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Article
Derivation and Application of the Energy Dissapation Factor in the Design of Fishways
Ecological Engineering (2015)
  • Brett Towler, University of Massachusetts Amherst
  • Kevin Mulligan
  • Alex Haro
Abstract

Reducing turbulence and associated air entrainment is generally considered advantageous in the engineering design of fish passage facilities. The well-known energy dissipation factor, or EDF, correlates with observations of the phenomena. However, inconsistencies in EDF forms exist and the bases for volumetric energy dissipation rate criteria are often misunderstood. A comprehensive survey of EDF criteria is presented. Clarity in the application of the EDF and resolutions to these inconsistencies are provided through formal derivations; it is demonstrated that kinetic energy represents only 1/3 of the total energy input for the special case of a broad-crested weir. Specific errors in published design manuals are identified and resolved. New, fundamentally sound, design equations for culvert outlet pools and standard Denil Fishway resting pools are developed. The findings underscore the utility of EDF equations, demonstrate the transferability of volumetric energy dissipation rates, and provide a foundation for future refinement of component-, species-, and life-stage-specific EDF criteria.

Keywords
  • Fishway,
  • Fish passage,
  • Fish ladder,
  • EDF,
  • Energy dissipation,
  • Turbulence
Publication Date
October, 2015
Publisher Statement
B. Towler, K. Mulligan, A. Haro, Derivation and application of the energy dissipation factor in the design of fishways, Ecological Engineering, Volume 83, October 2015, Pages 208-217, ISSN 0925-8574, http://dx.doi.org/10.1016/j.ecoleng.2015.06.014. (http://www.sciencedirect.com/science/article/pii/S0925857415300744) Keywords: Fishway; Fish passage; Fish ladder; EDF; Energy dissipation; Turbulence
Citation Information
Brett Towler, Kevin Mulligan and Alex Haro. "Derivation and Application of the Energy Dissapation Factor in the Design of Fishways" Ecological Engineering Vol. 83 (2015)
Available at: http://works.bepress.com/brett_towler/5/