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Ski jump – flow choking (6)

Ski jump - flow choking (6)


This photo shows a ski jump investigation with circular-shaped flip buckets in a hydraulic model at VAW. Flow choking occurs if the approach flow Froude number is below a certain threshold and a hydraulic jump develops on the flip bucket. Here the flip bucket radius is 0.40 m and the deflection angle 40°. The approach water depth is 0.05 m and the choking Froude number 2.9. The jet impinges close to the takeoff section and may develop a scour hole undermining its foundation.




Laboratory of Hydraulics, Hydrology and Glaciology (VAW), Swiss Federal Institute of Technology Zurich, Switzerland


Heller, V., Hager, W.H., Minor, H.-E. (2004). Skisprung – Allgemeine Bemessungsansätze. Wasser Energie Luft (7/8): 183-187 (in German). Heller, V., Hager, W.H., Minor, H.-E. (2005). Ski jump hydraulics. Journal of Hydraulic Engineering 131(5): 347-354. Heller, V., Hager, W.H., Minor, H.-E. (2007). Hydraulics of ski jumps. Proc. 32nd Congress of IAHR, Venice, Paper 377: 1-10, IAHR, New York.

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