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Physical Modeling of Abutment Scour for Overtopping, Submerged Orifice, and Free Surface Flows
Recent flooding in the Atlanta metro area in Georgia, USA in September 2009 resulted in extensive damage to numerous bridges due to overtopping which caused abutment scour and failure of the approach embankment in some instances. At several locations, the 500-year flood level was exceeded. A laboratory study was conducted to compare characteristics of abutment scour for free-surface flow, submerged orifice flow and overtopping flow cases. Detailed bed scour contours under and downstream of the bridge as well as velocity distributions were measured for a model bridge with a set-back abutment in the floodplain of a compound channel. The channel bathymetry and bridge geometry were based on a typical bridge in the Piedmont region of Georgia. The embankment was constructed of an erodible core covered with rock riprap protection. Results showed that maximum abutment scour is a combination of local turbulence and flow contraction effects and has different magnitudes depending on the flow types (free-surface, submerged orifice, and overtopping) that produce unique flow fields through the bridge in the vicinity of the abutment.
Physical Modeling of Abutment Scour for Overtopping, Submerged Orifice, and Free Surface Flows
Recent flooding in the Atlanta metro area in Georgia, USA in September 2009 resulted in extensive damage to numerous bridges due to overtopping which caused abutment scour and failure of the approach embankment in some instances. At several locations, the 500-year flood level was exceeded. A laboratory study was conducted to compare characteristics of abutment scour for free-surface flow, submerged orifice flow and overtopping flow cases. Detailed bed scour contours under and downstream of the bridge as well as velocity distributions were measured for a model bridge with a set-back abutment in the floodplain of a compound channel. The channel bathymetry and bridge geometry were based on a typical bridge in the Piedmont region of Georgia. The embankment was constructed of an erodible core covered with rock riprap protection. Results showed that maximum abutment scour is a combination of local turbulence and flow contraction effects and has different magnitudes depending on the flow types (free-surface, submerged orifice, and overtopping) that produce unique flow fields through the bridge in the vicinity of the abutment.
Physical Modeling of Abutment Scour for Overtopping, Submerged Orifice, and Free Surface Flows
Hong, Seung Ho (author) / Sturm, T. W. (author)
International Conference on Scour and Erosion (ICSE-5) 2010 ; 2010 ; San Francisco, California, United States
Scour and Erosion ; 590-598
2010-10-29
Conference paper
Electronic Resource
English
Physical Modeling of Abutment Scour for Overtopping, Submerged Orifice, and Free Surface Flows
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