Acta Geophysica

, Volume 60, Issue 6, pp 1502–1546 | Cite as

Effects of a fully submerged boulder within a boulder array on the mean and turbulent flow fields: Implications to bedload transport

  • Athanasios N. Papanicolaou
  • Casey M. Kramer
  • Achilleas G. Tsakiris
  • Thorsten Stoesser
  • Sandeep Bomminayuni
  • Zhuo Chen
Research Article

Abstract

The objective of this coupled experimental and numerical study is to provide insight into the mean and turbulent flow fields within an array of fully submerged, isolated, immobile boulders. Our study showed that the velocity defect law performed well for describing the mean flow around the boulder within the array. A prerequisite, however, was to accurately estimate the spatial variability of u* around the boulder, which was achieved via the boundary characteristics method. The u* exhibited considerable spatial variability within the array and form roughness was shown to be up to 2 times larger than the skin roughness in the boulder near-wake region. Because the boulders bear a significant amount of the flow shear, the available bed shear stress for entrainment of the mobile sediment, τols, near the boulders was roughly 50% lower than the ambient τols. The τols variability induced by the boulders could lead to a threefold overestimation of the sediment transport rate.

Key words

boulder array velocity profile friction velocity turbulent structures large-eddy simulation (LES) 

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Copyright information

© Versita Warsaw and Springer-Verlag Wien 2012

Authors and Affiliations

  • Athanasios N. Papanicolaou
    • 1
  • Casey M. Kramer
    • 2
  • Achilleas G. Tsakiris
    • 1
  • Thorsten Stoesser
    • 3
  • Sandeep Bomminayuni
    • 3
  • Zhuo Chen
    • 3
  1. 1.IIHR-Hydroscience and EngineeringThe University of IowaIowa CityUSA
  2. 2.Washington State Department of TransportationOlympiaUSA
  3. 3.School of Civil and Environmental EngineeringGeorgia Institute of TechnologyAtlantaUSA

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