Zmiany morfologiczne cofki zbiornika Jeziorsko na tle przemian dna doliny Warty między Woźnikami a Uniejowem w antropocenie
Morphological changes in the backwater of the Jeziorsko Reservoir against the background of changes in the bottom of the Warta River valley between the Widawka estuary and Uniejów town in the Anthropocene

Summary/Abstract: The article analyses the youngest morphological changes in the central section of the Warta valley floor betweenWoźniki village and Uniejów town. Although various manifestations of human impact have been recorded in landformsand sediments since at least the Bronze Age, these processes became more intense in the first half of the 19th century. At thattime, the construction and expansion of flood embankments, carried out in stages, was of great importance, as was the con-struction of the Jeziorsko Dam Reservoir with accompanying hydrotechnical structures and devices. The flood embankmentsin sections outside the reservoir resulted in a radical separation of morphogenetic processes in the area between the embank-ments and in the outer two belts of the embankment. In the vicinity of the Jeziorsko Reservoir, characteristic morphodynamiczones with variable process dynamics have developed, functioning depending on water level fluctuations and flow variabilityin the Warta riverbed: the coastal zone and the delta zone of the reservoir. The research, focused on a detailed analysisof changes in the relief of the delta, allowed to prove that a single flood can change the degree of siltation of the reservoir, justlike several dozen years of constant accumulation. It was also found that the effects of floods can be better assessed only aftera few years rather than after a few months after the event.

• Details
• Contents