TY  - CONF
A1  - Albayrak, I.
A1  - Auel, C.
A1  - Boes, R.M.
T1  - Supercritical flow in sediment bypass tunnels
T2  - Proc. 12th Int. Symp. on River Sedimentation. Advances in River Sediment Research
N2  - This paper deals with an experimental investigation of the mean and turbulence characteristics of supercritical quasi-uniform and gradually varied open-channel flows over a transitional rough bed. These conditions are typical for sediment bypass tunnels. The results show that the log-law holds well in the inner region across the channel. The roughness shifts the velocity profiles downward by an amount of ΔU+. The velocity-dip phenomenon and strong secondary currents exist in the channel for narrow open-channel flow. These currents cause the Reynolds shear stress distributions to deviate from the linear distribution and an undulation on the transversal distribution of the bed shear stress, which matches with the bed abrasion pattern. The streamwise turbulence intensity profiles deviate from the semi-empirical universal function whereas the vertical turbulence intensity profiles fit well with it only at the centerline of the channel. A strong wall effect exists on the turbulence intensities in the outer region.
Y1  - 2013
UR  - https://www.hb.fh-muenster.de/opus4/frontdoor/index/index/docId/15159
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:836-opus-151597
SN  - 978-1-138-00062-9
SP  - 1867
EP  - 1875
PB  - Taylor and Francis
CY  - London, UK
ER  -