Flume Experiment Investigation on Propagation Characteristics of Tidal Bore in A Curved Channel

Tidal bore is a special and intensive form of flow movement induced by tidal effect in estuary areas, which has complex characteristics of profile, propagation and flow velocity. Although it has been widely studied for the generation mechanism, propagation features and influencing factors, the curve...

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Bibliographic Details
Published in:China ocean engineering 2023-02, Vol.37 (1), p.131-144
Main Authors: Fan, Jun, Tao, Ai-feng, Shi, Mo-quan, Li, Ying, Peng, Ji
Format: Article
Language:English
Subjects:
Beach erosion
Breakwaters
Coastal Sciences
Curvature
Design engineering
Engineering
Estuaries
Estuarine dynamics
Flow velocity
Fluid- and Aerodynamics
Flumes
Free surfaces
Marine & Freshwater Sciences
Numerical and Computational Physics
Oceanography
Offshore Engineering
Original Paper
Propagation
Propagation velocity
Siltation
Simulation
Spatial distribution
Straight channels
Tidal bores
Tidal effects
Velocity
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Summary:Tidal bore is a special and intensive form of flow movement induced by tidal effect in estuary areas, which has complex characteristics of profile, propagation and flow velocity. Although it has been widely studied for the generation mechanism, propagation features and influencing factors, the curved channel will complicate the characteristics of tidal bore propagation, which need further investigation compared with straight channel. In this study, the flume experiments for both undular and breaking bores’ propagation in curved channel are performed to measure the free-surface elevation and flow velocity by ultrasonic sensors and ADV respectively. The propagation characteristics, including tidal bore height, cross-section surface gradient, tidal bore propagation celerity, and flow velocity are obtained for both sides of the curved channel. And three bore intensities are set for each type of tidal bores. The free-surface gradients are consistently enlarged in high-curvature section for undular and breaking bores, but have distinct behaviors in low-curvature section. The spatial distributions of tidal bore propagation celerity and flow velocity are compared between concave and convex banks. This work will provide experimental reference for engineering design of beach and seawall protection, erosion reduction and siltation promotion in estuary areas with the existence of tidal bores.
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-023-0011-9