Analysis of two sources of variability of basin outflow hydrographs computed with the 2D shallow water model Iber: Digital Terrain Model and unstructured mesh size

• Analysis of the combined effect computational mesh and DTM resolutions. Study conducted in 4 basins a total 7 precipitation events. In each basin, 3 resolutions were considered. Rainfall events modelled with fully distributed hydrodynamic 2D-SWE model. Modelling hydrological processes models based on shallow water equations implies high cost, which often limits resolution mesh. Therefore, practice, modellers need to find compromise between spatial resolution, numerical accuracy cost. Moreover, this balance is probably related underlying Digital Terrain Model (DTM). work, it studied size results runtime model 2D equations. Seven rainfall four different have been using DTMs The obtained highlight relevance vertical versus horizontal DTMs. Furthermore, has observed that greater than 25 m, together LiDAR-based provide comparable outflow hydrographs.