Figure 1

(a) MODIS Ocean Colour image on 17 November 2012 showing the suspended sediment plume; the yellow box around the Tiber River mouth represents the area where reflectances (Rrs) were extracted; the box shows the Tiber river delta evolution2. The image was created using data downloaded from the NASA (oceancolor.gsfc.nasa.gov) and processed using SeaDAS 7.2 (ref. 55); (b) Qw and the total volume concentration of suspended particles (VCtot) time series (plot generated by using MATLAB 7.1 http://uk.mathworks.com/products/matlab); VCtot is obtained from the sum of the two volume concentrations of the grain fractions considered in this work, i.e., 3.9 µm–62.5 µm and 62.5 µm – 125 µm.