Boundary layer dynamics and sediment transport in swash interactions

冲刷相互作用中的边界层动力学和沉积物输送

基本信息

批准号：
2048676
负责人：
Nimish Pujara
金额：
$ 30万
依托单位：
University of Wisconsin-Madison
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-03-15 至 2025-02-28
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2048676&HistoricalAwards=false
关键词：
Boundary layer dynamics sediment transport

项目摘要

This project will explore the water motions that result from the wave that runs down a beach slope as it encounters the next wave coming up. This interaction will be investigated in the zone of the beach that is wetted and dried by waves after they break, technically known as the swash zone. Water motion interactions produced by oppositely moving waves will be studied with laboratory experiments in a wave flume. Experiments will measure, in detail, flows near the sandy bottom, where sand becomes suspended in the water column. These processes determine whether a beach erodes or becomes wider; whether it steepens or flattens. The study will provide information for future efforts to emulate beaches with mathematical models. The project will support one PhD student and 6 undergraduate research interns. The interns will be recruited from underrepresented groups through a program in the college of engineering at UW-Madison. Undergraduate interns will design demonstrations on ocean waves for “Science Saturdays,” which are activities geared toward K-12 students. This project will study wave-driven flow interactions at the swash zone of the beach. Interactions will be studied with laboratory experiments (in a wave flume) that include successive solitary waves. Experiments will be designed to measure boundary layer dynamics and sediment resuspension. Flow interactions determine the accretion vs erosion balance at the beach and shape the morphology of the beach. The study will propose parametrizations of sediment transport at the swash zone and provide information for future validations of numerical models. The project will support one PhD student and 6 REUs that will be recruited from underrepresented groups through a program in the college of engineering at UW. Undergrads will design demonstrations for “Science Saturdays,” geared toward K-12 students.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.

该项目将探索由于海滩斜坡遇到下一波浪潮而沿着海滩坡度延伸的浪潮。这种相互作用将在海滩区域进行调查，在海滩的区域中，它们破裂后被海浪润湿和干燥，在技术上被称为swash带。相对运动波产生的水运动相互作用将在波浪水槽中进行实验室实验。实验将详细测量在沙质底部附近流动，那里的沙子悬浮在水柱中。这些过程决定了海滩发射还是更宽。无论是偷猎犬还是变平。这项研究将为未来的努力提供信息，以通过数学模型模仿海滩。该项目将支持一名博士生和6名本科研究实习生。实习生将通过UW-Madison工程学院的一项课程从代表性不足的团体中招募。本科实习生将在海浪上设计示威活动的“科学星期六”，这是针对K-12学生的活动。该项目将研究海滩偏离区域的波动流相互作用。相互作用将与包括成功的固体波的实验室实验（在波浪水槽中）进行研究。实验将旨在测量边界层动力学和沉积物重悬。流相互作用决定了海滩上的积聚与侵蚀平衡，并塑造了海滩的形态。该研究将提出在SWASH区域的沉积物传输参数，并为未来的数值模型验证提供信息。该项目将支持一名博士生和6名REU，该博士学位将通过UW工程学院的一项课程从代表性不足的小组中招募。本科生将针对K-12学生设计“科学星期六”的演示。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准来诚实地通过评估来诚实地支持。