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Schiavo, M. A.
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Schiavo, M. A.
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- PublicationRestrictedGeochemical characterization of groundwater and submarine discharge in the south-eastern Sicily(2006)
; ; ; ; ;Schiavo, M. A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia ;Hauser, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia ;Gatto, L.; Dipartimento di Geologia e Geodesia, Universita` di Palermo, ;Cusimano, G.; Dipartimento di Geologia e Geodesia, Universita` di Palermo,; ; ; The main results of a hydrogeochemical survey carried out during 2002–2003 along the coast of the south-eastern Sicily, which aimed at geochemical characterization of both groundwater chemistry and submarine groundwater discharge (SGD) in the area are presented. A general frame of chemical processes affecting the studied groundwater and SGD point out that most samples fall within the calcite-anhydrite-dolomite field (CAD). The chemical composition of the samples within the CAD triangle is essentially controlled by calcite, dolomite and gypsum dissolution, which are the main minerals of the carbonate rocks hosting the aquifers. An additional process evidenced in this study is a mixing with seawater. Nitrate is the most typical ion significantly disturbed in the groundwater chemistry influenced by agricultural activities. The strong correlation with SO4 2 indicates that the use of ammonium sulphate fertilisers is widespread in the study area. The K+ vs. NO3 diagram evidences a correlation occurring at lower and higher concentrations, and implies that there is not a common source of both nitrate and potassium, at least on a regional scale. High-phosphate concentration is found in submarine springs along the coast, specifically in the Donnalucata and Avola areas, while its content in inland wells is generally lower. Phosphate is also associated with high-bicarbonate contents in the Donnalucata area, suggesting its possible origin is phosphate-rich carbonate rocks, which are commonly outcropping in the area.126 26 - PublicationRestrictedCharacterization of submarine ground water discharge offshore of south-eastern Sicily-SGD collaboration(2006)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Povinec, P. P.; International Atomic Energy Agency, Marine Environment Laboratory, Monte Carlo MC-98000, Monaco ;Aggarwal, P.; International Atomic Energy Agency, Division of Physical and Chemical Sciences, Vienna, Austria ;Aureli, A.; University of Palermo, National Research Group for the Defence Against Hydrogeological Disasters, Palermo, Italy ;Burnett, W. C.; Florida State University, Department of Oceanography, Tallahassee, FL, USA ;Kontar, E. A.; P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russian Federation ;Kulkarni, K. M.; International Atomic Energy Agency, Division of Physical and Chemical Sciences, Vienna, Austria ;Moore, W. S.; University of South Carolina, Department of Geological Sciences, Columbia, SC, USA ;Rajar, M.; University of Ljubljana, Faculty of Engineering, Ljubljana, Slovenia ;Taniguchi, M.; Research Institute for Humanity and Nature, 335 Takashima, Kamigyo, Kyoto, Japan ;Comanducci, J. F.; International Atomic Energy Agency, Marine Environment Laboratory, Monte Carlo MC-98000, Monaco ;Cusimano, G.; University of Palermo, Department of Geology and Geodesy, Palermo, Italy ;Dulaiova, H.; Florida State University, Department of Oceanography, Tallahassee, FL, USA ;Gatto, L.; University of Palermo, Department of Geology and Geodesy, Palermo, Italy ;Hauser, S.; University of Palermo, Department of Chemistry and Physics of the Earth, Palermo, Italy ;Levi-Palomo, I.; International Atomic Energy Agency, Marine Environment Laboratory, Monte Carlo MC-98000, Monaco ;Ozorovich, Y. R.; Space Research Institute, Russian Academy of Sciences, Moscow, Russian Federation ;Privitera, A. M. G.; University of Palermo, National Research Group for the Defence Against Hydrogeological Disasters, Palermo, Italy ;Schiavo, M. A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; A complex approach in characterisation of submarine groundwater discharge (SGD) off south-eastern Sicily comprising applications of radioactive and non-radioactive tracers, direct seepage measurements, geophysical surveys and a numerical modelling is presented. SGD fluxes in the Donnalucata boat basin were estimated by direct seepage measurements to be from 4 to 12 L s 1, which are comparable with the total SGD flux in the basin of 17 L s 1 obtained from radon measurements. The integrated SGD flux over the Donnalucata coast estimated on the basis of Ra isotopes was around 60 m3 s 1 per km of the coast. Spatial variations of SGD were observed in the Donnalucata boat basin, the average 222Rn activity concentration in seawater varied fromw0.1 kBq m 3 to 3.7 kBq m 3 showing an inverse relationship with salinity. The continuous monitoring carried out at the site closest to the coast has revealed an inverse relationship of 222Rn activity concentration on the tide. The 222Rn concentrations in seawater varied from 2.3 kBq m 3 during high tides to 4.8 kBq m 3 during low tides, thus confirming an influence of the tide on submarine groundwater discharge. Stable isotopes (d2H and d18O) showed that SGD samples consist up to 50% of groundwater. Geo-electrical measurements showed a spatial variability of the salt/ fresh water interface and its complex transformation in the coastal zone. The presented results imply that in the studied Donnalucata site there are at least two different sources of SGD, one superficial, represented by mixed fresh water and seawater, and the second one which originates in a deeper limestone aquifer.208 22 - PublicationOpen AccessIsotope distribution of dissolved carbonate species in southeastern coastal aquifers of Sicily (Italy)(2006)
; ; ; ;Schiavo, M. A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia ;Hauser, S.; Dipartimento di Chimica e Fisica della Terra (CFTA),Università di Palermo, ;Povinec, P. P.; 3Faculty of Mathematics and Physics, University of Bratislava, Mlynska; ; Concentrations of major ions and the 13C composition of dissolved inorganic carbon in groundwater and submarine groundwater discharges (SGD) in the area between Siracusa and Ragusa provinces, southeastern Sicily, representing coastal carbonate aquifers, are presented and discussed. Most of analyzed groundwater belong to Ca-bicarbonate type, in agreement with the geological nature of carbonate host rocks. Carbonate groundwater acquire, beside the dissolution of carbonate minerals, dissolved carbon (and the relative isotopic composition) from the atmosphere and from soil biological activity. In fact, 13C values and TDIC contents show that both these sources contribute to carbon dissolved species in the studied waters. Finally, mixing with seawater resulted the second main factor of groundwater mineralization.112 240