Résumé
The Brague river (France) often encounters flash floods, resulting in consequent damages. The cities of Biot and Antibes were particularly affected in October 2015. This flood event was previously studied using both hydrological and hydraulic approaches, such as 2D hydraulic modelling tools (Basilisk, HEC-RAS and TELEMAC-2D) and the FEV approach. Here, we propose to restart from a previous existing numerical model built with TELEMAC-2D, which simulates the flood event of 2015 in the Brague floodplain. This work aims to assess an HPC performance of TELEMAC-2D for this specific case study based on speed-up, efficiency or energy cost, with the goal of estimating optimal configurations for running simulation efficiently. The results show that TELEMAC-2D is strongly scalable. The optimal configuration of cluster nodes and CPUs for a simulation depends on the metric considered, available resources, and the calculation to be performed. Particular attention is paid to energy consumption, which remains poorly studied -at least in the field of hydraulic modelling used on HPC -but is of the utmost importance in the current climatic context. The energy consumption to reach a same solution varies significantly between configurations, up to a difference of 80 %.