RT Journal Article T1 An accelerated tool for flood modelling based on Iber A1 García Feal, Orlando A1 González Cao, José A1 Gómez Gesteira, Ramon A1 Cea, Luis A1 Domínguez Alonso, José Manuel A1 Formella, Arno K1 2502.02 Climatología Aplicada K1 3301.12 Hidrodinámica K1 2509.19 Análisis del Tiempo K1 1203.11 Logicales de Ordenadores AB This paper presents Iber+, a new parallel code based on the numerical model Iber for two-dimensional (2D) flood inundation modelling. The new implementation, which is coded in C++ and takes advantage of the parallelization functionalities both on CPUs (central processing units) and GPUs (graphics processing units), was validated using different benchmark cases and compared, in terms of numerical output and computational efficiency, with other well-known hydraulic software packages. Depending on the complexity of the specific test case, the new parallel implementation can achieve speedups up to two orders of magnitude when compared with the standard version. The speedup is especially remarkable for the GPU parallelization that uses Nvidia CUDA (compute unified device architecture). The efficiency is as good as the one provided by some of the most popular hydraulic models. We also present the application of Iber+ to model an extreme flash flood that took place in the Spanish Pyrenees in October 2012. The new implementation was used to simulate 24 h of real time in roughly eight minutes of computing time, while the standard version needed more than 15 h. This huge improvement in computational efficiency opens up the possibility of using the code for real-time forecasting of flood events in early-warning systems, in order to help decision making under hazardous events that need a fast intervention to deploy countermeasures. PB Water SN 2073-4441 YR 2018 FD 2018-10-16 LK http://hdl.handle.net/11093/1868 UL http://hdl.handle.net/11093/1868 LA eng NO Water, 10(10): 1459 (2018) NO IMDROFLOOD | Ref. PCIN-2015-243 DS Investigo RD 12-feb-2025