## 1 Introduction
The average magnitude of tidal exchanges between the Lagoon of Venice and the open sea, determined from time series of flow recorded by acoustic Doppler current profilers (ADCP), equals to 10,000 m\({}^{3}\) s\({}^{-1}\)[26], and the solid flux estimated by the conversion of acoustic backscatter from ADCP [25] shows a tendency to a loss of sediments for an overall volume of 3.8 \(\times\) 10\({}^{5}\) m\({}^{3}\) yr\({}^{-1}\). The water and sediment exchanges between the sea and the lagoon were also extensively studied using numerical models and validated with in situ data [19; 24; 27; 28; 29], showing that sediment transport through the inlets occurs mostly in suspension, while bedload represents only a limited fraction and is related to bedforms migration [30], likely induced by tidal flow asymmetry [20]. Alterations in sediment transport pathways and erosive processes (e.g., bottom scour) also occur after the recent inlet transformation, as shown by local bathymetric changes of the inlet systems [31]. Since 2004, the morphology of the Venice Lagoon inlets has been strongly modified by the construction of MoSE infrastructures, with consequent changes in both velocity field and sea-lagoon exchanges [32]. Further improvement in the modeling chain is then needed to better understand the effects of these changes within the complex framework of physical processes controlling the sediment budget. Observational strategies still represent the most straightforward approach to address the study of sediment dynamics in tidal environments. Remote sensing techniques allow the spatial limitations of traditional in situ measurements to be overcome, providing a synoptic view for a better understanding of the relevant surficial processes [33] and for the calibration and validation of sediment transport models [34]. If acoustics represent a useful tool for the studies of transport in the water column, optical remote sensing methods now enable the investigation of sediment transport processes at the surface on a wider spatial scale, providing synoptic maps of suspended sediment distribution [35] on large areas. The frequent revisit time (few days) of current satellite constellations adds a further benefit that is the possibility to investigate the evolution of transport processes in the medium to short-term (i.e., sea storms or river floods) during cloud-free periods. Few researchers focused on the transport at the inlet in the period from the completion of the MoSE infrastructures (2010) to the start of its operativity (2020); therefore, in addition to theoretical studies, it becomes fundamental to acquire current and updated information on the evolution of the sea-lagoon exchanges with a continuous monitoring of the fluxes of water and sediments through the inlets, and also with investigations on a wider spatial scale to identify sources and pathways of the organic and inorganic particulate transport. The objective of this work is to test the capability of an integrated method for the autonomous estimate of water and sediment fluxes through the northern inlet of the Lagoon of Venice (Lido inlet). The long-term datasets from the in situ network were analyzed in order to evaluate the temporal variability of suspended sediment in relation to tidal phases and meteo-marine conditions. The capability of this integrated observation system has been tested over a study period of three days, characterized by calm weather conditions when the pattern of resuspension was not affected by wind waves or swells.