Proceedings of the International scientific and practical conference ―Toronto Congress of Advanced Research‖ (April 20-22, 2026) / Publisher website: www.naukainfo.com. – Toronto, Canada, 2026. - 174 p.

171 Thus, the results of velocity field measurements in the near-surface layer and in the bottom region for in-situ conditions with maximum flow rate indicate that an intense transverse circulation flow exists in the stream near the jet-directing screen, the axis of which extends along the screen's surface. As visual studies have shown, the circulation flow is most clearly observed in the area of greatest depth ahead of the screen's surface. Researches conducted at lower flow velocities showed that with decreasing velocity, the circulation flow degenerates and the velocity vectors change direction more smoothly from perpendicular to the screen to parallel to it. For the maximum flow velocities at which the researches were conducted, the characteristic regions of formation of the circulation and return flows were observed more clearly. However, the ratio of the minimum and maximum velocities, both in the near-surface layer of the flow and in its bottom part, remained the same as for the results shown in Fig. 3a and Fig. 3b. Specifically, the maximum velocities of the return flow were (0.05- 0.1)U av , and the maximum velocities observed in the region of flow constriction were (0.6-0.8)U av , where U av is the average flow velocity. Conclusions. Vortex formations were visualized using dyes introduced into the flow and positively buoyant particles, while simultaneously measuring the flow's physical parameters. Characteristic features of the formation and development of near-wall flows near the flexible screen were identified. Their influence on the velocity field characteristics was determined. It was found that the velocity of contrast agent transfer decreased above the section of the dam located near the dead-end end of the flow-directing structure. Beyond the dam, the dye in the near-surface layer of the flow rushed toward the screen, and then along the screen, was transported toward the open reservoir. Near the screen, the colored liquid was transported from the near-surface layer of the flow to its bottom, and then, opposite to the flow direction, slowly moved along the channel bottom toward the dam, performing a circulatory motion.