报告题目：荷兰水智能：下一代水动力模型核心
Dutch Water Intelligence：The next generation hydrodynamic modelling
报告时间：2022年10月13日15:00－16:30
报告地点：腾讯会议 ID：228 828 559
报 告 人：叶清华高级研究员(荷兰三角洲研究院/代尔夫特理工大学)
主 持 人：尹小玲副教授（水利工程系）
欢迎广大师生参加。
土木与交通学院
2022年10月8日
报告人简介：
叶清华，男，工学博士，现为荷兰三角洲研究院海岸河口动力地貌方向高级研究员\咨询专家，也是Delft理工大学土木工程和地球科学系兼职副教授，硕士与博士生导师。主要研究领域包括基于物理过程的河口、海岸和河流动力地貌数值模拟技术、生物动力地貌模型、浮泥和泥沙输移理论和水质模型、气候变化及适应对策以及海平面上升应对措施等等；开创性的把不同尺度动力地貌物理过程和生态动力学过程耦合在一起，奠定了生态动力地貌学数值模拟的理论框架；所开发的动力生态、动力地貌数学模型及其理论成果已被成功应用于世界各地的生态恢复、生态河口整治、滨海地带湿地恢复和生态工程研究和实践中，代表着生态动力地貌数值模拟技术的国际领先水平，是国际先进水动力-水质模型Delft3D模型的开发者之一。参与主持了多项荷兰和中国国家自然基金委重点国际(地区)合作研究项目，以及科技部国家重点研发计划政府间国际科技创新合作重点专项。
Dr. Ye, Qinghua has broad experience in the fields of sediment transport, morphology, and numerical modelling, including physical process-based modelling, numerical methods and corresponding solvers, high performance computing (HPC). He recently worked on projects on Building with Nature, where he developed an integrated tool considering the interaction of wind, surface water, vegetation, wave, sediment transport and groundwater for wetland systems.
He is also one of the developers of the world-leading 3D/2D modelling suite, Delft3D for integral water solutions. His PhD research focused on an integrated geomorphologic model system to study the effect of ecology/biology change on geomorphology in salt marshes and wetlands.
After a MSc degree on coastal engineering and sediment transport, he was employed in the renowned Nanjing Hydraulic Research Institute, China. In 2012, Dr Ye completed his PhD in Civil Technology and Geoscience from the Delft University of Technology and UNESCO-IHE.
In addition to numerous technical reports, depicting the results of the various projects involved, Dr Ye has authored and/or co-authored many papers on mentioned subjects at international conferences and in technical journals.
报告摘要：
数值模拟是湖泊、河流、河口和海岸等复杂水动力和水环境研究重要和基本方法。Delft3D由Deltares（前身Delft Hydraulics）开发，是适用于海岸、河流、湖泊与河口水沙动力与水环境数值模拟的大型专业开源数值模拟工具，在全世界得到广泛应用。自2011年开始开发以来，Delft3D的新一代核心Delft3D Flexible Mesh灵活网格版本逐渐完善，已经在全世界180多个合作伙伴处测试应用。Delft3D Flexible Mesh，顾名思义，可以在一个模型中使用多种网格，用户可以同时在一个模型中进行一维线性、二维平面和立面以及三维计算。模型的这种灵活性可以克服单一网格解析自然界各种复杂地形边界时的缺点，同时保留原有的水流、泥沙、水质等完全集成环境，可用于各种内河、河口、海岸、近海区域的一、二、三维耦合计算。用一个模型即能模拟二维（水平或垂向）和三维的水流、波浪、盐度、热量、污染物输移、水质、生态、泥沙输移和床底地貌，以及各个过程之间的相互作用。它是目前世界上最先进的水动力-水质模型之一，同时其高精度并行技术也得到更好的运用。其主要特征是：所有子模块都具有高度的整合性和互操作性；能直接应用最新物理、化学、生物过程；图形用户界面（GUI）也更为友好。目前，该软件在全世界得到了广泛的应用和测试，在研究地形演变、咸潮上溯、环境评估、航道整治、洪水演进、城市水管理、河湖治理等诸多方面获得了令人满意的成果。
本报告将从以下三方面来开展介绍
1.基本物理过程、控制方程及数值计算方法；
2.典型案例验证，质量守恒性，动量守恒性，网格收敛性，数值精度，亚网格尺度处理，并行效率等；
3.特殊模块包含数字同化模块及应用、船行波、污染物扩散等应用。最后，对数值模型应用的研究进展进行综述。
Numerical simulation becomes an essential and fundamental technique to study complex hydrodynamic and hydro-environment in lakes, rivers, estuaries, and coastal zones. Delft3D is an open-source software system, developed by Deltares for a few decades and has been the world's most widely used computational engines. From 2012, the next generation Delft3D computational kernel Delft3D Flexible Mesh has been under development. Till today it has been applied by more than 180 partners worldwide. Delft3D FM is a shallow-water flow solver, based on the finite-volume method on unstructured grids. The method is suitable for flows that occur in rivers, channels, sewer systems (1D), shallow seas, rivers, overland flow (2D), and estuaries, lakes and shelf breaks (3D). It is the most advanced computational kernel integrating hydrodynamic, wave, water quality, sediment transport and morphology change modelling. A modernized GIS based GUI helps model applicability. Parallelization and high-performance computing techniques have been applied.
In this presentation, we will start firstly over the fundamental physical processes, governing equation and numerical methods; Secondly, a few validation results will be shown about mass conservation, momentum conservation, grid convergence, numerical accuracy, subgrid scale processes and parallel performance; Lastly a few special modules, e.g. data assimilation, ship-induced waves, pollutant dispersion and applications will be discussed.