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

• Autorzy: Papanicolaou A. , Kramer C. , Tsakiris A. , Stoesser T. , Bomminayuni S. , Chen Z.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

boulder array; velocity profile; friction velocity; turbulent structure; large-eddy simulation; LES

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2012
• Tom: Vol. 60, no. 6
• Strony: 1502--1546
• Opis fizyczny: Bibliogr. 68 poz.

Twórcy

autor

Papanicolaou A.

autor

Kramer C.

autor

Tsakiris A.

autor

Stoesser T.

autor

Bomminayuni S.

autor

Chen Z.

• IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, USA,

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