An experimental study of velocity fields and flow patterns in aligned deep slot fishways

摘要

This paper is a study of the flow pattern taking place in a specific design of aligned deep slot fishways. The analysis is based on an experimental study in which the flow velocities and the water depths were measured in a laboratory model of the fishway. A spatial 3 dimensional mesh was used to measure the 3 velocity components. To measure the water depth a bidimensional mesh was used. Sills of different heights were placed in the slot in order to analyze its influence in the flow pattern. For each different sill, several discharges were used. As a result of the study, the relationship between the discharge and the different characteristic water depths (medium, maximum and minimum depths in the pool) as well as the discharge equations were obtained for each different sill. Three different flow patterns were observed in function of the height above the bottom of the pool. Finally, the slot velocity and the maximum velocity in the pool were analyzed.