Advances in Computational Models for Simulation of Sediment Dynamics in Alluvial Rivers

冲积河泥沙动力学模拟计算模型研究进展

• 批准号: RGPIN-2015-05691
• 负责人: Li, SSamuel
• 金额: $ 1.46万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=657500
• 关键词: Advances; Computational; Models; Simulation; Sediment

The applicant proposes to conduct research on the transport, erosion, and deposition of bed sediments in alluvial river channels under both open-water and ice-covered conditions. This proposed research has a large number of direct applications. Examples of such applications include the control of river floods, safe design and operation of river hydraulic structures, water resources planning and management, and fish habitat restoration and protection. These are important issues facing the Canadian population, engineers and policy-makers across this country. The proposed research program demonstrates its relevance in the pursuit of addressing these issues in a scientifically sound manner.***The problem of riverbed sediment dynamics is poorly understood, due to the complex interaction between the flowing water and the underlying mobile riverbed. Winter ice grips virtually all the Canadian rivers. However, the current knowledge concerning ice-effects on sediment dynamics is very incomplete. In this proposal, the applicant intends to develop efficient and cost-effective computer models for generating predictions of sediment transport, erosion and deposition in turbulent river flows. These models will be verified by comparing model predictions with measurements from field programs and laboratory experiments.***The long-term goal of the proposed research program is to: 1) develop modelling and analysing strategies and apply them to solving practical problems related to water resources planning and management; and 2) develop reliable and cost-effective prediction tools for use with field and laboratory data. The short-term objectives are to: 1) improve existing predictive methods; 2) develop and verify new methods needed for the prediction of sediment dynamics in open-water and ice-covered river flows; and 3) advance three-dimensional modelling capacities and contribute to improved knowledge of complex mobile-bed river flow.***The originality and innovative aspect of the proposed research lies in distinguishing the boundary-layer flow immediately above a mobile riverbed from free-stream flow further above and in introducing computationally efficient hybrid techniques within a computer model of sediment dynamics. The applicant will explore hybrid techniques that couple analytical/semi-analytical functions with numerical solutions to the conservation equations, in order to enhance the description of near-boundary flow.***This proposed research program will potentially make broader contributions to improving interdisciplinary hydraulic and hydrological modelling, to facilitating system predictions for the riverine and adjacent environments, and to understanding the impact of anthropogenic activities and changing natural conditions on the environments. This program will create opportunities for training graduate students at both the doctoral and Master's levels.**

申请人提议对开放水域和冰覆盖条件下冲积河道中沉积物的迁移、侵蚀和沉积进行研究。这项研究有大量的直接应用。此类应用的示例包括河流洪水控制、河流水工建筑物的安全设计和运行、水资源规划和管理以及鱼类栖息地恢复和保护。这些是加拿大民众、工程师和政策制定者面临的重要问题。拟议的研究计划证明了其以科学合理的方式解决这些问题的相关性。***由于流动的水和下面的移动河床之间复杂的相互作用，人们对河床沉积物动力学问题知之甚少。冬季冰几乎覆盖了加拿大所有的河流。然而，目前关于冰对沉积物动力学影响的知识非常不完整。在该提案中，申请人打算开发高效且具有成本效益的计算机模型，用于生成湍流河流中泥沙输送、侵蚀和沉积的预测。这些模型将通过将模型预测与现场项目和实验室实验的测量结果进行比较来验证。***拟议研究计划的长期目标是：1）开发建模和分析策略并将其应用于解决与水资源规划和管理； 2) 开发可靠且具有成本效益的预测工具，用于现场和实验室数据。短期目标是：1）改进现有的预测方法； 2）开发和验证预测开放水域和冰覆盖河流中沉积物动力学所需的新方法； 3) 提高三维建模能力，有助于提高对复杂移动河床水流的认识。***本研究的原创性和创新性在于区分移动河床正上方的边界层水流和自由河床水流。上面进一步介绍了河流的流动，并在沉积物动力学的计算机模型中引入了计算高效的混合技术。申请人将探索将解析/半解析函数与守恒方程数值解相结合的混合技术，以增强对近边界流的描述。***这项拟议的研究计划将有可能为改善跨学科水力学做出更广泛的贡献和水文建模，以促进对河流和邻近环境的系统预测，并了解人类活动和不断变化的自然条件对环境的影响。该计划将为培养博士和硕士水平的研究生创造机会。**