Prediction Procedures for Maximum Total Scour Depth due to a Flood at Bridges

Recent bridge failures in all over the world due to local scour around piers and abutments have prompted a heightened interest in scour prediction methods and scour protection measures Therefore. in this paper, the prediction procedures for maximum total scour depth due to a flood at existing bridges are provided based on the procedures presented in HEC-18 published by U.S. Federal Highway Administration. This paper compares the hydraulic analyses of the Youngdong Grand Bridge over the Han River using one-dimensional models. WSPRO and HEC-2. and the two-dimensional model. TABS-MD. A comparison of bridge scour estimates for this research based on results from both one-dimensional and two-dimensional model is also presented. The two-dimensional results are shown to improve estimates of scour for complex flow situations and multiple bridge openings. The procedures developed by this research can be usefully referenced as a guide to estimate the scour at a bridge section, and it also can be referenced for the design of new bridges.