Impact of a large cylindrical roughness on tidal bore propagation

Yeow, Swee Chia, Chanson, Hubert and Wang, Hang (2016) Impact of a large cylindrical roughness on tidal bore propagation. Canadian Journal of Civil Engineering, 43 8: 724-734. doi:10.1139/cjce-2015-0557

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Author Yeow, Swee Chia
Chanson, Hubert
Wang, Hang
Title Impact of a large cylindrical roughness on tidal bore propagation
Journal name Canadian Journal of Civil Engineering   Check publisher's open access policy
ISSN 0315-1468
Publication date 2016-08-01
Year available 2016
Sub-type Article (original research)
DOI 10.1139/cjce-2015-0557
Open Access Status Not Open Access
Volume 43
Issue 8
Start page 724
End page 734
Total pages 11
Place of publication Ottawa, ON Canada
Publisher NRC Research Press
Collection year 2017
Language eng
Abstract A tidal bore is a hydrodynamic shock, surging upstream in some shallow-water bays and estuaries during the flood tide under large tidal range. This study investigates experimentally the propagation of tidal bores over a large cylindrical roughness element, representative of damaged bridge pier foundation. In the initially steady flow, the large cylindrical element generated a wake region, with extents comparable to steady flow literature. During the tidal bore propagation, the presence of the element had negligible effect on the free-surface properties, but a significant impact in terms of the instantaneous velocity and Reynolds stresses. This resulted in longer transient recirculation both upstream and downstream of the element and larger maximum velocity recirculation magnitudes, as well as enhanced turbulent stress levels and potential bed erosion around the large element, within two diameters from the element centre. The results showed the potential development of a large scour hole around the cylindrical element.
Keyword Tidal bores
Large roughness element
Physical modelling
Unsteady turbulent mixing
Compression waves
Turbulent Reynolds stresses
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes The deposit is a preprint of: YEOW, S.C., CHANSON, H., and WANG, H. (2016). "Impact of a large cylindrical roughness on tidal bore propagation." Canadian Journal of Civil Engineering, Vol. 43, No. 8, pp. 724-734 (DOI: 10.1139/cjce-2015-0557) (ISSN 0315-1468).

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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Created: Fri, 05 Aug 2016, 20:01:44 EST by Hubert Chanson on behalf of School of Civil Engineering