Modelling and Assessing Surge Wave Impacts on Hydrodynamic Mixing and Transport

模拟和评估浪涌波对水动力混合和传输的影响

• 批准号: RGPIN-2020-06101
• 负责人: KarimpourGhannadi, Shooka
• 金额: $ 1.89万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=758060
• 关键词: Modelling; Assessing; Surge; Wave; Impacts

Extreme natural events such as tsunamis, floods, and storm surges are highly destructive phenomena that adversely impact human health and ecosystem. Moreover, tsunamic and storm activities will undergo changes (in terms of their intensity and frequency) associated with climate change. During large coastal storms, surge waves induce significant landscape changes and prompt the transport of contaminants and debris from land to water. Namely, the tsunami after the Great East Japan Earthquake in 2011 pushed a vast amount of in-land debris into the ocean, equivalent to thousands of years of normal litter from Japan's coastline. Surge waves have a transient and unprecedented nature. One of the key features of the surge waves is the rapid spatial and temporal deformations of the water's free-surface. Wave propagation and its breaking create intense turbulent flow in the vicinity of the wave's front. The interplay between turbulent properties, free-surface deformation, and large quantities of entrained air governs the dynamics of mixing and transport in surge waves. Numerical and experimental modeling expand our capability to accurately predict the potential risks of these hydro-hazards in the context of sustainable development. The proposed research program enhances our understanding of surge-induced mixing and turbulence. We aim to develop and implement computational and experimental techniques to gather detailed evidence associated with various turbulence mechanisms, such as shear layer, wave breaking, and streamwise advective secondary flows. Identifying the dominant turbulent flow regimes will help us investigate the surge-induced transport and its implications on redistribution of debris and contaminants. There are rising concerns over the impacts of climate change on weather, precipitation patterns, and on the intensity of tsunami and surge waves. In order to design resilient communities and address the social and ecosystem vulnerability during such events, it is critical to understand the detailed hydrodynamic behaviour of hydro-hazards and their interactions with their surrounding environment. The outcome of this research will help us anticipate and mitigate the impacts of increasingly prevalent hydro-hazards on natural patterns of turbulent mixing and transport.

海啸，洪水和暴风雨等极端自然事件是高度破坏性的现象，对人类健康和生态系统产生不利影响。此外，海啸和风暴活动将发生与气候变化相关的变化（就其强度和频率而言）。在巨大的沿海风暴中，潮汐波会引起巨大的景观变化，并促使污染物和碎屑从陆地到水的运输。也就是说，2011年东日本大地震发生后的海啸将大量的陆地碎片推向了海洋，相当于日本海岸线的数千年的正常垃圾。潮波具有短暂的和前所未有的性质。潮波的关键特征之一是水的自由表面的快速空间和时间变形。波传播及其破裂在波浪前附近产生了强烈的湍流。湍流特性，自由表面变形和大量夹带的空气之间的相互作用决定了潮波中混合和传输的动力学。数值和实验模型扩大了我们的能力，以准确预测可持续发展的水域的潜在风险。拟议的研究计划增强了我们对激发诱导的混合和湍流的理解。我们旨在开发和实施计算和实验技术，以收集与各种湍流机制相关的详细证据，例如剪切层，波浪破裂和流向对流的二次流。确定主要的湍流状态将有助于我们调查激增引起的运输及其对碎屑和污染物重新分布的影响。 人们对气候变化对天气，降水模式以及海啸和涌现波的强度的影响引起了人们的关注。为了设计有弹性的社区并解决此类事件期间的社会和生态系统脆弱性，了解水危机的详细流体动力行为及其与周围环境的相互作用至关重要。这项研究的结果将有助于我们预期并减轻越来越普遍的水危对湍流混合和运输自然模式的影响。