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Europe during the last thirty years of the 20 th century], Przegląd Geograficzny, vol. 77, 3, 289-310. McCabe G.J., Clark M.P., 2005, Trends and Variability in Snowmelt Runoff in the Western United States, Journal of Hydrometeorology , vol. 6, 476-482. Piętka I., 2008, Rola zasilania śnieżnego w odpływie rzek nizinnych [Importance of snowmelt alimentation of lowland rivers], master’s thesis, Faculty of Geography and Regional Studies, University of Warsaw. Piętka I., 2009, Wieloletnia zmienność wiosennego odpływu rzek polskich [Long-term variations of spring

. Relationships between environmental metrics and water temperature: A case study of Polish lowland rivers. Water and Environment Journal. Vol. 30. No. 1–2 p. 143–150. M alcolm I.A., H annah D.M., D onaghy M.J., S oulsby C., Y oungson A.F. 2004. The influence of riparian woodland on the spatial and temporal variability of stream water temperatures in an upland salmon stream. Hydrology and Earth System Science.Vol. 8. No. 3 p. 449–459. M arszelewski W., P ius B. 2015. Long-term changes in temperature of river waters in the transitional zone of the temperate climate: A

:1020190227581. [6] Dyer SD, Peng C, McAvoy DC, Fendinger NJ, Masscheleyn P, Castillo LV, et al. The influence of untreated wastewater to aquatic communities in the Balatuin River, The Philippines. Chemosphere. 2003:52:43-53. DOI: 10.1016/S0045-6535(03)00269-8. [7] Spänhoff B, Bischof R, Böhme A, Lorenz S, Neumeister K, Nöthlich A, et al. Assessing the impact of effluents from a modern wastewater treatment plant on breakdown of coarse particulate organic matter and benthic macroinvertebrates in a lowland river. Water Air Soil Pollut. 2007;180:119-129. DOI: 10.1007/s11270

REFERENCES Banaszuk, H., 1996. Paleogeography. Natural and anthropogenic transformation of the upper Narew Valley. Ekonomia i Środowisko, ISBN 83-85792-30-9. (In Polish.) Banaszuk, P., Wysocka-Czubaszek, A., 2005. Phosphorus dynamics and fluxes in a lowland river: The Narew Anastomosing River System, NE Poland. Ecol. Eng., 25, 4, 429–441. Bayley, P.B., 1991. The flood pulse advantage and the restoration of river-flood-plain systems. Regul. Rivers: Res. & Manage., 6, 75–86. Brown, J.H., Gillooly, J.F., Allen, A.P., Savage, V.M., West, G.B., 2004. Towards a

- Application of an electrified benthic frame trawl for sampling fish in a very large European river (the Danube River) - Is offshore monitoring necessary? - Fish. Res. 151: 12-19. Witkowski A., Kotusz J., Przybylski M. 2009 - The degree of threat to the freshwater ichthyofauna of Poland: Red list of fishes and lampreys - situation in 2009 - Chroñmy Przyr. Ojcz. 65: 33-52 (in Polish). Wolter C., Freyhof J. 2004 - Diel distribution patterns of fishes in a temperate lowland river - J. Fish Biol. 64: 632-642. Zajicek P., Wolter C. 2018 - The gain of additional sampling methods

. Białystok: Wydawnictwo Uniwersytetu w Białymstoku, 1-236. [12] Hardej, M., & Ozimek, T. (2002). The effect of sewage sludge fl ooding on growth and morphometric parameters of Phragmites australis (Cav.) Trin. ex Steudel. Ecological Engineering , 18, 343-350. [13] Jachniak E. (2011). Ładunki związków biogennych a stopień eutrofi zacji zbiornika zaporowego Kozłowa Góra. Nauka Przyroda Technologie , 5, 4-55. [14] Jarvie, H.P., Neal, C., Williams, R.J., Neal, M., Wickham, H.D., & Hill, L.K. (2002). Phosphorous sources, speciation and dynamics in the lowland River Kennet, UK

. 3. Opracowanie systemu do oceny możliwości forsowania koryta dużych rzek - etap II [Developing a system to evaluate the possibilities of forcing the channels of large rivers - stage II]. Collective work, recorded in the AFIT library No. 10217/50 – 2017. 4. Ostrowski P., Falkowski T., Karczmarz D., Mądrzycki P., Szkudlarz H.: The usefulness of low-altitude aerial photography for the assessment of channel morphodynamics of a lowland river, Annals of Warsaw University of Life Sciences - SGGW Land Reclamation, vol. 49 (2), pp. 96-106, 2017. 5. Ostrowski P

Abstract

The analysis of in situ measurements of velocity distribution in the floodplain of the lowland river has been carried out. The survey area was located on a bypass channel of the Warta River (West of Poland) which is filled with water only in case of flood waves. The floodplain is covered by grassland and reed marsh habitats. The velocity measurements were performed with an acoustic Doppler current profiler (ADCP) in a cross-section with a bed reinforced with concrete slabs. The measured velocities have reflected the differentiated impact of various vegetation types on the loss of water flow energy. The statistical analyses have proven a relationship between the local velocities and the type of plant communities.

Wood Debris in Rivers - One of the Key Factors for Management of the Floodplain Forest Biotope of European Importance

The article deals with analysis and management of wood debris accumulation in the Morava River within the Special Area of Conservation Litovelske Pomoravi (Czech Republic). Wood debris creates interference of interests between nature conservation (requirements for keeping wood debris in the stream) and foresters as well as water managers (requirements for removing wood debris from the flow area of the river). Based on the presented analyses, there was a set of wood debris management measures proposed in Litovelske Pomoravi in order to respect dynamics of fluvial succession series of floodplain forest biotopes, which are included in the Natura 2000 system.

Abstract

The river erosion is a complex process, the dynamics of which is very difficult to predict. Its intensity largely depends on hydraulic conditions of the river channel. However, it is also thought that natural resistance of the subsoil has a great influence on the scale of the erosion process. Predicting the effects of this process is extremely important in the case of constructing a piling structure (for example, artificial reservoirs). The partition of the river channel causes significant lowering of the river channel bed downstream the dam which threatens the stability of hydro technical and engineering (bridges) buildings. To stop this unwanted phenomenon, stabilizing thresholds are built. However, random location of thresholds significantly reduces their effectiveness. Therefore, taking under consideration natural geotechnical conditions of the subsoil appears to be extremely important.

In the light of the current development of in-situ tests in geotechnics, an attempt to use results from these tests to predict the bed erosion rate was made. The analysis includes results from CPTU and DPL tests, which were carried out in the Warta River valley downstream the Jeziorsko reservoir. In the paper, the general diagrams for the procedure of obtaining and processing the data are shown. As a result, the author presents two multidimensional bed erosion rate models built based on hydraulic data and results from CPTU or DPL tests. These models allow taking more effective actions, leading to the neutralization of the effects of the intensive bed erosion process.