Flood risk management in urban areas adjacent to the coast is essential to increase their resilience. This study aims at improving scientific knowledge of flood risk alongside estuaries, considering different hazards and integrating estuarine and urban drainage modelling. Mathematical modelling of stormwater systems is a useful tool to evaluate the susceptibility to flooding and identify potential measures to reduce flood risk. The assessment of urban drainage flooding uses a coupled 1D/2D model, applying 1D model to the underground system and 2D model for the surface component. Assessment scenarios were based on variables rainfall, estuarine water level, and degree of obstruction in sewers and at system outfalls. Estuarine hydrodynamics were simulated using the SCHISM‐WWM model. A web GIS platform was developed to support urban flood risk forecast and management providing urban analysis visualisation. The main objective is to forecast flooding in the Dafundo catchment supporting definition of population warnings. This paper proposes a flood risk assessment approach, using 1D/2D coupled modelling, estuarine hydrodynamics, integrating the assessment in a forecast web platform. The novelty is supporting an integrated flood risk management in stormwater systems, particularly in estuarine areas, providing an important improvement to assess flooding occurrence, regarding flood depth, area and duration.

中文翻译：

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支持河口地区城市洪水风险管理的1D / 2D雨水建模：Dafundo案例研究中的危害评估

沿海地区城市的洪水风险管理对于提高其抗灾能力至关重要。这项研究旨在提高河口和河口的科学知识，考虑不同的灾害并整合河口和城市排水模型。雨水系统的数学模型是评估洪水敏感性和确定降低洪水风险的潜在措施的有用工具。对城市排水洪水的评估使用耦合的1D / 2D模型，将1D模型应用于地下系统，将2D模型应用于地表分量。评估方案基于变量降雨，河口水位，下水道和系统排污口的阻塞程度。使用SCHISM-WWM模型模拟河口水动力。开发了一个Web GIS平台来支持城市洪水风险预测和管理，以提供城市分析可视化。主要目的是预测达丰多流域的洪灾，以支持人口预警的定义。本文提出了一种洪水风险评估方法，该方法使用1D / 2D耦合建模，河口流体动力学，并将评估结果集成到了预测网络平台中。这种新颖性支持在雨水系统中，特别是在河口地区的洪水风险综合管理，在评估洪水发生的深度，面积和持续时间方面提供了重要的改进。使用1D / 2D耦合建模，河口流体动力学，将评估结果集成到预测网络平台中。这种新颖性支持在雨水系统中，特别是在河口地区的洪水风险综合管理，在评估洪水发生的深度，面积和持续时间方面提供了重要的改进。使用1D / 2D耦合建模，河口流体动力学，将评估结果集成到预测网络平台中。这种新颖性支持在雨水系统中，特别是在河口地区的洪水风险综合管理，在评估洪水发生的深度，面积和持续时间方面提供了重要的改进。