A GIS-Based Hydrogeological Approach to the Assessment of the Groundwater Circulation in the Ischia Volcanic Island (Italy)

• DOI: 10.3389/feart.2022.883719
• Publication Date: 2022-08-04T08:44:05Z
• Authors: Silvia Fabbrocino; Eliana Bellucci S...; Sandro de Vita; Mauro Antonio Di ...; Rosario Avino; Enrica Marotta
• Keywords: hydrothermal system; conceptual model; Science; Q; GIS; volcanic island hydrogeology; 01 natural sciences; 6. Clean water; 13. Climate action; Ischia Island; groundwater map; groundwater map, hydrothermal system, conceptual model, volcanic island hydrogeology, spatial interpolation, GIS, Ischia Island; spatial interpolation; 0105 earth and related environmental sciences

Assessing the variations in space and time of groundwater circulation volcanic islands is paramount importance to description hydro-geo-thermal system implementation hydrogeological, geochemical, monitoring systems. In fact, reliable reconstruction potentiometric surface such composite aquifer systems can enable identification most advantageous strategies for both sustainable use resources management risk. Geographical Information System (GIS) platforms support integration analysis many spatial temporal variables derived from active volcanoes elaboration spatially continuous data. However, open issues still affect reliability general applicability common interpolation methods case surfaces. This related assessment main stratigraphic volcano-tectonic features affecting hydraulic head changes. With regard dynamically very Ischia Island (Italy), this study illustrates a GIS-based hydrogeological approach identify accurate method mapping complex terrains. The proposed has been applied existing dataset (1977–2003) stored by Istituto Nazionale di Geofisica e Vulcanologia. Based on careful geological survey, total 267 wells, 5 250 m depth, were processed. data pre-processing involved four meteorological time-series (1922–1997) six long records piezometric water levels (1930–1994). As result, knowledge delineation rather homogeneous structures at basin-scale improved. Thus, new, more surfaces geothermal areas closest coast produced during dry wet seasons. processed was then validated comparing with complementary field These findings point toward an optimal representing seasonal areal distribution parameters Finally, insights into hydrological behavior area will foster understanding possible involvement fresh thermal waters triggering phreatic explosions.