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Investigation of sedimentation rates and sediment dynamics in Danube Delta lake system Romania by Pb dating method J Environ Radioact. Epub Jun Electronic address: hedvigsimon yahoo. Kogălniceanu BlvdSector 5,Bucharest, Romania.

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DOI: Being a sensible to all processes occurring in its catchment area, information is stored in the deposited sediments, which can be used as tracers for natural and anthropogenic processes. The aim of this study is to determine a detailed reconstruction of the sedimentation rates in the last century by applying the Pb dating method validated by Cs profiles.

Additionally, the impacts of the construction of river-regulating structures mainly the Iron Gates Hydro-Energetic Power Plants are investigated, along with the assessment of natural phenomena floods, storms etc. To achieve this, 26 sediment cores from seven lakes were collected.

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From the assessed lakes, the most affected was the Matița Lake with a maximum sedimentation rate of Average sedimentation rates are: 0. Physical parameters water content, porosity and bulk density and LOI organic matter and inorganic carbon content were determined for each core to differentiate organic and non-organic sedimentation. Beside the natural influences, it is difficult to track the effects of the Iron Gates and not all analysed lakes were suitable for this task.

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Sedimentation rates show growths of 3 times afterthe most affected being the two northern lakes 3 times increase in both Matița Lake and Merhei Lake and the four central lakes 2 times in case of Cuibida Lake, 3 times in Iacob Lake, 3 times in Isac Lake and 4 times in Uzlina Lake with an average increase of 3 times, while the southern one Cruhlig Lake 2 times.

Keywords: Pb dating method; Danube delta; Sedimentation rates.

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