Environmental impact of undular tidal bores in tropical rivers

Chantal Donnelly, H Chanson

Research output: Contribution to journalArticlepeer-review

25 Citations (SciVal)

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.
Original languageEnglish
Pages (from-to)481-494
JournalEnvironmental Fluid Mechanics
Volume5
Issue number5
DOIs
Publication statusPublished - 2005

Subject classification (UKÄ)

  • Water Engineering

Keywords

  • undular tidal bore
  • undular hydraulic jump
  • process
  • sediment
  • pressure
  • physical modelling
  • boundary shear stress
  • mixing
  • velocity

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