TELEMAC-2D Upgrades: Rainfall Spatialization and Control Sections

Over the past 30 years, the frequency of natural disasters related to intense rainfall events has increased due to climate change. In this context, hydrodynamic rainfall-runoff modelling is of paramount importance to understand and predict the consequences of climate change. It is therefore essential to make advances in this field, particularly by improving runoff modelling through numerical solution of river hydrodynamics equations, as done by the TELEMAC-2D model. In this paper, we present a method for integrating spatialized rainfall into the calculation of net rainfall, using the SCS-CN model integrated in TELEMAC-2D. We have added a module that allows us to consider spatialized rainfall from radar rainfall products, such as the Antilope products from Météo France, satellite data or even rain gauge data if we have a dense network of rain gauges in the area to be modelled. This module assigns to each node of the TELEMAC-2D mesh the value of the nearest rain pixel. We have applied this method for rainfall-runoff hydrodynamic model of the Real Collobrier catchment in the Var, with a surface area of about 92 km2. New variables are also added to the control section module of TELEMAC-2D.