Optimization of the Two-Dimensional Hydrodynamic Model for the Ottawa River

渥太华河二维水动力模型的优化

• 批准号: 549707-2019
• 负责人: Mohammadian, Abdolmajid
• 金额: $ 2.84万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=701013
• 关键词: Optimization; Two; Dimensional; Hydrodynamic; Model

An accurate and fast estimation of the current flow fields in rivers is crucial for sound planning of flooding prevention, environmental impact assessment, responding to environmental emergencies related to spill of hazardous substances, resource management, and assessment socio-economical impacts of climate change. With the advance in computing techniques, numerical modeling of river hydraulics has become feasible and popular. However, most of the existing models and modelling works that were remained at the academic level and/or were developed to achieve very specific engineering projects, such as the design of hydrotechnical structures and assessment of floodplain. Very limited river modelling projects have been escalated to the operational level in which high-quality current are being predicted continuously integrating the continuous fluctuations in the environmental conditions to respond to operational needs. And when river models are run operationally, there mostly one dimensional and used to assess water level. This research aims primarily to design and optimize a two-dimensional hydrodynamic model for the Ottawa River for operational applications to support emergency response in that water system. Specifically, the first objective of this project is the develop a two-dimensional hydrodynamic model for the Ottawa River from Chat Falls to Carillon to predict horizontal current field with high special resolution to capture complex flow patterns, such as flow recirculation and dispersion. The second objective is to optimize the computational costs without lowering the prediction accuracy, based on a comprehensive analysis of the influence of local mesh resolution on the calculated water level, current velocity, and secondary flows, etc. The developed model will be carefully calibrated and validated against observational data. The computational mesh of the developed model will be highly optimized and this optimization can significantly increase the model efficiency without obviously impacting the model accuracy. This research includes preparing a digital elevation model based on height, Open Street, and navigational maps with the assistance of ArcGIS, determining the computational area, generating various meshes using different setting parameters in BlueKenue, conducting mesh sensitivity analyses and performing simulations using TELEMAC, calibrating the models, and preparing a technical report to describe the study and its findings.

准确、快速地估算河流水流场对于防洪规划、环境影响评价、应对危险物质泄漏、资源管理以及评估气候变化的社会经济影响至关重要。随着计算技术的进步，河流水力学数值模拟已成为一种可行和流行的方法。然而，大多数现有的模型和建模工作仍然停留在学术层面和/或为实现非常具体的工程项目而开发，如设计水利工程结构和评估洪泛区。非常有限的河流模拟项目已升级到业务层面，其中不断预测高质量的水流，并结合环境条件的持续波动，以满足业务需求。而在河流模型业务化运行时，多为一维模型，用于水位评估。本研究的主要目的是设计和优化一个二维水动力学模型的渥太华河的业务应用，以支持在该水系统的应急响应。 具体而言，本项目的第一个目标是开发一个二维的渥太华河从查特福尔斯到卡里永的水动力学模型，以预测具有高分辨率的水平流场，以捕捉复杂的流动模式，如流动再循环和分散。第二个目标是在不降低预报精度的前提下，综合分析局部网格分辨率对计算水位、流速、二次流等的影响，优化计算成本。 将根据观测数据仔细校准和验证所开发的模型。 所开发的模型的计算网格将被高度优化，这种优化可以显着提高模型的效率，而不会明显影响模型的精度。这项研究包括准备一个数字高程模型的基础上的高度，开放的街道，导航地图与ArcGIS的帮助下，确定计算区域，生成各种网格使用不同的设置参数在BlueKenue，进行网格敏感性分析和使用TELEMAC进行模拟，校准模型，并准备一份技术报告，以描述研究及其结果。