Étude hydrodynamique des écoulements côtiers pour la cartographie des risques d’inondation : application aux basses côtes de la ville de Québec

Abstract

Future climate projections indicate that average sea levels are expected to rise, increasing the frequency and severity of coastal flooding around the world, particularly in Canada. Flood risk mapping is an essential tool for supporting decision-making in coastal regions. This research aims to assess the risk of coastal flooding in the low-lying areas of Quebec City. It uses a TELEMAC-2D hydrodynamic model to represent water level changes and flow velocities to assess the danger and define crisis management and evacuation strategies. This research aims to validate a 2D hydrodynamic model at the level of the St. Lawrence River estuary and then apply it to a real flood event. The model is based on the fusion of high-resolution topographic and bathymetric data to capture flow in urban areas. The treatment of the wet/dry front was studied to highlight the sensitivity of numerical stability. Next, different strategies for representing urban buildings, namely Building Hole (BH) and Building Block (BB), were compared to quantify their effects on flow and velocity distribution in urbanised floodplains. The study also examined the role of wind integration, both uniform and non-uniform. In situ measurements and observations collected during the event were also incorporated into the model. The results illustrate that high-resolution event-based hydrodynamic modelling can effectively support operational coastal flood forecasting and risk mapping.

Date	23 Feb 2026
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Damien Pham Van Bang (Supervisor)