The Suitability of UAV-Derived DSMs and the Impact of DEM Resolutions on Rockfall Numerical Simulations: A Case Study of the Bouanane Active Scarp, Tétouan, Northern Morocco

Rockfall simulations constitute the first step toward hazard assessments and can guide future rockfall prevention efforts. In this work, we assess impact of digital elevation model (DEM) resolution on accuracy numerical simulation outputs. For purpose, compared output obtained using 1 m, 2 m 3 UAV-derived DEMs, to two other models based coarser topographic data (a 5 DEM through interpolating contours Shuttle Radar Topographic Mission 30m DEM). To generate validation data, conducted field surveys in order map real trajectories three boulders that were detached during a event occurred December 2018. Our findings suggest use low medium-resolution DEMs translated into large errors shape simulated as well computed runout distances, which appeared be exaggerated by such models. The geometry area targets potential events also different from those mapped field. This hindered efficiency any or correction measures. On hand, 1m produced more accurate results relative data. Therefore, it is enough for research applications. Although remote sensing techniques may require additional expenses, our enhanced worth investment.