Turbulence and coherent flow structures associated with bedform amalgamation: An experimental study of the ripple-dune transition

F. López, R. Fernandez, James Leonard Best

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Although the amalgamation of bedforms is central to the evolution of dunes from a rippled bedstate, relatively little is known about the fluid dynamics and changing structure of turbulence associated with bedform amalgamation. This paper presents some results on the structure of turbulence and coherent events documented in laboratory runs simulating three different stages of bedform amalgamation across the ripple-dune transition. Velocity data was gathered by a 2D LDA system on a fine spatial grid and for periods long enough to satisfy convergence of fourth-order joint moments of velocity fluctuations. Processing of the information includes the mean velocity field, classical turbulence statistics, local production, dissipation and inertial turbulent fluxes of kinetic energy, evaluation of contributions from different coherent events to the total Reynolds stresses as well as local deviations from the mean pressure caused by dynamical effects. Copyright ASCE 2004.

Original languageEnglish (US)
Title of host publicationJoint Conference on Water Resource Engineering and Water Resources Planning and Management 2000
Subtitle of host publicationBuilding Partnerships
DOIs
StatePublished - Dec 1 2004
Externally publishedYes
EventJoint Conference on Water Resource Engineering and Water Resources Planning and Management 2000 - Minneapolis, MN, United States
Duration: Jul 30 2000Aug 2 2000

Publication series

NameJoint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
Volume104

Other

OtherJoint Conference on Water Resource Engineering and Water Resources Planning and Management 2000
CountryUnited States
CityMinneapolis, MN
Period7/30/008/2/00

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Keywords

  • Bed ripples
  • Bedforms
  • Dunes
  • Fluid dynamics
  • Reynolds stress
  • Turbulence
  • Velocity

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Geography, Planning and Development

Cite this

López, F., Fernandez, R., & Best, J. L. (2004). Turbulence and coherent flow structures associated with bedform amalgamation: An experimental study of the ripple-dune transition. In Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships (Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships; Vol. 104). https://doi.org/10.1061/40517(2000)275