Flood management, mitigation & resilience
Collaborative digital workflows for integrated flood management
Climatic changes, including sea level rise and extreme rainfall events, increased the risk of flood events in the coastal city of Lisbon, located in the mouth of Tagus river. The surrounding areas have also seen rapid urbanization, leading to soil imperviousness, resulting in even more flood occurrences in the region. Lisbon’s existing infrastructure is not adequate to ensure efficient drainage during these storm events, and has a consequence, inundations in Lisbon downtown, have become a recurring event in recent years.
Avoiding the ineffective reactive management approaches from the past (build first - check consequences later), a proactive approach was adopted - the strategy in the Lisbon municipality was to take advantage of the best-available information, knowledge, and technology, to develop a comprehensive Drainage Master Plan and to study different scenarios before implementation.
A state-of-the-art urban flood simulator (UFS) became a key element on the development of this approach, allowing the city to comprehensively model alternative scenarios. This UFS was recently released as OpenFlows FLOOD, which is a Flood Modeling Software with a complete multi-scale 1D/2D approach, specifically designed for dynamic modelling of the complex array of interconnected processes related with urban, riverine and coastal systems. The UFS was used for the development and implementation of a dynamic and integrated model to study the drainage and overland flow for several return periods. The main purpose was to compare the existing situation with the future scenario after the implementation of a tunneling strategy.
The implemented model positively reproduced the inundations occurring in Lisbon downtown recently, and the modelled comparisons allowed the team to clearly identify the proposed solution as a valid and effective option, significantly reducing the inundation area, and allowing to reduce the risks of inadequate and unsustainable decisions on the rehabilitation of drainage infrastructure, which is usually an expensive process.
Presentation given at InterFLOOD Asia 28 March 2019
Innovations in Flood Mitigation, Management & Resilience session chaired by Gerald Fleming, Treasurer, International Association of Broadcast Meteorology
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