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. The monitoring of hazardous events through changedetection has an important role in the emergency management. Such actionscan be performed shortly after the hazardous event for first rapid mappingbut also over longer periods of time for recovery purposes and risk mapping.The use of medium resolution free-of-charge multi-spectral satellite imageryfor purposes of flood extension and impact monitoring can be extremelyvaluable due to their ability to offer an “easy” and remote access toinformation, even in cases of extreme weather conditions, but also due totheir high compatibility with GIS environments. The case study regards CentaRiver estuary that hosts an important archaeological site of Albenga withinthe boundaries of its riverbed. The authors propose a workflow that usesCopernicus Sentinel-2 data to provide the comparison changes firstly in thesingle relevant bands and successively in the indexes NDVI e NDWI, suitablefor the estimation of water component. The results of this study were usefulfor observing the extension of the flooded area, to evaluate its impact onthe archaeological remains and to further propose more targeted UAV-born andground survey.

Damages from extreme flooding events to cultural heritage and landscapes: water component estimation for Centa River (Albenga, Italy)