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This article analyzes theoretical and experimental research on the open streams confluence. The structure of the confluence zone of the streams has been studied using experimental data. The way to determine the trajectory and direction of internal flows based on isotach field has been given. The mathematical twodimensional model of open streams transfer in the influence zone of bridges with group openings, which include the effect of internal flows on hydrodynamic flow characteristics, has been presented. As a closing turbulence model there have been used the algebraic relations for Reynolds stresses together with twoparameter k e model for the depthaveraged values which has been modified to allow effects of the flow curvature. An experimental research of the node of open flows confluence has been used to confirm the adequacy of the developed model. The influence of secondary currents of transverse circulation, including eddy zones, on the distribution of turbulent stresses has been studied. Experimental data have been compared with the results of numerical simulation obtained from specially developed software.

Research of Internal Currents in the Node of Branching River Flows