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

Fingerprint

flow structure
ripple
bedform
Flow structure
dune
Turbulence
experimental study
turbulence
event
fluctuation
statistics
fluid dynamics
Fluid dynamics
energy
Kinetic energy
kinetic energy
dissipation
evaluation
Statistics
Fluxes

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

Turbulence and coherent flow structures associated with bedform amalgamation : An experimental study of the ripple-dune transition. / López, F.; Fernandez, R.; Best, James Leonard.

Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships. 2004. (Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships; Vol. 104).

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

López, F, Fernandez, R & Best, JL 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, Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000, Minneapolis, MN, United States, 7/30/00. https://doi.org/10.1061/40517(2000)275
López F, Fernandez R, Best JL. 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. 2004. (Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships). https://doi.org/10.1061/40517(2000)275
López, F. ; Fernandez, R. ; Best, James Leonard. / Turbulence and coherent flow structures associated with bedform amalgamation : An experimental study of the ripple-dune transition. Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships. 2004. (Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships).
@inproceedings{07791b21e6f44e97befbc797cd61e129,
title = "Turbulence and coherent flow structures associated with bedform amalgamation: An experimental study of the ripple-dune transition",
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.",
keywords = "Bed ripples, Bedforms, Dunes, Fluid dynamics, Reynolds stress, Turbulence, Velocity",
author = "F. L{\'o}pez and R. Fernandez and Best, {James Leonard}",
year = "2004",
month = "12",
day = "1",
doi = "10.1061/40517(2000)275",
language = "English (US)",
isbn = "0784405174",
series = "Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships",
booktitle = "Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000",

}

TY - GEN

T1 - Turbulence and coherent flow structures associated with bedform amalgamation

T2 - An experimental study of the ripple-dune transition

AU - López, F.

AU - Fernandez, R.

AU - Best, James Leonard

PY - 2004/12/1

Y1 - 2004/12/1

N2 - 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.

AB - 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.

KW - Bed ripples

KW - Bedforms

KW - Dunes

KW - Fluid dynamics

KW - Reynolds stress

KW - Turbulence

KW - Velocity

UR - http://www.scopus.com/inward/record.url?scp=74949125545&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=74949125545&partnerID=8YFLogxK

U2 - 10.1061/40517(2000)275

DO - 10.1061/40517(2000)275

M3 - Conference contribution

AN - SCOPUS:74949125545

SN - 0784405174

SN - 9780784405178

T3 - Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships

BT - Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000

ER -