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- Title
Observations of Hydraulic Jumps in High-Energy Swash.
- Authors
Butt, Tony; Russell, Paul
- Abstract
The possible influence on swash-zone sediment transport of hydraulic jumps is investigated using field measurements from two natural beaches in high-energy (Hs = 1.5 to 3.7 meters) dissipative conditions. Results from measurements of cross-shore velocity using electromagnetic current meters at z = 3 centimeters, water depth using pressure transducers at z = 0, and cross-shore bore displacement using video time stacks suggest that hydraulic jumps may occur in approximately one-third of infragravity backwashes. Results from sediment load measurements using traps suggest that backwashes containing jumps can advect approximately 2.5 times as much sediment offshore than a backwash not confining a hydraulic jump. The overall effect of hydraulic jumps appears to be to enhance offshore transport, especially in high-energy conditions, when infragravity backwashes are more common.
- Subjects
HYDRAULIC jump; SEDIMENT transport; HYDRODYNAMICS; ELECTROMECHANICAL devices; HYDRAULICS; SUSPENDED sediments; HYDRAULIC engineering; ACOUSTIC velocity meters; BEACHES
- Publication
Journal of Coastal Research, 2005, Vol 21, Issue 6, p1219
- ISSN
0749-0208
- Publication type
Article
- DOI
10.2112/04-0187.1