Equilibrium depth of scour at straight guide banks

3rd International Conference on Innovative Materials, Structures and Technologies

Gjunsburgs, B.^1 ; Bulankina, V.^1

Water Engineering and Technology Department, Riga Technical University, Kipsala Str. 6B, Riga

LV-1048, Latvia^1

关键词: Bridge crossing;    Computer modelling;    Depth of scours;    Eddy structures;    Local scour;    River bed;    Water surface;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/251/1/012060/pdf
DOI  :  10.1088/1757-899X/251/1/012060

来源: IOP

【 摘 要 】

The equilibrium stage of scour at the head of straight guide banks with a uniform and stratified bed conditions have been studied. The contraction of the river by bridge crossing with straight guide banks considerably alters the flow pattern. The streamlines become curve and the concentration of streamlines, longitudinal and transverse slopes of the water surface, a local increase in velocity, vortex and eddy structures, and the origin of a flow separation zone between the extreme streamlines and the guide bank are observed and local scour is developing at the head of the straight guide banks. New formulae for calculation of equilibrium depth of scour at straight guide banks at uniform and stratified river bed is elaborated and confirmed by tests and computer modelling results.