Backwater Calculation Methods for Long-Roadbed Cross-River Bridges
SANG Linhao
HE Yong
WANG Haiyang
Abstract：Focusing on the backwater calculation for cross-river bridges with long roadbeds within the river channel,the Jingha Expressway bridge over the Chaobai River was taken as an example in this study.The different methods—including 2D and 1D mathematical models and common empirical formulas—were employed to calculate the backwater and the applicability of each method for long-roadbed bridges was analyzed.The results indicated that the 2D and 1D models could accurately simulate the river section morphology and bridge layout,yielding relatively precise results.Among the empirical formulas,the result from the"Hydraulic Calculation Manual"formula was the closest to the model results,though slightly smaller.The results from the"Code for Hydrological Survey and Design of Railway Engineering"formula,the Lu Hao formula,and the Li Fujun formula were all comparatively small and do not fully reflect the backwater impact.The result from the Henderson formula far exceeded the mathematical model results.This research provides a basis and reference for the calculation and verification methods of backwater for long-roadbed cross-river bridges.
Keywords：bridge backwater calculationlong-roadbed bridgemathematical modelempirical formula
Publication Date：2025-11-20
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：4( 95-98 )