Table 3
Maximum equilibrium scour depth data for abutment
The maximum equilibrium scour depth values of the abutment can be compared with those of Melville (1992), Oliveto and Hager (2002), Dey and Barbhuiya (2005), and Lim (1997), as shown in Fig 12. The equations presented by Melville (1992), Oliveto and Hager (2002), Dey and Barbhuiya (2005), and Lim (1997) are for straight channels. As shown in Fig. 12, there is no close agreement between previous studies. However, there is a certain consistency between previous studies and the present study. One of the most important reasons for this is that the experiments were performed in different types of channel. In the curved channels, the flow characteristics are markedly different to those of straight channels.
Fig. 12. Comparison of maximum scour depth computed using Eqs. (1-4) with data of the present study
Conclusions
The local scours that occur around the bridge abutments on outer and inner banks in a curved channel were experimentally examined under clear-water flow conditions. Based on the findings, the conclusions are as follows.