INTEGRATION OF LIDAR AND 3D MODELLING FOR THE ANALYSIS OF A FLOODING EVENT

Abstract. Laser scanner technology can be very useful for applications relative to surveying river-beds with high and very high resolution (sampling heights at one meter spacing or less). A 3D model of structures including the river-bed, sides and contiguous areas allows to develop rigorous hydraulic models relative to flooding predictions and to the estimation of relative damages. In the field of hydraulic modelling, an important role has been played by 3D modelling when the flooding of the Bacchiglione River in 2010. Laser scanner techniques have been used for the rapid and accurate definition of which areas are prone to high risk and to potential damage in the case of bursting of river banks. The results allow estimating the amount of safety in particular cases which depend on the presence of natural and/or artificial protection structures which prevent devastation of houses or other human-made artefacts by acting as an obstacle to the water flow.