Influence of speed distribution in a rounded flow on the character of slopes erosion

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Abstract


One of the most important issues of river hydraulics is the movement of water and the formation of a channel in a stream that has a non-straight-line outline in the plan. Under natural conditions for rivers characteristic winding shape in the plan. The curvature of the jet occurs when the flow is divided into sleeves, at the inflow into the river, the confluence of flows, etc. Therefore, the study of channel processes in rivers is impossible without knowledge of the flow patterns at the curve of the channel. When designing hydraulic structures, including bridge crossings on the meandering sections of rivers, one should know the features of the dynamics of the channel in the sections of the flow turning. In winter, such areas may be narrowed due to the freezing of the channel, and during the period of ice thawing they are clogged with ice fragments. The narrowing of the canal causes an increase in the Reynolds number and a redistribution of velocity diagrams in the area under consideration, which causes a change in the erosion pattern. In laboratory conditions, the nature of the distribution of velocities and the formation of vortices on the installation, creating a rounded flow. It is shown that, at critical Reynolds numbers, a vortex countercurrent occurs in the rounded flow at the inner shore. The impact of this velocity distribution on the erosion pattern of the various slopes of the rounded flow was analyzed.


About the authors

O. Ya. Maslikova

Water Problems Institute of Russian Academy of Sciences (IWP RAS)

Author for correspondence.
Email: gritsuk_ii@rudn.ru
3 Gubkina St., Moscow, 119333, Russian Federation

Senior Researcher of Channel Flow Dynamics and Ice Thermal Conditions Laboratory, Candidate of Technical Sciences

I. I. Gritsuk

Water Problems Institute of Russian Academy of Sciences (IWP RAS); Peoples’ Friendship University of Russia (RUDN University); Moscow Automobile and Road Construction State Technical University (MADI)

Email: gritsuk_ii@rudn.ru
3 Gubkina St., Moscow, 119333, Russian Federation; 6 Miklukho-Maklaya St., Moscow, 117198, Russian Federation; 64 Leningradsky prospect, Moscow, 125319, Russian Federation

Associate Professor of Department of Construction, Academy of Engineering; Senior Researcher, Candidate of Technical Sciences; Channel Flow Dynamics and Ice Thermal Conditions Laboratory; Associate Professor, Department of Hydraulic, Candidate of Technical Sciences

D. N. Ionov

Water Problems Institute of Russian Academy of Sciences (IWP RAS)

Email: gritsuk_ii@rudn.ru
3 Gubkina St., Moscow, 119333, Russian Federation

Senior Researcher of Channel Flow Dynamics and Ice Thermal Conditions Laboratory, Candidate of Technical Sciences

V. K. Debolskiy

Water Problems Institute of Russian Academy of Sciences (IWP RAS)

Email: gritsuk_ii@rudn.ru
3 Gubkina St., Moscow, 119333, Russian Federation

Head of Channel Flow Dynamics and Ice Thermal Conditions Laboratory, Doctor of Technical Sciences, Professor

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Copyright (c) 2019 Maslikova O.Y., Gritsuk I.I., Ionov D.N., Debolskiy V.K.

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