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Estimated and Measured Bridge Scour at Selected
Sites in North Dakota, 1990-97
| 题名： | Estimated and Measured Bridge Scour at Selected Sites in North Dakota, 1990-97 |
| 作者： | Tara Williams-Sether |
| 关键词： | dakota；bridge；sites；select；measur；north；imate；ured；stim；sure |
| 摘要： | A Lev cl 2 bridge scour method u as used to estimate scour depths at 36 selected bridge sites located on the Primary road system throughout North Dakota. Of the 36 bridge sites analyzed, the North Dakota Department of Transportation rated 15 as scour critical. Flood and scour data were collected at 19 of the 36 selected bridge sites during 1990-97. Data collected were .sufficient to estimate pier .scour but not contraction or abutment scour. Estimated pier scour depths ranged from -10.6 to -1 .2 feet, and measured bed-elevation changes at piers ranges from -2.31 to +2.37 feet. Comparisons between the estimated pier .scour depths and the measured bed-elevation changes indicate that the pier .scour equations overestimate scout at bridges in North Dakota. A Level 1.5 bridge scour method also was used to estimate scour depths at 495 bridge sites located on the secondary road system throughout North Dakota. The North Dakota Department of Transportation determined that 26 of the 495 bridge sites analyzed were potentially scour critical. |
| 报告类型： | 科技报告 |
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