Abstract
A semi-empirical analysis on the time-averaged equilibrium live-bed scour at an abutment, placed perpendicular to the flow direction, is presented. The approach is based on the flow and sediment mass continuity equations, scour geometry, flow resistance, and a generalized bed-load transport relation in an alluvial channel. The proposed equation can be reduced to the equilibrium clear-water scour equation proposed earlier by the first writer (Lim). A total of 111 live-bed scour data from various sources were analyzed and compared with the developed equation. The agreement between the computed and measured data is acceptable.
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