Upstream propagation of surges and bores: free-surface observations

Leng, Xinqian and Chanson, Hubert (2017) Upstream propagation of surges and bores: free-surface observations. Coastal Engineering Journal, 59 2: . doi:10.1142/S0578563417500036

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Author Leng, Xinqian
Chanson, Hubert
Title Upstream propagation of surges and bores: free-surface observations
Journal name Coastal Engineering Journal   Check publisher's open access policy
ISSN 0578-5634
1793-6292
2166-4250
Publication date 2017-03-11
Year available 2017
Sub-type Article (original research)
DOI 10.1142/S0578563417500036
Open Access Status Other
Volume 59
Issue 2
Total pages 32
Place of publication Hackensack, NJ, United States
Publisher World Scientific Publishing
Collection year 2018
Language eng
Formatted abstract
In a free-surface flow, a sudden increase in water depth induces a positive surge, also called compression wave or bore. Herein a physical study was conducted in relatively large-size rectangular channel with a smooth bed. The upstream propagation of breaking and undular bores were investigated with a broad range of Froude numbers Fr1 ranging from 1.1 to 2.3. Both instantaneous and ensemble-averaged free-surface measurements were performed nonintrusively. The observations showed the occurrence of undular bores for 1<Fr1<1.21to 1.3, breaking bores for Fr1>1.4 to 1.5, and breaking bores with secondary waves for 1.2–1.3<Fr1<1.4–1.5. The propagation of a breaking bore was associated with an upward free-surface curvature immediately before the roller toe for Fr1<2, and an abrupt increase in free-surface elevation with the passage of the breaking roller. The propagation of undular bores was characterized by a smooth upward free-surface curvature, followed by a smooth first wave crest and a train of secondary quasi-periodic undulations. For all tidal bores, the passage of the bore front was always associated with large free-surface fluctuations, occurring slightly after the arrival of the front. During the generation process, the positive surge formed very rapidly and the surge celerity increased very rapidly, reaching maximum values excess of the fully-developed bore celerity. With increasing time, the surge decelerated and the bore propagated at an early constant celerity for (xgatex)/xgate>10.
Keyword Celerity
Estuaries
Free-surface measurements
Physical modeling
Positive surges
Rivers
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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