Experimental study of depth-discharge equations and velocity patterns on vertical slot fishways
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TítuloExperimental study of depth-discharge equations and velocity patterns on vertical slot fishways
Proceedings of the IAHR Congress, August 24-29, 2003, Thessaloniki, Greece, edited by J. Ganoullis and P. Prinos, p. 433-439
Fishways are hydraulic structures that enable fish to go through transverse obstructions to continue their upstream migrations. This paper presents the results of a scale model of a vertical slot fishway. For two different slopes, the performance of two particular designs of vertical slot fishways was studied for a wide range of discharges. Water depths were measured in the almost all the surface of pools. A linear relation between dimensionless discharge and depth of flow, and the same flow patterns for each design were found. With an acoustic Doppler velocimeter (ADV), three-dimensional velocities were measured at several levels in the entire pool to appreciate the structure of the flow. Two different regions in flow patterns were found: a direct flow region characterized for maximum velocities; and a recirculation region, defined by small velocities and horizontal eddies.