Estimation of Scour Depth at Bridge Piers by Using FASTER Model

Bridges are one of the most important river structures. One of the main causes of bridge failure is local scour at bridge piers. Yearly، Many bridges failed around the world because of disregarding hydraulic factors. Hence، an accurate prediction of scour depth at piers is essential for the safe design of the bridge foundation. In this study، local scour at Meshrageh Bridge is investigated. The Meshrageh Bridge crosses the Jarahi River near the city of Ramshir، Khusestan province. We use one dimensional equations Sain-Venant for simulation river dynamic in FASTER model. For evaluation of scour depth، 16 scour equations in subroutines were added to FASTER model. Comparison of computed scour depth showed Froehlich equation (1996) and Johnson equation (1996) appear to give a reasonable estimate of the local scour depth. Jain and Fisher equation (1979)، Melville equation (1997) and Melville and Sutherland equation (1988) overestimate scour depth.