Abstract
ABSTRACTGeomorphological survey and mapping of the emerged and submerged coastal areas, particularly addressed to evaluate sea cliff instability within the assessment of coastal hazard and risk mitigation measures, require high resolution and georeferenced spatial data. Remote sensing techniques fully satisfy these needs and allow to obtain all information in a single short-lived survey campaign. An integrated survey by means of laser scanner and multibeam techniques coupled with aerial photos interpretation has been experienced along the rocky coast of the Gallinara Island (Western Liguria, Italy). The small extent of Gallinara, together with its particular meteo-marine climate conditions, makes the island a noteworthy case study. Multibeam and laser scanner technologies allowed to reconstruct the submerged and emerged rocky coast at high resolution. The accuracy of the 3D surface reconstructed by means of laser scanner used in profiler mode was tested and validated, by comparing with the static laser scanner survey method. The resulting data allowed to obtain significant geological and geomorphological information leading to the definition of rocky cliff stability conditions.
Highlights
The rapid technological evolution of remote sensing survey techniques has led many researches to focus on their integration and on the management and elaboration of the huge amount of resulting data
In the framework of rocky coastal environment, where it is necessary to get detailed georeferenced data both at sea and inland, remote sensing techniques allow the acquisition of the whole information in a single and integrated survey campaign
The boat was equipped by the Teledyne Reson PDS2000 platform, for the simultaneous acquisition of a MultiBeam EchoSounder (MBES) R2Sonic 2024 (Brennan, 2009), a Sound Velocity Profiler (SVP) RESON mod
Summary
The rapid technological evolution of remote sensing survey techniques has led many researches to focus on their integration and on the management and elaboration of the huge amount of resulting data (point clouds and Digital Terrain/Surface Models). Survey techniques, such as static or mobile laser scanner, terrestrial or UAV (Unmanned Aerial Vehicles) photogrammetry and multibeam, are nowadays applied to various fields, from the analysis of terrestrial, marine or fluvial environments, to urban areas and cultural heritage. Optimized survey planning and realization, coupled with well-thought processing, allow to obtain high-quality results. In the framework of rocky coastal environment, where it is necessary to get detailed georeferenced data both at sea and inland, remote sensing techniques allow the acquisition of the whole information in a single and integrated survey campaign
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