Osservazione delle zone marine costiere da dati ottici multi-sensore: il caso studio della foce del Volturno

This work is framed within the flag project RITMARE (Italian Research for the SEA, from 2012 to 2016, MIUR-CNR) which aim is to study, monitor, manage and give importance to the marine resource in Italy. Remote sensing is an integral part of the project and in this study it is applied to the coastal area of the Volturno river mouth. The study makes use of three images acquired by satellite and airborne sensors. In particular, the following scenes were processed: RapidEye (2013), Landsat-8 OLI (2014) and MIVIS (2011). In-situ measures of water reflectance and water components' concentration: chlorophyll-a (Chl-a), total suspended sediment (TSM) and colored dissolved organic matter (CDOM), were collected during a field campaign held in August 2014. Remote sensing data were geocoded, co-registered and pre-processed in order to correct radiometric and atmospheric effects. The images were then processed to classify coastal marine waters according to different degrees of optical complexity and to produce maps of Chl-a, TSM and CDOM concentration. In particular, a semi-empirical approach based on correlation analysis between in-situ reflectance data (eg. band ratios) and the relative measures of Chl-a, TSM and CDOM concentrations, was applied for the retrieval of water component concentrations' maps. The results show an increasing gradient of optical complexity moving from the pelagic zone to the coastal areas. In these areas the analysis of OLI data show a spatial variability of Chl-a, TSM and CDOM probably due to the hydrological regimes of the Volturno River.