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

• 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

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.

这个项目将探讨水的运动，从运行下来的海滩斜坡，因为它遇到了下一个波来了。这种相互作用将在海滩的区域进行研究，该区域在波浪破碎后被波浪润湿和干燥，技术上称为冲洗区。通过波浪水槽实验研究反向运动波浪产生的水运动相互作用。实验将详细测量桑迪底部附近的水流，在那里沙子悬浮在水柱中。这些过程决定了海滩是被侵蚀还是变宽，是变陡还是变陡。这项研究将为未来用数学模型模拟海滩提供信息。该项目将支持一名博士生和6名本科生研究实习生。实习生将通过威斯康星大学麦迪逊分校工程学院的一个项目从代表性不足的群体中招募。本科实习生将为“科学星期六”设计海浪演示，这是面向K-12学生的活动。本计画将研究海滩冲流区的波浪驱动流相互作用。相互作用将研究实验室实验（在波浪水槽），包括连续孤立波。将设计实验来测量边界层动态和沉积物再悬浮。水流相互作用决定了海滩的淤积与侵蚀平衡，并塑造了海滩的形态。这项研究将提出参数化的泥沙输运在冲带，并提供资料，为今后的验证数值模型。该项目将支持一名博士生和6名雷乌斯，他们将通过华盛顿大学工程学院的一个项目从代表性不足的群体中招募。本科生将为面向K-12学生的“科学星期六”设计演示。该奖项反映了NSF的法定使命，并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，被认为值得支持。

项目成果

Enhanced settling and dispersion of inertial particles in surface waves

增强表面波中惯性粒子的沉降和分散

• DOI: 10.1017/jfm.2022.95
• 发表时间: 2022
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: DiBenedetto, Michelle H.;Clark, Laura K.;Pujara, Nimish
• 通讯作者: Pujara, Nimish

HYDRODYNAMICS OF SWASH INTERACTIONS

冲刷相互作用的流体动力学

• DOI: 10.1142/9789811275135_0033
• 发表时间: 2023
• 期刊: Coastal Sediments 2023
• 作者: MEZA-VALLE, CLAUDIO;PUJARA, NIMISH
• 通讯作者: PUJARA, NIMISH

Flow in oscillatory boundary layers over permeable beds

渗透床上方振荡边界层中的流动

• DOI: 10.1063/5.0104305
• 发表时间: 2022
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: Meza-Valle, Claudio;Pujara, Nimish
• 通讯作者: Pujara, Nimish