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

Papanicolaou, Athanasios N., Kramer, Casey M., Tsakiris, Achilleas G., Stoesser, Thorsten ORCID: https://orcid.org/0000-0001-8874-9793, Bomminayuni, Sandeep Kumar and Chen, Zhuo 2012. Effects of a fully submerged boulder within a boulder array on the mean and turbulent flow fields: Implications to bedload transport. Acta Geophysica 60 (6) , pp. 1502-1546. 10.2478/s11600-012-0044-6

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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, τ ols , near the boulders was roughly 50% lower than the ambient τ ols . The τ ols variability induced by the boulders could lead to a threefold overestimation of the sediment transport rate.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography T Technology > TA Engineering (General). Civil engineering (General)
Publisher:	Springer
ISSN:	1895-6572
Last Modified:	09 Nov 2022 08:55
URI:	https://orca.cardiff.ac.uk/id/eprint/43916

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