2:30 PM - 2:45 PM
[SVC49-10] Features of Numerical Model “Ballista”; the Ballistic Simulator of Explosive Volcanic Eruption
Keywords:Ballistc projectiles, Explosive eruption, Topography, Resolution, Numerical Model, Graphical User Interface
In the presentation, we show how local conditions and terrain can affect the model by running the same simulations with and without topography, but also by modifying the resolution of the topography to study these effects. The resolution of the digital elevation model (DEM) only changes the large scale distribution of ballistics on the ground when the grid size is fairly large (> 100 m). Results also show that including topography in the calculation changes the travel distance and the spatial distribution of particles significantly. When examined in detail, in particular locations the high resolution DEM can be used to identify shelter areas where ballistic hazard is reduced, for example, behind large boulders or buildings - risk reduction strategy that proved successful for hikers caught in the 2014 eruption. In our presentation, we discuss such topographic dependency of the Ballista quantitatively.
Finally, we have made the model public by a creating graphical user interface and a user guide in order to contribute to the disaster risk management.