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

职业：沿海底栖边界层沉积物水界面的标量传输：推进波多黎各的近岸过程研究和教育

• 批准号: 1753158
• 负责人: Sylvia Rodriguez-Abudo
• 金额: $ 51.33万
• 依托单位: University of Puerto Rico Mayaguez
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1753158&HistoricalAwards=false
• 关键词: CAREER; Scalar; Transport; Sediment; Water

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.

该项目提供了一种综合方法，以推进波多黎各岛的近岸进程研究和教育。它的重点是提高我们对水和其他成分在波浪作用下在海床和上覆水之间的交换过程的理解。将使用非侵入性激光技术对平坦、波纹和过渡波纹床制度进行系统的实验进展，以获得具有前所未有分辨率的浓度和速度场的详细观测结果。与数值建模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学。这项研究将提供参数，说明沿海海底边界层的生态、生物地球化学和微生物过程，并将提高妇女和少数民族在海洋科学和工程领域的地位。该研究计划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，并利用前所未有的流动可视化和量化技术增强现有课程;海滩演变和污染的互动模块的开发;以及研究生奖学金研讨会系列的开始，在奖学金申请过程中指导学生。该项目将提供必要的资源，以促进波多黎各下一代海洋科学家和工程师，并为妇女和少数民族提供宝贵的榜样，该项目审查了复杂的粗糙度尺度和空间变化的质量源的综合影响，在振荡波运动下的沉积物-水界面的标量传输。它建立在以前的研究结果表明，整个涟漪波长的动量通量的高变异性，并探讨了溶质的整体质量交换的优先组织的效果。通过详细的实验室实验（使用PIV和PLIF），强大的物理为基础的技术，数据减少，和一个新的数值模拟合作相结合，该项目将提供复杂的波纹内混合结构的基础知识，从非定常水动力强迫，底形诱导的相干运动，和非均匀质量源的组合。基于PI在移动的波纹床湍流振荡流方面的专业知识，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质量输运的方式，包括污染物，营养物质和生物地球化学过程。建议的研究计划将通过开发新的和增强的课程，外展活动和奖学金写作研讨会，整合到一个强大的教育计划中。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。