The determined target concentrations (CT): Zn –110 mg kg−1, Pb – 30 mg kg−1, Cd – 0.3 mg kg−1 and Hg – 0.05 mg kg−1 are consistent with the mean concentrations specific of average concentrations in shale. On the basis of assessment on geoaccumulation index – Igeo, enrichment factor – EF and contamination index, the area of the Gdańsk Deep is

considered moderately polluted with moderate enrichment of sediments in heavy metals, while the areas of Bornholm Deep and SE Gotland Basin are unpolluted to moderately polluted with minor enrichment of sediments with heavy metals. In the case of assessment based on CF factor, all areas were classified as having moderate status or sub-GES in the 2-class assessment. The obtained results point to differences in characteristics and dynamics of Tofacitinib chemical structure sediment formation in the basins located in the eastern part of the Polish sector of the southern Baltic Sea – Gdańsk Deep and SE Gotland Basin and that in the western part – the Bornholm Deep. The periods of sediment formation in the Gdańsk Deep and SE Gotland Basin are very similar; the deepest layers were respectively dated in 1838 and 1858, while selleck compound the deepest sediment layers from the Bornholm Deep denote a much later period, around 1928, pointing to a faster sedimentation rate in this area. The determined linear sedimentation rates in the Gdańsk Deep (0.18 cm yr−1) and in the SE Gotland Basin (0.14 cm yr−1)

are quite close, and the corresponding mass accumulation rates reached: 0.032 g cm−2 yr−1 and 0.049 g cm−2 yr−1. In the Bornholm Deep higher values of both linear sedimentation (0.31 cm yr−1) and mass accumulation (0.059 g cm−2 yr−1) rates were determined. “
“The lack of sufficient and adequate field data on one hand and the lack of universally accepted equations and parameters on the other hand make the prediction of the sediment transport a challenging topic. Optical devices,

such as transmissometer, which is an appropriate instrument in this regard, associate with some shortcomings. Numerical models also face difficulties to simulate suspended sediment concentration. This investigation focuses on the accuracy of the suspended sediment concentrations (SSC) collected in the field using transmissometer, as well Ketotifen as simulated by a model developed using Delft3D package. For this study Piep tidal channel system located in the southeastern part of the North Sea was selected as the case study. Transmissometer is an optical device had been used to collect SSC along the depth. These data had been collected along at several monitoring points of two cross-sections for duration of one full tidal cycle. To simulate SSC Delft3D software was employed. This software had been used before to simulate the hydrodynamics of the channel (Escobar, 2007). The model was executed for the same period as the measuring cruises.