Meandering Morphodynamics and Related Fluvial Processes

蜿蜒形态动力学及相关河流过程

• 批准号: RGPIN-2018-06186
• 负责人: daSilva, AnaMaria
• 金额: $ 6.27万
• 依托单位: Queen's 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=749318
• 关键词: Meandering; Morphodynamics; Related; Fluvial; Processes

This research program aims at advancing the understanding and analytical treatment of flow and sediment transport processes in straight and meandering rivers, leading to an improved mathematical modelling of key large-scale processes taking place in such rivers. Over the next five years, the research will be carried out along two themes: the dynamics and modeling of the planimetric evolution of meandering streams (Theme A) and large-scale turbulence (Theme B). The research under Theme A focuses on overcoming unresolved issues related to the modeling of meandering flow and its interaction with the stream movable boundary. Under Theme B, the knowledge on large-scale turbulence will be extended to include a first understanding of the dynamics and morphological consequences of large-scale horizontal coherent structures. The specific objectives are as follows: (1) to develop an efficient 2-D hydrodynamic model for the computation of meandering flow, including appropriate parametrizations of three-dimensional effects; (2) to develop new analytical formulations of bank erosion; (3) to develop a numerical model for the computation of long-term planimetric evolution of meandering streams, and use it to test, refine and validate the new formulations of flow and bank erosion resulting from research carried out under objectives 1 and 2; and (4) to penetrate the dynamics of the life-cycle of large-scale turbulence horizontal coherent structures occurring in straight or nearly straight streams, and gain insight into their morphological consequences.For the present purposes, extensive series of laboratory experiments will be conducted in large-scale facilities, including two different 1 m wide, 50 cm deep channels formed by three consecutive meander loops for the meandering studies, and a 21m-long straight flume with adjustable width from 1 to 2m for the turbulence studies. State-of-the-art equipment will be used to obtain detailed records of bed and plan shape morphological adjustments, and measure instantaneous and time-averaged flow velocity fields, and local sediment transport rates. Field data from the literature and unpublished data available from water-related agencies will be gathered, to get further insights into the processes under investigation and enable further testing of the computer models resulting from this research.The new knowledge and tools resulting from the proposed research will be directly applicable to the feasibility analysis, design and optimization of an extensive array of river engineering studies and projects and the development of sound river management guidelines and protocols. The research will result in the training of 5 PhD, 2 MSc and 3 BSc students, who will acquire highly desired, advanced skills in hydraulic physical and numerical modeling, and a deep appreciation of the social, economic and environmental aspects of river engineering and management.

该研究计划旨在促进对笔直和蜿蜒河流中水流和泥沙输运过程的理解和分析处理，从而改进此类河流中发生的关键大规模过程的数学建模。在今后五年中，研究将沿着沿着两个主题进行：曲流（主题A）和大规模湍流（主题B）的平面演变的动力学和建模。主题A下的研究重点是克服与曲流及其与河流活动边界相互作用的建模相关的未解决问题。在主题B下，将扩大关于大尺度湍流的知识，包括初步了解大尺度水平相干结构的动力学和形态学后果。具体目标如下：（1）建立一个有效的二维弯曲水流水动力学模型，包括三维效应的适当参数化：（2）建立新的河岸侵蚀分析公式;（3）建立了一个计算曲流河平面长期演变的数值模型，并进行了检验，完善和验证根据目标1和2开展的研究得出的水流和河岸侵蚀新公式;和（4）穿透在直的或接近直的流中发生的大尺度湍流水平相干结构的生命周期的动力学，并深入了解它们的形态后果。为了目前的目的，将在大型设施中进行广泛的一系列实验室实验，包括由三个连续的曲流环形成的两个不同的1米宽，50厘米深的通道，用于曲流研究，以及一个21米长的直水槽，宽度可从1米到2米调节，用于湍流研究。将使用最先进的设备来获得河床和平面形状形态调整的详细记录，并测量瞬时和时间平均流速场以及当地泥沙输移率。将收集文献中的现场数据和与水有关的机构提供的未发表数据，以进一步了解正在调查的过程，并进一步测试本研究产生的计算机模型。拟议研究产生的新知识和工具将直接适用于可行性分析。设计和优化一系列广泛的河流工程研究和项目，并制定健全的河流管理指南和协议。该研究将导致5名博士，2名硕士和3名理学士学生的培训，他们将获得高度期望的，先进的水力物理和数值模拟技能，以及对河流工程和管理的社会，经济和环境方面的深刻理解。