Bridges are crucial components of our transportation system and pricey highway hydraulic structures. One of the risky issues in river engineering is erosion induced by the flow around the piers of these structures in alluvial streams, and the scour around bridge piers is one of the circumstances that has drawn a lot of attention. Numerous bridge collapses have happened as a result of the weakening of their foundations. In this study, we used the (HEC-RAS) program in order to simulate previous practical experiments and demonstrate the possibility of using the program to learn about scouring around bridge piers, and compared the results of the program (HEC-RAS) with the results of scouring for practical experiments. As well as studying the effect of flow velocity, diameter of piers and distances between piers on the depth of scouring. and Work on deriving a situational equation to calculate the highest scouring that occurs around the circular piers, depending on the variables affecting the depth of this scour. The depth of scouring of the bottom soil was shown to be directly and negatively impacted by increasing the diameter of the Piera, as the depth of scouring increases with the increase in the diameter of the individual Piers and also increases with the increase in runoff drainage. In addition to the practical experiments for which the simulation process was carried out, it was discovered that the depth of Scouring is directly correlated with the increase in the diameter of the individual Piers, as the Scouring around the columns increases with the increase in Pier diameter and also increases with the increase in runoff discharge. The highest value of scouring, (100) mm and the highest scour value for laboratory tests was (63)mm, the percentage of increase was (59%) using the program(HEC-RAS) and the lowest value for scour (40) mm and the lowest scour value for laboratory tests was (25) mm, and the percentage of increase was (60%) using the (HEC-RAS) program by using pier diameter of (25 and 50) mm and a discharge of (40,20) l/sec, respectively. In addition, it is noted that at the Pier with a diameter of (25) mm, the increase in discharge from (20 to 40) l/sec caused an increase by Scouring from (40 to 60) mm, i.e. the percentage of increase was (50%),and the depth of Scouring increased from (80 to 100) mm at the Pier with a diameter of (50) mm, i.e., the percentage increase was equal to (25%), We conclude that the increase in the pier diameter and the increase in flow leads to an increase in the scouring depth. ORCID NO: 0000-0001-9179-4317
Anahtar Kelimeler: Bridge pier,HEC-RAS,Scouring
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