VYUŽITÍ MAGNETICKÉ SUSCEPTIBILITY A DALŠÍCH PROSTŘEDKŮ PRO STUDIUM POVODŇOVÝCH SEDIMENTŮ V ANTROPOGENNĚ OVLIVNĚNÉ NIVĚ ŘEKY OLŠE
Magnetic susceptibility (MS) is very useful proxy for determination of anthropogenic pollution in environment, also in fluvial sediments. In this paper MS was used as the lead method for the anthropogenic impact and floodplain development determination. Sedimentary records of total six cores were examined in the Olše River floodplain. Besides MS measurements other laboratory analyses (loss on ignition, grain-size analyses) were done. This set of laboratory analyses was supported by study of the old maps, historical aerial photos and archive river management and flood records. The stream path in the study area was significantly influences by 1930s channelization. The study area also lies in very industrial region where the coal extraction, attached steel production and fly ashes concentration culminated in 1980s and has been decreasing from that time. The basic assumption for sedimentary record interpretation was that MS peak determines the 1980s.
According to MS measurement upper fines of all investigated cores are very young because they are completely magnetically enhanced. Most of them were evidently deposited on the former gravel streambed aft er the 1930s channelization. Also high mass specific MS values were reported (14.72–382.09 × 10-8 m3/kg).
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