| Abstract: | Streambed scour at bridge piers is among the leading causes of bridge failure in the United States. Several pier-scour equations have been developed to calculate potential scour depths at existing and proposed bridges. Because many pier-scour equations are based on data from laboratory flumes and from cohesionless silt- and sand-bottomed streams, they tend to overestimate scour for piers in coarse-bed materials. Several equations have been developed to incorporate the mitigating effects of large particle sizes on pier scour, but further investigations are needed to evaluate how accurately pier-scour depths calculated by these equations match measured field data.
This report, prepared in cooperation with the Montana Department of Transportation, describes the evaluation of five pier-scour equations for coarse-bed streams. Pier-scour and associated bridge-geometry, bed-material, and streamflow-measurement data at bridges over coarse-bed streams in Montana, Alaska, Maryland, Ohio, and Virginia were selected from the Bridge Scour Data Management System. Pier scour calculated using the Simplified Chinese equation, the Froehlich equation, the Froehlich design equation, the HEC-18/Jones equation and the HEC-18/Mueller equation for flood events with approximate recurrence intervals of less than 2 to 100 years were compared to 42 pier-scour measurements. Comparison of results showed that pier-scour depths calculated with the HEC-18/Mueller equation were seldom smaller than measured pier-scour depths. In addition, pier-scour depths calculated using the HEC-18/Mueller equation were closer to measured scour than for the other equations that did not underestimate pier scour. However, more data are needed from coarse-bed streams and from less frequent flood events to further evaluate pier-scour equations. |
| Genre: | USGS Numbered Series |
| ProdID: | 69921 |
| Citation Author: | Chase, Katherine J.; Holnbeck, Stephen R. |
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| Citation Language: | ENGLISH |
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| Citation LatN: | 0715088 |
| Citation LatS: | 0249052 |
| Citation LonE: | -0665783 |
| Citation LonW: | -1684923 |
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| Citation Phsyical Description: | 24 p. |
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| Citation Series: | Scientific Investigations Report |
| Citation Series Code: | SIR |
| Citation Series Number: | 2004-5111 |
| Citation Search Results Text: | Evaluation of pier-scour equations for coarse-bed streams; 2004; SIR; 2004-5111; Chase, Katherine J.; Holnbeck, Stephen R. |
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| Citation Year: | 2004 |
| Type: | citation/reference |
| Text: | Evaluation of pier-scour equations for coarse-bed streams; 2004; SIR; 2004-5111; Chase, Katherine J.; Holnbeck, Stephen R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.water.usgs.gov/sir2004-5111/ |
| Date Other: | Sat, 15 Jan 2005 00:00 -0600 |
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