Reduction of bend scour by an outer bank footing: Flow field and turbulence

Reduction of bend scour by an outer bank footing: Flow field and turbulence.
Roca, M.and Blanckaert, K. and Martín-Vide, J.P.
Journal of Hydraulic Engineering ASCE, 135 (5). pp. 361-368. (2009)

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Abstract:River bank protection is a costly but essential component in river management. Outer banks in river bends are most vulnerable to scour and erosion. Previous laboratory experiments illustrated that a well-designed horizontal foundation of a vertical outer bank protruding into the cross section, called a footing, can reduce the scour depth and thereby protect the bank. This paper provides detailed experimental data in a reference experiment without footing and an experiment with footing carried out under similar hydraulic conditions, which suggest a delicate interaction between bed topography, downstream and cross-stream velocity, and to lesser extent turbulence. The presence of the outer bank footing modifies this delicate interaction and results in a more favorable configuration with respect to bank stability including: reduced maximum scour depth, more uniformly distributed downstream velocity, and weaker cross-stream circulation cells.
Item Type:Article
Subjects:Floods > River management
Floods > General
Coasts > Sediment transport and scour
Water > General
ID Code:349
Deposited On:16 Sep 2009 11:01
Last Modified:11 Aug 2014 07:27

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