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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Secondary flow in sharp open-channel bends: experiments and modeling
Secondary flow in sharp open-channel bends: experiments and modeling
Author : KOEN BLANCKAERT(1,2), MIAO WEI(1,2), JORIS HEYMAN(3), DANXUN LI(2) & ANTON J. SCHLEISS(1)
ABSTRACT
The dependence of curvature-induced secondary flow on the curvature ratio H/R and the Froude number Fr was
systematically investigated in a series of 18 experiments in a sharply-curved laboratory flume. The investigated flow
depths were 0.9 m, 0.13 m, 0.19 m and 0.26 m, resulting in H/R values of 0.053, 0.077, 0.112 and 0.153, and the Froude
numbers were 0.1, 0.2, 0.3, 0.4 and 0.5. The normalized magnitude of the secondary flow did not increase with H/R, as
predicted by commonly used parameterizations for secondary flow, but remained quasi-constant. This confirms
observations by Blanckaert (2009), who called this phenomenon the saturation of the secondary flow. The experiments did
not reveal any dependence of the secondary flow on Fr. Predictions of the magnitude of the secondary flow with the
nonlinear model of Blanckaert and de Vriend ((2003, 2010) agreed very well with the experimental data.
File Size : 448,276 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 18/08/2015
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