A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Scour (the removal or redistribution of erodible material) may occur on the boundaries of unlined channels or adjacent to concrete structures in rivers. Criteria are presented for predicting the likelihood of scour in cohesionless material, and for designing loose protective linings (riprap). Application of the Shields critical shear stress criterion is described for channel beds and sloping banks. The HEC-11 procedure (a reformulation of the Shields criterion) enables the required riprap size to be related to the flow velocity. Guidelines for the protection of the material underlying riprap are also presented. The complex flow pattern around bridge piers causes intense local scouring which progresses with time and stabilizes at an equilibrium depth. Methods are presented for predicting the equilibrium scour depth and its evolution with time under clear-water and live-bed conditions. If the anticipated scour depth is unacceptable, scour can be prevented or restricted by protecting the bed around the pier base or by installing features that modify the local flow pattern to reduce its scouring action. Methods are presented for designing riprap protection, and some flow modification devices are described.
Scour (the removal or redistribution of erodible material) may occur on the boundaries of unlined channels or adjacent to concrete structures in rivers. Criteria are presented for predicting the likelihood of scour in cohesionless material, and for designing loose protective linings (riprap). Application of the Shields critical shear stress criterion is described for channel beds and sloping banks. The HEC-11 procedure (a reformulation of the Shields criterion) enables the required riprap size to be related to the flow velocity. Guidelines for the protection of the material underlying riprap are also presented. The complex flow pattern around bridge piers causes intense local scouring which progresses with time and stabilizes at an equilibrium depth. Methods are presented for predicting the equilibrium scour depth and its evolution with time under clear-water and live-bed conditions. If the anticipated scour depth is unacceptable, scour can be prevented or restricted by protecting the bed around the pier base or by installing features that modify the local flow pattern to reduce its scouring action. Methods are presented for designing riprap protection, and some flow modification devices are described.
Scour and Scour Protection
James, C S (author)
Hydraulic Structures ; Chapter: 9 ; 319-363
2019-12-20
45 pages
Article/Chapter (Book)
Electronic Resource
English
Scour , Riprap , Theoretical analysis , Incipient motion , Empirical approach , Shield diagram , Critical shear stress , Critical velocity , Permissible velocity , Intensity of motion , Movability number , Bank stability , Angle of repose , Sinuosity adjustment , Filter layers , Bridge piers , Scour depth , Scour evolution Engineering , Geoengineering, Foundations, Hydraulics , Building Construction and Design , Offshore Engineering , Mechanical Statics and Structures , Engineering Fluid Dynamics
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