Coupling Urban Water and Energy Budgets with TEB-Hydro: Case Study on the French Catchment Pin Sec

Abstract

In view of climate change and demographic pressure in cities, Sustainable Urban Drainage Systems (SUDs) have become essential to urban planners. Understanding their influence on the urban microclimate (energy and water budgets) at city scale is essential for developing adaptation strategies to global change. The hydro-microclimate model TEB-Hydro enables treating the water and energy budgets with the same level of detail. Its hydrological component has been improved recently and the hydrological processes have been evaluated. However, it has not yet been investigated how those changes affect the energy component of the model. Therefore, the model is applied to a long-term instrumented urban catchment in Western France, allowing its evaluation on water and energy fluxes. The comparison of the simulated total sewer discharge to observations shows a correct KGE criterion of 0.79, with a tendency of overestimation of the model. The maximal daily observed latent heat fluxes, on the contrary, are mostly underestimated. However, taking into account a source area analysis of the observed turbulent heat fluxes achieves better results while comparing them to simulation.