Recent changes of sedimentation rate in three Vistula Oxbow lakes determined by 210Pb dating

Sediments of three oxbow lakes located in Vistula valley near Warsaw (Poland) were analysed for activity of Pb-210. The sediment age was calculated applying the CRS model. The sedimentation rate was determined for each lake based on the sediment age and thickness under the assumption of constant deposition between dated layers. Sedimentation rate varies in time and between lakes. The major changes of sedimentation rate were correlated with flood events and construction of flood dams that isolate the lakes from the river. The recent differences between the lakes seem to be related to different trophy state and productivity.