In this paper, laboratory tests were used to determine the effects of skewness and pilecap elevation on the local scour of complex bridge piers. The 1:50 scale river models represent the Beta complex bridge piers in Babylon Province and the Ali Al-Gharbi complex bridge piers in Missan Province. The model pier consists of circular columns, rectangular pile-cap, and 2×4 array of circular piles below for the Beta Bridge and 2×3 array of circular piles below for the Missan Bridge. Four different skew-angles (=0°, 30°, 45°, 60°) and pile-cap elevations corresponding to bed level are used. All experiments are conducted for twenty-four hours. Results suggest that locations of scour start, and maximum scour depth may be different, and that their relationship is dependent on pile-cap elevation and pier skew angle. Maximum equilibrium scour depth for aligned complex piers occurs when bottom of pile cap is above original bed level; for skewed complex piers, maximum equilibrium scour depth is much larger. Increase in depth of scouring is proportional to skew angle. Sensitivity of scour development to pier skew angle increases as pile-cap elevation increases, particularly when it is fully above original bed.
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