Turbulence over cube-mounted rough bed using spatiotemporal averaging approach

Santosh Kumar Singh, Koustuv Debnath*, Bijoy S. Mazumder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The paper describes an experimental study carried out in a laboratory flume to investigate the turbulent characteristics of cube mounted rough bed (3D flow). The three-dimensional (3D) velocity data are analyzed within the framework of double time-space averaging approach. The study particularly focuses on the changes induced in the mean velocities, turbulent intensities, Reynolds shear stresses, and form-induced normal and shear stress profiles both in time and space domains. The mean velocity profile shows two distinct distributions: linear distribution below the roughness crest and logarithmic distribution above the roughness crest. Within the roughness layer near the bottom, the form-induced stress changes significantly with roughness spacing. To highlight the stress terms and associated turbulent events, the quadrant analysis is performed using form-induced velocity fluctuations. Further, the turbulent kinetic energy budget is also analyzed to examine the bursting events comprehensively.

Original languageEnglish
Pages (from-to)504-517
Number of pages14
JournalCanadian Journal of Civil Engineering
Issue number7
StatePublished - 2017
Externally publishedYes


  • Acoustic doppler velocimeter (ADV)
  • Bed-roughness
  • Double-averaged
  • Open-channel flow
  • Turbulence


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