented flow visualization and quantification techniques; the development of interactive modules on beach evolution and contamination; and the inception of a Graduate Fellowship Workshop series to coach students during the fellowship application process. This project will provide essential resources to advance the next generation of ocean scientists and engineers in Puerto Rico, and provide valuable role models for women and minorities.This project examines the combined effect of complex roughness scales and spatially varying mass sources on scalar transport across the sediment-water interface under oscillating wave motion. It builds upon previous findings that demonstrate a high variability of momentum fluxes across the ripple wavelengths, and explores the effect of preferential organization of solutes on the overall mass exchange. Through a combination of detailed laboratory experiments (using PIV and PLIF), robust physics-based techniques for data reduction, and a new numerical modeling collaboration, this project will provide fundamental knowledge on the complex intra-ripple mixing structure resulting from a combination of unsteady hydrodynamic forcing, bedform-induced coherent motions, and nonuniform mass sources. Grounded on the PI's expertise in turbulent oscillatory flow over mobile rippled beds, this study has the potential to profoundly impact the way current deterministic models parameterize mass transport in coastal benthic boundary layers including contaminants, nutrients, and biogeochemical processes. The proposed research program will be integrated into a strong educational plan through the development of new and enhanced courses, outreach activities, and fellowship writing workshops.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.