Author(s): S. Kouchakzadeh; R. D. Townsend
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Keywords: No Keywords
Abstract: Most previous laboratory studies of local scour at bridge abutments were performed in rectangular channels in which the distributions of flow velocity and bed shear stress were considered uniform in the transverse direction. In reality, however, bridge abutments are usually located in the floodplain zone of rivers and frequently terminate near the floodplain-main channelj unction regions where velocity and shear stress are not uniformly distributed. This paper presents the results of a laboratory study performed to investigate the impact of lateral momentum transfer on local scour at abutments terminating in the floodplain of a compound channel. It is shown that, by accounting for lateral momentum transfer at small flodplain/main channel depth ratios (y_a/H<0.3), estimates of maximum local scour depth are increased by up to 30%.
Year: 1997