Pour une analyse des impacts du changement climatique sur l’hydrologie urbaine : Modélisation hydro-microclimatique de deux bassins versants expérimentaux de l'agglomération nantaise

Abstract : Adapting growing cities to climate change is a major challenge in planning policy. Promoting the integration of green and blue infrastructures in the urban environment as adaptation strategies implies understanding their impacts on both the urban hydrological and energy balance. A hydro-microclimate model,TEB-Hydro, was developed previously, taking into account detailed coupling between the two balances. However, first model evaluation studies on different urban catchments have questioned the representation of the hydrological processes in the urban subsoil. This PhD work consists of performing new developments on the models hydrological component (soil-water drainage by sewer networks, vertical and lateral subsoil flows). After calibration a hydrological evaluation is performed on two urban catchments in Nantes. In both cases, the calibration brings out the same simulation configuration, despite different catchment related properties. This is encouraging for applying the model on climate projection. The hydrological evaluation highlights the model key parameters as well as shows improvements concerning sewer soilwater infiltration processes. In addition, a hydro-energetic evaluation shows a satisfactory representation of sensible and latent heat fluxes. The model operation vis-à vis evapotranspiration processes is discussed through vegetation and urban morphology. A first application of TEB-Hydro in climate change context enables evaluating an existing statistical disaggregation method as well as raises the problematic in representing rainfall dynamics for climate projection purposes.
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Xenia Stavropulos-Laffaille. Pour une analyse des impacts du changement climatique sur l’hydrologie urbaine : Modélisation hydro-microclimatique de deux bassins versants expérimentaux de l'agglomération nantaise. Génie civil. École centrale de Nantes, 2019. Français. ⟨NNT : 2019ECDN0007⟩. ⟨tel-02120908⟩

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