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چکیده
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An important challenge in river engineering is the local scour around the abutments due to the contraction of cross section and strong vortices. In this paper, the laboratory experiments were conducted around wing-wall abutments of 4, 6, 8 and 10 cm long to investigate the effect of protrusion on scouring. The tests were accomplished under clear water condition with V/V_c ratios of 0.8 and 0.9.The results indicated that the increase in abutment length associated with the application of higher flow rate (V/V_c =0.9) causes the expansion in size and the volume of scour hole. Meanwhile, the contraction of flow section causes the increase in dimensionless scour depth with almost a linear trend.
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