The Influence of Vegetation on the Spatial Distribution of Water Velocity in a Regulated Lowland River – Preliminary Results

The paper deals with the study of the influence of vegetation (Sparganiaceae, Batrachium, Ceratophyllaceae, Elodea Michx.) on the hydraulic conditions of water flow in a lowland river.The paper presents the results of measuring the spatial distribution of water table and water velocity in the Nida River.The studied section of the Nida is regulated, with a straight course however, the influence of regulation disappears.Banks and bed of the river are partially overgrown in summer seasons.Rigid vegetation grows on the banks of the Nida, but also covers the bottom with tufts of soft vegetation.Measurements were taken in the summer period during low discharge in Nida (9.15 m 3 s -1 ).Analyses of distribution in hydraulic parameters; water velocities in stream lines or in verticals and the depth variation as a preliminary analysis were presented.