Sedimentarni vyvoj pozdne glacialnich jezer u Veseli nad Luznici

While lake deposits are commonly abundant in northern and NW Europe, most of the central Europe (except for the Alpine piedmont and Panonnian basin) is rather poor in this respect. This very much holds for the territory of the Czech Republic, where the absence of lacustrine deposits is explained both by the high relief dynamics of the region and by its unfavorable hydrologic context. From this point of view, the northern part of the Třeboň Basin (South Bohemia) represents extraordinarily important area - in the last few years, 16 lake basins filled by up to 11 m thick sediments have been discovered in this area. These sediments provide unique, high-resolution archives for detailed study of paleoenvironmental changes during the Late Pleistocene and the Holocene in this part of Europe.
Nevertheless, the investigations on detailed lake basins morphology and their sedimentary development have been considerably complicated so far, because almost all lake basins are flooded by waters of modern fishponds. The only known exceptions are the lakes discovered under the surface of wet meadows, in SW vicinity of Veselí nad Lužnicí. In this study we present results of sedimentological and geophysical investigations. Based on the first results obtained from drilled cores and outcrops we are able to conclude that:

Three lake basins are present on the site. Approximate size of the largest one is 750 × 130 m.
Lake basins are filled by up to 6 m thick minero-organic sediment. This sediment is possible to divide to several lithological units, which reflect well the major environmental changes in the wider area.
Based on radiocarbon dating and lithostratigrapfic correlations with other lacustrine records in the area, the sediment accumulated during late Pleniglacial and the Late Glacial.
During interstadials Bolling and Allerod dominated rather autochthonous organic sedimentation and clastic inputs were reduced, whereas during the stadial phases (Older and Younger Dryas), colluvial and aeolian processes were accelerated and lacustrine sediment becomes more minerogenic.
During the Younger Dryas, considerable lake level oscillations occurred (lower lake level during the first part and higher during the latter part), as visible on the outcrop from the littoral part of the lake. Drop of lake level is expected in the Early Holocene.
Holocene part of the sediment is missing probably due to modern agricultural activities.