Climate change is one of the greatest concerns in the current century, with projections indicating a potential 2-meter rise the mean global sea level to 2 meters by the end of the century. The susceptibility to marine submersion of Quebec City makes the Saint Lawrence estuary a privileged territory for hydrodynamic studies. Despite this significance, few studies have been conducted to understand the physical process behind. The numerical modelling has shown its power in understanding the link between physics and the natural environment. This research aims to employ the hydrodynamic modeling technics to describe the coastal flows in Saint-Lawrence fluvial estuary using the TELEMAC 2D model. The model incorporates urban zones of Quebec City to assess the flood risk. Topographic data with high resolution was used to build the urban mesh. A resolution of 2m in the urban area, and a resolution between 50m and 250 m in the river was used in the model. The model was tested to reproduce the flood event of December 2022. To predict the climate change effect and the flood danger, different extreme scenarios of climate change will be tested.

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