Author(s): G. V. Zheleznyakov

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Keywords: No Keywords

Abstract: The principle feature of water motion in rivers with the flood plains is the interaction of the main chan- nel and the flood plain flows. The interaction depends on the variations of hydraulic resistances over the flow width. In the areas of flow outlet into the flood plain the zones with high ve locity gradients, in- creased turbulence and active transversal mass exchange appear in the flow resulting in the rise of energy losses and in the appreciable decrease of the flow velocities in the main channel as well as in the drop of the discharge capacity. The same phenomena arise in the river flow when depth variations over the flow width are smooth but the absolute roughness along the length of wetted perimeter varies sharply. The phenomenon of different hydraulic resis tance flow interactions with espect to the width causing the velocity decrease in the zone with lesser relative bottom roughness is called the free flow kinematic effect. In the paper the origin and the problem formulation as well as some results of the studies are di scussed.

DOI:

Year: 1985