1. Department of Information Engineering, Electronics and Telecommunications, Sapienza University of Rome, Rome, Italy
2. CIMA Research Foundation, Campus Universitario Savona, Savona, Italy
3. Department of Earth, Environmental and Physical Sciences, University of Siena, Siena, Italy
4. Department of Earth and Environmental Sciences, University of Pavia, Pavia, Italy
5. Centre for Environmental and Marine Studies (CESAM), Department of Environment and Planning, University of Aveiro, Campus de Santiago, Aveiro, Portugal
6. Coastal and Marine Research Group, University of Wales Trinity Saint David, Swansea, UK