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Taniguchi, M.
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Taniguchi, M.
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- 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 AccessPreface(2009)
; ; ; ; ; ;Taniguchi, M. ;Dausman, A. ;Howard, K. ;Polemio, M. ;Lakshmanan, E.; ; ; ; ; ;Taniguchi, M. ;Dausman, A. ;Howard, K. ;Polemio, M.Lakshmanan, E.Population growth, urbanization and global climate change have increased urban and agricultural water demands, stressing aquifer systems where groundwater is a source of water supply. The availability and utility of groundwater may further be threatened by factors stressing the quality of groundwater, such as industrial and domestic wastes and agricultural intensification. Consequences include, for example, over-allocation of groundwater, groundwater overdraft, declining well yields and land subsidence; degraded groundwater quality due to mobilization of natural pollutants (arsenic), salt contamination caused by seawater intrusion; increased demand for conjunctively used surface water, and resulting conflicts with junior users; and streamflow capture and resulting damage to ecosystems. These consequences may occur incrementally and inequitably across an aquifer. Natural environmental problems can further complicate use of groundwater and increase strain on the aquifer system; for example, underground structures, geothermal heating (such as heat islands), and geochemical evolution (such as karst formation, excessive salinity, acidity, fluoride, radioactivity, hardness, or turbidity). To address this issue, a joint symposium on the Trends and Sustainability of Groundwater in Highly Stressed Aquifers was held during the 8th Scientific Assembly of the International Association of Hydrological Sciences, IAHS, and the 37th Congress of the International Association of Hydrogeology, IAH, in Hyderabad, India, September 2009. The symposium was organized by the IAHS International Commission on Groundwater (ICGW), supported IAH and by the IAHS International Commission on Water Quality (ICWQ). This symposium brought together scientists, including modellers, geochemists and hydro-geologists, with water supply managers and policy makers to discuss scientific and management ideas and approaches for improving the sustainability of highly stressed aquifers. The importance of this topic was reflected in the large number of contributions to the symposium. Selected papers from this symposium have been compiled in this volume. The editors gratefully acknowledge the assistance of the reviewers who made valuable contributions to this volume. We thank Penny Perrins and Cate Gardner from IAHS Press for their professional approach and help with the processing of the manuscripts.99 141