Double-Averaging Concept for Rough-Bed Open-Channel and Overland Flows

Applications

Vladimir Ivanovich Nikora, Stephen McLean, Stephen Coleman, Dubravka Pokrajac, Ian Kenneth McEwan, Lorna Jane Campbell, Jochen Aberle, Dougal Clunie, Katinka Koll

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

The paper briefly outlines the double-averaging methodology for studying environmental rough-bed flows. It focuses on the applications of this methodology in environmental hydraulics by providing several examples illustrating advantages of this methodology over conventional approaches. Examples include: (1) identification of specific flow layers and flow types; (2) vertical distribution of the double-averaged velocity between the roughness tops and troughs; (3) vertical distribution of momentum fluxes and sinks for typica roughness types due to turbulence, mean flow heterogeneity, secondary currents, form drag, and viscous drag; (4) estimates of form-induced (dispersive) stresses and evaluation of their structure using quadrant analysis; and (5) closure development for mass-transfer-uptake processes for stream periphyton. These examples illustrate the advantages of the double-averaging methodology over conventiona approaches as well as highlight its potential for studying flows over very rough beds, highly mobile beds, permeable beds, and surface-subsurface exchanges of mass, heat, and momentum. This methodology may also significantly improve research tools for studying a wide range of flow-biota interaction phenomena such as those related to aquatic plants, mussel communities, biofilms, and many others.

Original languageEnglish
Pages (from-to)884-895
Number of pages12
JournalJournal of Hydraulic Engineering
Volume133
Issue number8
DOIs
Publication statusPublished - Aug 2007

Keywords

  • turbulence structure
  • velocity distribution
  • sediment transport
  • stream periphyton
  • plant canopies
  • vegetation
  • model
  • layer
  • forms

Cite this

Double-Averaging Concept for Rough-Bed Open-Channel and Overland Flows : Applications. / Nikora, Vladimir Ivanovich; McLean, Stephen; Coleman, Stephen; Pokrajac, Dubravka; McEwan, Ian Kenneth; Campbell, Lorna Jane; Aberle, Jochen; Clunie, Dougal; Koll, Katinka.

In: Journal of Hydraulic Engineering, Vol. 133, No. 8, 08.2007, p. 884-895.

Research output: Contribution to journalArticle

Nikora, Vladimir Ivanovich ; McLean, Stephen ; Coleman, Stephen ; Pokrajac, Dubravka ; McEwan, Ian Kenneth ; Campbell, Lorna Jane ; Aberle, Jochen ; Clunie, Dougal ; Koll, Katinka. / Double-Averaging Concept for Rough-Bed Open-Channel and Overland Flows : Applications. In: Journal of Hydraulic Engineering. 2007 ; Vol. 133, No. 8. pp. 884-895.
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