## 4 Results and Discussion
### Demonstration Case of 15-17 September 2020. Test of the Integration of the Analyzed Variables  
For the period of three days (15-17 September 2020), an integrated analysis of data from the in situ monitoring networks, field campaigns and satellite-derived products, was performed to study the evolution of suspended sediment fluxes. This period was characterized by relatively calm weather with moderate meteo-marine conditions (maximum wind speed less than 8 m s\({}^{-1}\) from NE-E for the whole period). As discussed in Section 4.5, once natural external forcing such as wind and waves are excluded, the transport dynamics in the inlets is only driven by the tidal currents and the trend of fluxes are mainly modulated by the tidal signal, in particular by the semidiurnal tide. In the investigated period, tidal circulation was characterized by a spring tide with a marked diurnal inequality and with a maximum excursion of about 1.1 m in the night phase (Figure 10a). Wind speed was always lower than 7 m s\({}^{-1}\) with variable directions ranging from north-west to south (Figure 10b). For the station TRP, the trend of discharge, estimated from the index-velocity regression (Figure 5), showed a slight asymmetry towards the ebb phase. The maximum instantaneous discharges were about 5500 m\({}^{3}\) s\({}^{-1}\) at SN and 2300 m\({}^{3}\) s\({}^{-1}\) at TRP, for an overall discharge of 7800 m\({}^{3}\) s\({}^{-1}\) through the Lido inlet channel (Figure 10c). The trends of turbidity measured at fixed TRP and SN stations were quite similar and clearly modulated by the tide. Relatively higher values were found at TRP, where the average was 8.3 FNU, compared to 5.5 FNU at SN (Figure 10d). Turbidity peaked during the ebb-tide phase with the highest observed values in correspondence to the maximum tidal excursions, typically about 2 h after the occurrence of discharge and velocity peaks. At TRP, maximum turbidity values reached 17.5 FNU at 3:00 AM on 17 September. A peak of 16.5 FNU was also observed at SN on the same day in correspondence to the maximum discharge in the flood tidal phase. The vertically averaged turbidity from ADCPs backscatter (Figure 10e) reached values of 15.3 FNU at TRP and 21 FNU at SN during the peak of water discharge on 17 September. The satellite-derived turbidity maps of the period 15-17 September (Figure 11) provide a synoptic view of the turbidity pattern in the whole investigated area at the time of each daily overpass, around 10:00 AM. The turbidity values retrieved from the satellite images in proximity of the fixed stations ranged between 3 to 6 FNU and were consistent with the range measured by the turbidimeters at the time of the satellite overpasses (blue vertical lines in Figure 10d). There was a slight difference in turbidity between SN and TRP channels with a delta of about 2 FNU that is observable from both the satellite turbidity maps and the time series of turbidity measured at fixed stations, indicating that the difference represents an environmental variation and not an instrumental bias. Although the satellite acquisitions were around the late flood/early ebb-tide phase in the three days, the three scenes represented slightly different hydrodynamical conditions, because of the about 45 min daily delay of the astronomical tide, local lag and flow inertia. On 15 September, the image was acquired 1:30 h after the high tide at the Lido Sud tide gauge station: the measured flow was still entering at TRP (\(-\)271 m\({}^{3}\) s\({}^{-1}\)) while it was already ebbing at SN (651 m\({}^{3}\) s\({}^{-1}\)) (Figure 10c). This opposite behaviour is typical of the two channels at the flow reversal and is due to a different inertia of the two sub-basins. On the 16 th and on the 17 th, the flow entered both channels and the discharge magnitude increased with the increasing tide delay (\(-\)972 at TRP and \(-\)976 m\({}^{3}\) s\({}^{-1}\) at SN on 16 th; \(-\)1477 at TRP and \(-\)1668 m\({}^{3}\) s\({}^{-1}\) at SN on 17 th).