The area of Q10% flood in the over-flood terrace is characterized by irregularity in longitudinal valley profile. The areas of flat, bright flood terrace with small slope in cross-section appears rarely. This kind of stream will run often under deep erosion conditions and the terrace of small dimensions appears on one or both riversides depending on hypsometry and the stream situation. In these conditions the plants cover low water banks and the bushes are dominating the floods plain. This influence during the flood event causes the impact of plants on the flow. The direct effects are: the narrowing downstream and concentrating main flow area in the central part of the low water stage cross-section, changes in velocity profile on the flood terrace with plants as in the transitional plants adjacent area and in the central part of the stream bed. The plants on flood plain are contributing to increase the velocity also in the bottom zone of main channel. The subject of this paper is the analysis of water flow process inside of plants occupying the zone on flood terrace and its indirect influence on hydrodynamic stability of the main part of channel. Due to the influence of plants during ...
This paper aims to improve the reliability of the determination of flow resistance and hydraulic effects of vegetation. For this reason, laboratory flume studies with living vegetation were employed. The most notable finding was that, when compared to leafless conditions, the presence of leaves increased the friction factor up. This was strongly dependent on the flow velocity. The work shows the results of studies conducted in water laboratory the Department of Hydraulic En-gineering the Poznan University of Life Sciences and Institute of Environmental Engineering Wrocław University of Environmental and Life Sciences. Subject of research done on hydraulic was to assess the direct natural vegetation under the influence of water flow. To analyze this phenomenon adopted the model of water resistance movement on vegetation. To designate determined resistance forces in-cluding vegetation structure and flow by above it.
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