This study focuses on scour depth development around 45
wing-wall setback abutments
in a compound channel. The results show that the scour development curves
almost have similar shape and they can be described using exponential function. It is
generally observed that the scour hole achieved 80% of the equilibrium scour depth
at a scour time equals to 25% of the equilibrium scour time. Additionally, an increase
in the relative abutment length and the contraction ratio causes an increase in the
equilibrium time. However, this time decrease with increasing flow depth ratio.
Finally, new empirical equations are proposed to predict the development of scour
depth and the time to reach the equilibrium state. These equations will be useful to
predict these characteristics of scour hole especially for setback abutments in
compound channel and predict the temporal development scour depth for previous
studies that have available data related to maximum scour depth.