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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Turbulent advances of breaking bores: physical modelling in a large facility
Turbulent advances of breaking bores: physical modelling in a large facility
Author : XINQIAN LENG(1), & HUBERT CHANSON(2)
ABSTRACT
In an estuarine system, the flood tidal wave may become a tidal bore during the early flood tide in a narrow funnelled
channel under large tidal ranges. Herein new experiments were conducted in a large flume to investigate breaking tidal
bores and the bore roller propagation. The results demonstrated several key features of tidal bores propagating in
rectangular channels. The propagation of the breaking bore roller was a highly turbulent process. The celerity of the
roller toe fluctuated rapidly with both longitudinal and transverse distances. The instantaneous longitudinal free-surface
profile of the roller showed significant temporal and spatial fluctuations. The free-surface fluctuations were maximum
shortly after the toe passage. The unsteady velocity measurements indicated large and rapid fluctuations of all velocity
components during the bore passage. The velocity fluctuations yielded very significant Reynolds stress amplitudes and
fluctuations. Instantaneous stress magnitudes in excess of 90 Pa were observed in laboratory, having the potential to
scour large non-cohesive materials.
File Size : 12,463,208 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 19/08/2015
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