| Domenico Guida1, Michele Guida2, Albina Cuomo1, Davide Guadagnuolo2, Antonia
Longobardi1, Vincenzo Siervo3
1 Dipartimento di Ingegneria Civile dell’Università di Salerno
2 Dipartimento di Fisica dell’Università di Salerno
3 C.U.G. RI., Salerno
Groundwater and surface water resources management represents a present
key issue, both in the hydrogeological and the hydrological fields. An integrated
approach, accounting for hydrogeological, hydrological, geochemical and biological
features can be a valuable tool, being fundamental in karstic landscape because
of the great system variability and because of the frequently complex anthropic
interaction.
In this study we focus on a particular case study, the Bussento river basin, located in the
Campania region, Southern Italy, which is well known to hydrogeology and geomorphology
scientists for its karstic features, as summit highland with dolines and poljes, lowland with
blind valleys, disappearing streams into sinkholes and cave systems. The catchment
groundwater circulation is very complex and frequently groundwater inflows from the outside
of the hydrological watershed and groundwater outflows toward surrounding drainage
systems occur. We aim at propose a validation of a conceptual hydro-geological model
(Guida D. et al., 1980; Iaccarino G., et al., 1986; e Guida D. et al.,1988, Guida D. et al.,
2005) and to this purpose a measurements campaign, of about one year, has been
undertaken along the Bussento for the acquisition of data about the Rn222 concentration
in the waters, using a Rad7 water probe and a Rad7H2O (Durridge Inc., South
Australia). Besides radon concentration, more chemical and physical variables have
been measured, such as pH, water temperature, dissolved oxygen, atmospheric
pressure, water conductivity, water resistivity. The preliminary results enable us to
consider this as an useful methodology for the localization of the contributions of the
groundwaters, diffused along the riverbed, and for their proportional assessment compared
with the superficial back return flow. This program will allow at the end of the
investigation to have an innovative methodology for the separation of quick, delayed,
return flows from the base-flow, due to groundwater contributions as a function of
groundwater recharge and hydrological and geomorphological river bed dynamics. |