Investigation of Mechanical Properties and Flow Resistance of Flexible Riverbank Vegetation
Tomasz Tymiński1, Tomasz Kałuża2
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1Institute of Environmental Engineering, Wrocław University of Environmental and Life Sciences,
Pl. Grunwaldzki 24, 50-363 Wrocław, Poland
2Department of Hydraulic Engineering, Poznań University of Life Sciences,
Piątkowska 94A, 60-649 Poznań, Poland
Pol. J. Environ. Stud. 2012;21(1):201-207
Flexibility of plants in the inter embankment zone makes them bend, to various degrees, under the force of flowing water. Determination of the mechanical properties is crucial for forecasting the behavior of vegetation and determining the hydrodynamic drag forces resulting from vegetation. This is also directly linked to the water table in the channel. Laboratory measurements were carried out for branches of willow, reed and alder, allowing for the determination of modulus elasticity, modulus of non-dilatational strain, limit of elasticity for the twigs, and their humidity. Mechanical properties of samples under investigation mainly depended on the humidity and species of plants. Experimental results confirmed considerable variability of parameters even within samples coming from a single plant.
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