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Bridge Contraction and Lateral Spillslope Scour.
| 题名： | Bridge Contraction and Lateral Spillslope Scour. |
| 作者： | molinas, a. bailey, w. |
| 关键词： | hydraulic modeling, discharge, downstream flows, erosion, channels, elevation, surface properties, sediments, design analysis |
| 摘要： | This research investigated: Effects and zone of influence of choked flows; Lateral erosion of bridge spillslopes; Bedrock interdiction by scour; and Scour downstream from choked-flow conditions. The present study has two goals: (1) Definition of scour zone downstream from choked flow; and (2) Computation of lateral spillslope erosion through the stream power theory. In order to accomplish these objectives, the following tasks were delineated and carried out. (1) Theoretical analysis to develop stream power relationships for severely contracted channel segments through bridges; (2) Field survey; (3) Hydraulic modeling of choked flows; and (4) Sediment modeling to determine scour. Stream power analysis enhanced the accuracy of BRI-STARS computations for the computation of spillslope scour through bridge openings. Computed bed elevation and water surface profiles through Murphy Creek showed the transition of subcritical upstream flows to supercritical downstream flows between the northbound and southbound bridges and matched the trend and magnitude of observed channel widening and erosion patterns very closely. This powerful approach, combined with angle of repose failure and implementation of bedrock controls provides engineers a very important design tool. / NOTE: Final rept. (Feb 04-Nov 06). / Supplementary Notes: Sponsored by Wyoming Dept. of Transportation, Cheyenne. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0717；80p |
| 报告类型： | 科技报告 |
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