Proceedings of the International scientific and practical conference ―Education and Scientific Progress‖ (April 24-26, 2026) / Publisher website: www.naukainfo.com. – Manchester, United Kingdom, 2026. - 218 p.

139 jet significantly degenerated and began to merge into a vortex structure, which has a longitudinal scale of about x=0.25H and a transverse scale (along the y axis) of the order of 0.35H. At a distance of about x=0.5H another large-scale vortex structure is observed (x=(0.25-0.35)H and y=(0.35-0.4)H). Further downstream, another, but less pronounced structure was observed, which has an even larger scale of about (x=(0.5- 0.6)H and y=(0.75-0.9)H) and gradually degenerated into a shapeless colored cloud that expanded in three mutually perpendicular coordinates, approaching both the water surface and the bottom of the channel (see, Fig. 2a). The jet of black dye, going around the model of the seamount, behind it also began to oscillate and at a distance of about x=1.5H formed into a vortex structure of a smaller scale than in the conditions of the movement of red dyes. At a distance of about x=2H, the black dyes gathered into a sufficiently large-scale structure (x=(0.5- 0.6)H and z=(0.6-0.75)H) and gradually degenerated with movement downstream. The green dye jet had a shorter path of distinct motion and gradually merged with the red dye motion. This behavior of the green dye motion, from our point of view, is due to the flow motion in the gorge between the Atlantis II seamount model and its smaller neighbors, which are located at a distance y=(1-1.5)H from the top of the Atlantis II seamount. The results of visual researches with the deepening of the color dye supply system to a depth of -0.2H relative to the top of the Atlantis II seamount model are presented in Fig. 3. The red dye was supplied along the center of the mountain ridge at a level of 0.04 m below the mountain peak, or z=-0.2H and at a distance of 0.01 m from the mountain, x=-0.05H, the green dye was supplied at the edge of the mountain ridge at a distance of 0.055 m from the center of the mountain closer to the gorge between the mountains (ridge edge y=0.28H), the black dye was supplied from the opposite edge of the mountain at a distance y=-0.28H. The results of visual researches (Fig. 3a) showed that in front of the top of the Atlantis II seamount model, the colored dye began to rise in front of the surface of the mountain. Thus, the red dye, which moved to the top of the mountain, moved above the top of the mountain at an angle of almost 30 degrees towards the free surface, and