MIKE URBAN 城市洪水模拟DHI.pdfVIP

Urban Flooding using Modeling 城市洪水模拟 Gunvor Tychsen Philip DHI China Urban Flooding Risk Everywhere 世界各地都面临城市雨洪风险 Prague (Czech Republic) Dhaka City (Bangladesh) WHY do we get flooded? 为何城市洪水频发？ • Sewer systems development slower than the city development 管网发展速度与城市化进程脱节 • Increasing population density in cities and increasing imperviousness 城市人口的增加和不透水地面的增加 • River regulation causing unforeseen problems in nearby cities 周边城市河道调度所导致的不可预见问题 • Changing weather conditions 气候变化 • City expansion in flood hazard areas 城市规划问题 Etc. FLOOD DAMAGES 洪水造成的损失 • Direct damages/直接损失 • Indirect damages/ 间接损失 • Social consequences/社会问题 FLOODS... Living with floods – Challenges 洪水带来的挑战 • Acceptance of flooding in cities, based on informed decisions 基于合理的决策，接受在城市中发生洪水 • City planning laws 城市规划和法规 • Roads as elements in flood mitigation strategies 道路作为城市洪水减少对策的基本元素 Conscious acts to deal with situations of water above ground • Avoid contact between mixed waste water and storm water 避免污水和雨水的混合 • Protection of vital infrastructure electricity-, water-, heat, communication and hospitals 保护重要的设施 相关电力、水、热能的设施以及通讯和医院 • Economic consideration of community damage 社会损失的经济学评估 • Necessary preparedness to deal with extreme events 充足准备以应对极端情况 Solutions 解决方案 • Enlarge and extend sewer system and build retention basins 扩大和扩充管网系统并建造蓄水设施 • Real time control for optimal use of storage capacity in the system 实时控制以优化系统的储水能力 • Flood forecasting 洪水预警 Numerical modelling is needed! 需要数学模拟辅助 1D sewer network model principles 一维管网模型原理 1D-1D drainage network model 1D-1D管网模型 Dual drainage concept 2D Flood Modeling/二维洪水模拟 1D pipe flow and 2D overland flow 一维管