Start Date
6-28-2016 1:30 PM
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Oertel, M., Bung, D. (2016). Scouring Processes Downstream a Crossbar Block Ramp. In B. Crookston & B. Tullis (Eds.), Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures, Portland, OR, 27-30 June (pp. 566-576). doi:10.15142/T3340628160853 (ISBN 978-1-884575-75-4).
Abstract
Crossbar block ramps are hydraulic structures to conquer large river bottom steps via several pool-step-systems. Due to reduced velocities and increased flow depths, fish climb capability can be given. Several authors investigated crossbar block ramp variations to determine flow resistance, energy dissipation and bed stability features on the structure. But also the downstream end of the structure must be taken into account concerning scouring processes to guarantee the structure’s stability and to reduce damage during flood events. The present paper presents a comprehensive experimental investigation program dealing with scouring processes downstream a crossbar block ramp. Influences by ramp slope, discharge and the structure’s geometry are tested. Particularly, for larger discharges and steep slopes massive scouring takes place. With increasing tailwater depth scouring is reduced and hence the structure’s stability is less affected.
Included in
Scouring Processes Downstream a Crossbar Block Ramp
Portland, OR
Crossbar block ramps are hydraulic structures to conquer large river bottom steps via several pool-step-systems. Due to reduced velocities and increased flow depths, fish climb capability can be given. Several authors investigated crossbar block ramp variations to determine flow resistance, energy dissipation and bed stability features on the structure. But also the downstream end of the structure must be taken into account concerning scouring processes to guarantee the structure’s stability and to reduce damage during flood events. The present paper presents a comprehensive experimental investigation program dealing with scouring processes downstream a crossbar block ramp. Influences by ramp slope, discharge and the structure’s geometry are tested. Particularly, for larger discharges and steep slopes massive scouring takes place. With increasing tailwater depth scouring is reduced and hence the structure’s stability is less affected.