Scour is a primary cause of bridge failures worldwide, posing significant risks to infrastructure stability and safety. Understanding the mechanisms of scouring is crucial for developing effective mitigation strategies. This study employs FLOW-3D software to create a detailed three-dimensional model of local scour around a bridge pier, providing an advanced simulation framework. The model is meticulously calibrated using experimental data obtained from tests conducted on a circular pier, ensuring high accuracy and reliability in the simulation results.

The primary objective of this research is to assess the efficacy of circular collars as countermeasures in reducing scour depth around bridge piers. Circular collars are designed to deflect the flow of water and disrupt the vortices that contribute to sediment erosion at the pier base. By incorporating these countermeasures into the model, we aim to quantify their impact on reducing local scour.

The simulation results reveal that the addition of circular collars significantly diminishes local scour around the pier. The collars effectively alter the flow patterns, reducing the intensity of vortices and the resulting sediment displacement. This study provides valuable insights into the practical application of FLOW-3D in hydraulic engineering and underscores the potential of circular collars as a cost-effective solution for mitigating scour-related bridge failures.