Unsteady Air Bubble Entrainment and Detrainment at a Plunging Breaker: Dominant Time Scales and Similarity of Water Level Variations

Chanson, Hubert, Aoki, Shin-ichi and Maruyama, Mamuro (2002) Unsteady Air Bubble Entrainment and Detrainment at a Plunging Breaker: Dominant Time Scales and Similarity of Water Level Variations. Coastal Engineering, 46 2: 139-157. doi:10.1016/S0378-3839(02)00069-8

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Author Chanson, Hubert
Aoki, Shin-ichi
Maruyama, Mamuro
Title Unsteady Air Bubble Entrainment and Detrainment at a Plunging Breaker: Dominant Time Scales and Similarity of Water Level Variations
Journal name Coastal Engineering   Check publisher's open access policy
ISSN 0378-3839
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1016/S0378-3839(02)00069-8
Open Access Status File (Author Post-print)
Volume 46
Issue 2
Start page 139
End page 157
Total pages 19
Editor H. F. Burcharth
Language eng
Subject 291205 Ocean Engineering
291100 Environmental Engineering
260403 Physical Oceanography
291200 Maritime Engineering
290802 Water and Sanitary Engineering
300105 Applied Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
290800 Civil Engineering
260400 Oceanography
C1
770400 Coastal and Estuarine Environment
Abstract At plunging breakers, air bubbles are entrained at the impingement of the water jet, formed at the top of the wave, with the water free surface in front. During the present study, air bubble entrainment at a pseudo-plunging breaker was investigated at near full-scale and further experimental work studied the bubble detrainment process. Experimental observations included the generation and propagation of waves downstream of the plunge point. Experimental results highlighted a number of unsteady air-water flow patterns and emphasise high levels of aeration: i.e., depth-averaged void fraction of more than 10% next to jet impact in shallow waters. Unsteady bubble injection experiments showed a strong vortical motion induced by the rising bubbles. Altogether, the results suggest that a dominant time scale is the bubble rise time d1/ur, which cannot be scaled properly with an undistorted Froude model. The study contributes to a better understanding of unsteady bubble entrainment at a pseudo-plunging breaker and the associated vortical circulation.
Keyword entrainment
detrainment
water level variations
plunging breaking wave
air entrainment
Q-Index Code C1
Additional Notes Originally published as Hubert Chanson, Shin-ichi Aoki and Mamoru Maruyama (2002) Unsteady Air Bubble Entrainment and Detrainment at a Plunging Breaker: Dominant Time Scales and Similarity of Water Level Variations, Coastal Engineering 46 (2) : 139-157. Copyright 2002 Elsevier. All rights reserved. Single copies only may be downloaded and printed for a user's personal research and study.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Civil Engineering Publications
 
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Created: Tue, 11 Oct 2005, 10:00:00 EST by Hubert Chanson on behalf of School of Engineering