2024 Volume 80 Issue 16 Article ID: 23-16106
When dams and weirs are constructed in rivers, it becomes more difficult for fish to travel upstream, so constrictive fishways are needed. In order for fish to travel up the fishway, they must be attracted to the entrance of the fishway and pass through it quickly without staying in the fishway or escaping. Typically, fish avoid bubbles. In this study, this property was used to increase fish passage rates.The position of generated bubbles on the pool bottom was changed and also the amount of bubbles were changed between 0 to 10 × 10-3 m3/(m2s). It was found that the best bubble position is diagonally opposite one of dropping flow and also that this effectiveness is increased with an increase of the bubble volume.
