Pressure-Flow Scour under a Bridge Deck in Clear Water Conditions

The issues of scouring around a bridge have become prominent in recent research mainly due to recurrent extreme weather events. Thus, designing with the appropriate protection measures is essential safeguard it against failure, which may take place from high flows resulting Bridges partially or entirely submerged during events such as large floods and are subject pressure-flow scour, condition where flow directed downward under deck, creating an increase velocity corresponding bed scour. This study aims explore scour depth deck without piers presence two vertical wall abutments clear water experiments. Sixty-six tests were conducted involving approach depth, material size, contraction length, width, opening for both pressure free surface conditions. An empirical equation was deduced determine maximum could be applied preliminary design bridges experimental data used performance earlier models results revealed that conditions, increased by factor between 2.15 9.81 times With same when relative length 5 7.5 10, decreased up about 7.4% 2.3%, respectively. When width 5.5 5.2 4.4, 45.6% 81.2%,