Document Detail

Characterisation of submarine groundwater discharge offshore south-eastern Sicily.
MedLine Citation:
PMID:  16757069     Owner:  NLM     Status:  MEDLINE    
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 12Ls(-1), which are comparable with the total SGD flux in the basin of 17Ls(-1) obtained from radon measurements. The integrated SGD flux over the Donnalucata coast estimated on the basis of Ra isotopes was around 60m(3)s(-1) per km of the coast. Spatial variations of SGD were observed in the Donnalucata boat basin, the average (222)Rn activity concentration in seawater varied from approximately 0.1kBqm(-3) to 3.7kBqm(-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 (222)Rn activity concentration on the tide. The (222)Rn concentrations in seawater varied from 2.3kBqm(-3) during high tides to 4.8kBqm(-3) during low tides, thus confirming an influence of the tide on submarine groundwater discharge. Stable isotopes (delta(2)H and delta(18)O) 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.
P P Povinec; P K Aggarwal; A Aureli; W C Burnett; E A Kontar; K M Kulkarni; W S Moore; R Rajar; M Taniguchi; J-F Comanducci; G Cusimano; H Dulaiova; L Gatto; M Groening; S Hauser; I Levy-Palomo; B Oregioni; Y R Ozorovich; A M G Privitera; M A Schiavo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-06-06
Journal Detail:
Title:  Journal of environmental radioactivity     Volume:  89     ISSN:  0265-931X     ISO Abbreviation:  J Environ Radioact     Publication Date:  2006  
Date Detail:
Created Date:  2006-06-26     Completed Date:  2006-12-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508119     Medline TA:  J Environ Radioact     Country:  England    
Other Details:
Languages:  eng     Pagination:  81-101     Citation Subset:  IM    
International Atomic Energy Agency, Marine Environment Laboratory, Monte Carlo MC-98000, Monaco.
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MeSH Terms
Water Pollutants / analysis*
Reg. No./Substance:
0/Water Pollutants

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