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Autori: DANIELA VASILACHE, NICOLETA BRIȘAN, ROBERT CSABA BEGY.
The growing interest in the dynamics of floodplains and the important role of alluvial sedimentation in river meadows, which acts as an archive of sediment, have focused on the need to document contemporary and recent sedimentation rates. This paper presents the results obtained of highlighting the major hydrological phenomena for Valea Vinţului and Pian river meadows, located in the Mureş river basin, characterized as high-risk flood areas. For the first time in Romania, 210Pb radiometric method was used to obtain first estimates of sedimentation rate in a floodplain (Valea Vinţului river). After chemical preparation (acid leaching) of alpha spectrometric sources, 210Pb concentrations in the samples were determined by measuring its daughter istope 210Po using the alpha spectrometer ORTEC Soloist, equipped with a PIPS detector with 900 mm2 active surface for recording of alpha particles 5,3 MeV 210Po. Activities from 23±5 to 94±6 Bq/kg 210Pb were found for Valea Vinţului river floodplain. After applying the CRS model (Constant Rate of 210Pb Supply), the results of this method were compared with reports from literature and from Water Management System Alba and there were observed periods of massive depositions due to floodings between 1936 and 2012 (± 2 years) with a alluvial sedimentation rate of 1.863 ± 0.167 up to 6.185 ± 1 g/cm2*y.
Keywords: sedimentation rate, 210Pb dating method, alpha spectrometry, CRS model
