## 4 Results and Discussion
In colors are reported the expected extension of land flooding in 2050 and 2100 for (**a**) RCP 2.6 and (**b**) RCP 8.5 climatic scenarios for a mean land subsidence at \(7\pm 2.5\) mm/year. The expected maximum loss of land is 2.378 km\({}^{2}\) (high-resolution maps are inserted in Supplementary Materials Maps S6 and S7). Figure 14: The bay of the Asinaro river mouth, near Piccio. In colors are reported the expected extension of land flooding in 2050 and 2100 for (**a**) RCP 2.6 and (**b**) RCP 8.5 climatic scenarios for a mean land subsidence at 8 \(\pm\) 2.5 mm/year. The expected maximum loss of land is 0.045 km\({}^{2}\) (high-resolution maps are inserted in Supplementary Materials Maps S10 and S11). Figure 13: The coast of Marzamemi. In colors are reported the expected extension of flooding in 2050 and 2100 for (**a**) RCP 2.6 and (**b**) RCP 8.5 climatic scenarios. The expected maximum loss of land is 0.043 km\({}^{2}\) (high-resolution maps are inserted in Supplementary Materials Maps S8 and S9). VLM are about null except for the area of the modern harbor (at the bottom in the figure), which is affected by a subsidence at 1.02 \(\pm\) 2.5 mm/year. Because the GNSS stations are often too sparse and far from the investigated areas (Figure 2), we preferred to use the VLM rates obtained from the InSAR analysis to assess the local VLM trend and to calculate the expected RSLR values. It is worth noting that the VLM velocities obtained from the InSAR data coincides with the GNSS velocities at the individual stations with an uncertainty of \(\pm\)2.5 mm. The expected flooding scenarios reported in Figures 10-15 are based on VLM values shown in Figure 5. Maps are referred to the RCP 2.6 (low emission) and RCP 8.5 (high emission) climatic scenarios reported in the SROCC Report ([PERSON] et al., 2016), for which SLR is accelerated by land subsidence as estimated by geodetic analysis. The multi-temporal coastal positions projected on the high-resolution topography extracted from LiDAR data, allow to detail the potential flooding extension and the related impacts on the investigated coasts (Table 2). For the RCP 8.5 emission scenario, the maximum extension of expected flooded area for 2100 A.D. in the investigated zone, is about 9.7 km\({}^{2}\). \begin{table}
\begin{tabular}{c c c c c} \hline
**VLM (mm/year)** & **RCP 2.6** & **RCP 2.6** & **RCP 8.5** & **RCP 8.5** \\
**2050 (m)** & **2100 (m)** & **2050 (m)** & **2100 (m)** \\ \hline Null VLM & 0.15 \(\pm\) 0.03 & 0.33 \(\pm\) 0.06 & 0.20 \(\pm\) 0.04 & 0.72 \(\pm\) 0.13 \\ GNSS: \(-\)0.7 \(\pm\) 0.35 & 0.16 \(\pm\) 0.03 & 0.36 \(\pm\) 0.06 & 0.21 \(\pm\) 0.04 & 0.75 \(\pm\) 0.13 \\ InSAR: \(-\)2.0 \(\pm\) 2.5 & 0.20 \(\pm\)0.04 & 0.47 \(\pm\) 0.07 & 0.26 \(\pm\)0.05 & 0.86 \(\pm\) 0.13 \\ InSAR: \(-\)3.4 \(\pm\) 2.5 & 0.25 \(\pm\) 0.04 & 0.59 \(\pm\) 0.07 & 0.30 \(\pm\) 0.05 & 0.97 \(\pm\) 0.13 \\ InSAR: \(-\)5.2 \(\pm\) 2.5 & 0.31 \(\pm\) 0.04 & 0.74 \(\pm\) 0.07 & 0.36 \(\pm\) 0.05 & 1.12 \(\pm\) 0.13 \\ InSAR: \(-\)7.6 \(\pm\) 2.5 & 0.39 \(\pm\) 0.04 & 0.94 \(\pm\) 0.07 & 0.44 \(\pm\) 0.05 & 1.32 \(\pm\) 0.13 \\ InSAR: \(-\)8.0 \(\pm\) 2.5 & 0.40 \(\pm\) 0.04 & 0.97 \(\pm\) 0.07 & 0.46 \(\pm\) 0.05 & 1.35 \(\pm\) 0.13 \\ InSAR: \(-\)8.7 \(\pm\) 2.5 & 0.42 \(\pm\) 0.04 & 1.03 \(\pm\) 0.07 & 0.48 \(\pm\) 0.05 & 1.41 \(\pm\) 0.13 \\ InSAR: \(-\)10.0 \(\pm\) 2.5 & 0.47 \(\pm\) 0.04 & 1.13 \(\pm\) 0.07 & 0.52 \(\pm\) 0.05 & 1.52 \(\pm\) 0.13 \\ \hline \end{tabular}
\end{table} 
Table 1: Relative sea-levels projections for RCP 2.6 and RCP 8.5 scenarios for 2050 and 2100 with respect to 2016, for different VLM rates observed in this study in south-eastern Sicily. Uncertainties define the 90% confidence limits. Different cases are considered for: (i) null vertical land motion (only the contribution of GIA already included in the SROCC projections is considered); (ii) mean VLM at \(-\)0.7 \(\pm\) 0.35 mm/year derived by GNSS data and (iii) observed values of VLM estimated by InSAR analysis along the coastal zones reported in Figure 5.  
Figure 15: The bay of Vendciari.