## 6 Conclusions  
The geophysical tests realized at the Hydrogeosite laboratory for testing the capability of ERT and GPR for archaeological purposes in humid and lacustrine scenarios have provided interesting results. In particular, GPR measurements constituted a valid support in humid/lacustrine scenarios, but their usefulness depends strongly on the size and positions of the buried structures as demonstrated in WP1. Furthermore, as shown in WP2, GPR can work very well, both near the banks of rivers and lakes and above the water providing an excellent resolution; however, a crucial role is played in this case by the required investigation depth. The applicability of ERT needs more attention; in particular, the resolution and quality of the electrode contacts should be considered carefully in order to obtain results acceptable from the archaeological point of view. The best results in this work were achieved with analyses carried out with the 3D loop-loop array; whilst the use of the classical 3D array with electrodes equispaced in two directions did not allow to easily localize the archaeological features. This result is very interesting for the applicability of the resistivity methods often not used in urban scenarios where regular disposition of the electrodes are not always fully achievable for the constant presence of obstacle (trees, monuments, urban furniture,  
Figure 20: Comparison of ERT slices at the depths of 0.25 m (**a**), 0.45 m (**b**), 0.70 m (**c**) and 1.00 m (**d**) for the different scenarios in WP1. etc.). In WP2, the 2D ERT profiles have highlighted the capability of the methodology to identify strong anomalies in correspondence of the shallower structures showing the usefulness of the resistivity methods in very conductive scenarios. Despite great efforts carried out for the test, some limitations are difficult to overcome; therefore, a qualitative integration of GPR and ERT data was tried by co-rendering the images. In this research, the integration was effectively created by adopting 3D and 2D data for the WP1 and WP2, respectively, and the results obtained demonstrate, unequivocally, the importance of the comparison and integration of different methodologies for improving the localization and identification of the buried structures in humid and wetland scenarios. In the future, greater efforts will be required to integrate the geophysical data aimed at obtaining quantitative information about the planimetric and volumetric structures placed in the subsoil also involving the use of advanced adopting algorithms (i.e., image data-fusion, machine learning algorithms). At the same time, a further topic of the GPR research analyses will be to identify the best strategies for the migration of the hyperbola in order to make quantitative analyses possible. Conceptualization, E.R., F.P. and L.C. ; methodology, L.C., V.G. and E.R. ; investigation, L.C., F.P., G.D.M., V.G. and E.R. ; data processing, L.C., V.G. and E.R. ; technical supervision, G.D.M. ; writing--original draft preparation, L.C. ; writing--review and editing, E.R., L.C. and V.G. ; visualization, L.C., E.R. and V.G. ; project administration, E.R. and V.L. ; final review, E.R. and V.L. All authors have read and agreed to the published version of the manuscript. The experiments are funded by the Basilicata Region, Progetto PO FSE Basilicata 2007-2013: \"Promozione della ricerca e dell'innovazione e sviluppo di relazioni con il sistema produttivo regionale\" DD n. 796/2013 Azione n. n. 15/AP/05/2013/REG. Not applicable. The data that support the findings of this study are available from the corresponding author upon reasonable request. The experiments were funded by the Basilicata Region, Progetto PO FSE Basilicata 2007-2013: \"Promozione della ricerca e dell'innovazione e sviluppo di relazioni con il sistema produttivo regionale\" DD n. 796/2013 Azione n. n. 15/AP/05/2013/REG. We are grateful to the Director of the CNR Institute of Methodologies for Environmental Analysis for the experimental phase in the Laboratory Hydrogeosite facility.