Author(s): T. W. Sturm; A. Chrisochoides
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Keywords: No Keywords
Abstract: Clear-water scour at a bridge abutment located on the floodplain of a compound open channel is influenced by the flow distribution between floodplain and main channel in the approach and contracted bridge cross-sections. It has been suggested that the effect of the flow contraction can be accounted for by a discharge contraction ratio that depends on abutment length as well as the discharge distribution in the approach section of a compound channel (Sturm & Janjua 1994). In addition, previous equations for predicting clear-water scour depths at abutments have depended on the ratio of floodplain velocity V1 to critical velocity V。 in the bridge approach section (Melville 1992, Sturm & Janjua 1994) with maximum clear-water scour occurring when V1 approaches Vc. In this formulation, the independent variables for scour prediction are determined from one-dimensional numerical models.
Year: 1997