Influence of spatial discretization, underground water storage and glacier melt on a physically-based hydrological model of the Upper Durance River basin

► We model the Upper Durance basin hydrological regime. ► We use a physical-based hydrological model on an alpine catchment. ► Model discretization is based on Relatively Homogeneous Hydrological Units. ► We implement glacier melt and water storage submodules in a hydrological model. ► The model is validated on the intra and interannual variability of discharges.