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Environmental impact of undular tidal bores in tropical rivers

Donnelly, Chantal LU and Chanson, H (2005) In Environmental Fluid Mechanics 5(5). p.481-494
Abstract
A tidal bore impacts significantly on the estuarine ecosystem, although little is known on the flow field, mixing and sediment motion beneath tidal bores. In the absence of detailed systematic field measurements, a quasi-steady flow analogy was applied to investigate undular tidal bores with inflow Froude numbers between 1.25 and 1.6. Experimental results indicated that rapid flow redistributions occur beneath the free-surface undulations, with significant variations in bed shear stress between wave crests and troughs. Dynamic similarity was used to predict detailed flow characteristics of undular tidal bores. The effects of periodic loading on river sediments, scour of river bed and flow mixing behind the bore are discussed. A better... (More)
A tidal bore impacts significantly on the estuarine ecosystem, although little is known on the flow field, mixing and sediment motion beneath tidal bores. In the absence of detailed systematic field measurements, a quasi-steady flow analogy was applied to investigate undular tidal bores with inflow Froude numbers between 1.25 and 1.6. Experimental results indicated that rapid flow redistributions occur beneath the free-surface undulations, with significant variations in bed shear stress between wave crests and troughs. Dynamic similarity was used to predict detailed flow characteristics of undular tidal bores. The effects of periodic loading on river sediments, scour of river bed and flow mixing behind the bore are discussed. A better understanding of these processes will contribute to better management practices in tidal bore affected rivers, including the Styx and Daly rivers in tropical Australia. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
undular tidal bore, undular hydraulic jump, process, sediment, pressure, physical modelling, boundary shear stress, mixing, velocity
in
Environmental Fluid Mechanics
volume
5
issue
5
pages
481 - 494
publisher
Springer
external identifiers
  • wos:000234824800004
  • scopus:31444434414
ISSN
1573-1510
DOI
10.1007/s10652-005-0711-0
language
English
LU publication?
yes
id
4529b061-7c4c-4512-b647-1cb88b91131e (old id 209763)
date added to LUP
2007-08-10 11:37:53
date last changed
2017-07-23 03:53:43
@article{4529b061-7c4c-4512-b647-1cb88b91131e,
  abstract     = {A tidal bore impacts significantly on the estuarine ecosystem, although little is known on the flow field, mixing and sediment motion beneath tidal bores. In the absence of detailed systematic field measurements, a quasi-steady flow analogy was applied to investigate undular tidal bores with inflow Froude numbers between 1.25 and 1.6. Experimental results indicated that rapid flow redistributions occur beneath the free-surface undulations, with significant variations in bed shear stress between wave crests and troughs. Dynamic similarity was used to predict detailed flow characteristics of undular tidal bores. The effects of periodic loading on river sediments, scour of river bed and flow mixing behind the bore are discussed. A better understanding of these processes will contribute to better management practices in tidal bore affected rivers, including the Styx and Daly rivers in tropical Australia.},
  author       = {Donnelly, Chantal and Chanson, H},
  issn         = {1573-1510},
  keyword      = {undular tidal bore,undular hydraulic jump,process,sediment,pressure,physical modelling,boundary shear stress,mixing,velocity},
  language     = {eng},
  number       = {5},
  pages        = {481--494},
  publisher    = {Springer},
  series       = {Environmental Fluid Mechanics},
  title        = {Environmental impact of undular tidal bores in tropical rivers},
  url          = {http://dx.doi.org/10.1007/s10652-005-0711-0},
  volume       = {5},
  year         = {2005},
}