Akademik Veri Yönetim Sistemi
Journal of Disaster and Risk, cilt.8, sa.1, ss.148-165, 2025 (Scopus)
Within the scope of the study, scour hole around the pier of a skewed bridge model was investigated under clear water and pressurized flow conditions. In the experiments, pressure bridge scour was examined at three different discharges and four approach flow depths using a bridge deck with a 15° skewness angle and an oval pier. The experiments were conducted in three groups as vertical contraction scour under pressure flow condition, local scour under free flow condition and pressure bridge scour under pressurized flow condition. It was observed that the maximum vertical contraction scour depth increased as discharge increased and decreased with increase in approach flow depth in the presence of only bridge deck. It was also noted that the maximum local scour depth increased with discharge and approach flow depth under free flow condition. Similar results were monitored under pressurized flow condition for bridge scour in which the maximum scour depth increased with increasing discharge and decreasing approach flow depths. Furthermore, it was noted that the upstream thalweg lowered and the scour hole became wider at small approach flow depths under pressurized flow condition. This showed that the observed vortices and turbulence were effective not only around the pier but also on the upstream of the deck. According to the results, it was shown that the maximum pressure flow scour depth was greater than the sum of the vertical contraction and local scour depths at small discharges, but as discharge increased, the maximum pressure flow scour depth decreased.