Laser scanner and multibeam application addressed to geomorphological hazard evaluation of rocky coast

How the application of remote sensing techniques can support and be used in the evaluation of geomorphological hazard has currently a great interest and relevance within land planning and management strategies in coastal areas. In the framework of rocky coastal environment, where it is necessary to get a large amount of georeferenced data both at sea and inland, we believe that remote sensing techniques, allow the acquisition of the whole information in a single and integrated survey campaign. This is very effec-tive both in term of time and cost. Within this topical issue, we carried out a survey of rock coast and seabottom of Gallinara Island (Western Liguria, Italy) with the aim to produce a geomorphological map of the emerged and submerged coastal zone particularly addressed to the evaluation of the susceptibility of sea cliffs instability. It is a small island with an extent of 0,11 km2 and a maximum elevation of 87 m a.s.l. The integrated survey has been fulfilled using a Laser Scanner RIEGL mod. LMS-Z420i, a MultiBeam (MBES) R2Sonic 2024 and a GPS 5700 TRIMBLE in RTK (Real Time Kinematic) configuration. The coastal survey has been carried out by a boat properly equipped for the simultaneous acquisition of data on the Teledyne Reson PDS2000 platform. By the implementation with GIS tools, a continuos 3D model reconstruction has been performed both for emerged and submerged coastal zone together with geological and geomorphological data.