Geographia Polonica (2010) vol. 83, iss. 1

Overbank sediments along the middle Wieprza as a record of flood phenomena

Jacek Kaczmarzyk, Wacław Florek

Geographia Polonica (2010) vol. 83, iss. 1, pp. 13-24 | Full text
doi: https://doi.org/GPol.2010.1.2

Abstract

Today’s fl ood events along the River Wieprza assume a quite characteristic course entailingcalm spillovers of water from the bed in places of riverbank lowering and in sections above andbelow bridges, where a narrowing of the channel is present. The identity of the land inundated relatesto morphology, the near-channel part of a fl oodplain may be affected or those parts in depressions thatserve as fl ood basins.Riverbank exposures on both sides of the present river channel plus pits reveal the construction of theWieprza fl oodplain. The sediments that build the fl oodplain represent channel and overbank facieswith subfacies of palaeomeander fi lls. Analysed exposures are located along the valley section betweenSławsko and Staniewice, mostly in close proximity to the Early Mediaeval fortifi ed site ofWrześnica. The content of the exposures indicates that the uniform cover of overbank sedimentsacross the fl oodplain emerged during the last 1000 years. It is now impossible to say when exactly, soit is unknown what the rank of the extreme fl oods which took place at the end of 19th century was, andwhat their role in forming the present fl oodplain.

Keywords: paleomeanders, Holocene, overbank deposits, fl ood, fl oodplain, Medieval fortifi ed site, Wieprza river.

Jacek Kaczmarzyk, Department of Geomorphology and Quaternary Geology, Institute of Geograpghy and Regional Studies, Pomeranian University in Słupsk, Partyzantów 27, 76-200 Słupsk, Poland
Wacław Florek, Department of Geomorphology and Quaternary Geology, Institute of Geograpghy and Regional Studies, Pomeranian University in Słupsk, Partyzantów 27, 76-200 Słupsk, Poland