Long-term spatio-temporal hydrochemical and^ sup 222^ Rn tracing to investigate groundwater flow and water-rock interaction in the Gran Sasso (central Italy) carbonate aquifer

摘要: In the Gran Sasso fissured carbonate aquifer (central Italy), a long-term (2001-2007) spatio-temporal hydrochemical and^ sup 222^ Rn tracing survey was performed with the goal to investigate groundwater flow and water-rock interaction. Analyses of the physico-chemical parameters, and comparisons of multichemical and characteristic ratios in space and time, and subsequent statistical analyses, permitted a characterisation of the hydrogeology. At the regional scale, groundwater flows from recharge areas to the springs located at the aquifer boundaries, with a gradual increase of mineralisation and temperature along its flowpaths. However, the parameters of each group of springs may significantly deviate from the regional trend owing to fast flows and to the geological setting of the discharge spring areas, as corroborated by statistical data. Along regional flowpaths, the effects of seasonal recharge and lowering …