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Scour at Contracted Bridges.
| 题名： | Scour at Contracted Bridges. |
| 作者： | wagner, c. r. muellerck, d. s. parola, a. c. hagerty, d. j. benedict, s. t. |
| 关键词： | field data, scour processes, physical models, flood events, field conditions, numerical models |
| 摘要： | Current application of scour-prediction equations overestimates scour depths around abutments and in contracted openings at many locations. Such excessive scour-depth prediction results in construction of unnecessarily deep foundations or installation of unnecessary countermeasures. Current methodologies available for predicting scour around abutments are based on laboratory-derived equations and cover only a narrow range of the wide variation of field conditions that commonly occur. Development of realistic scour-prediction equations must be based, at least in part, on field data. The use of field data is vital to understanding scour processes, to developing physical and numerical model studies that represent field conditions, to developing sound guidelines for implementing scour-prediction methodology, and for improving scour-prediction equations. Without an accurate field description of the dominant scour processes, the processes and associated parameters that may substantially influence scour during flood events cannot be accurately modeled in laboratory studies. Examples of processes identified in the field but not adequately represented in laboratory studies are the failure of spill-slope embankments into scour holes around bridge abutments, scour at piers affected by flow around abutments, pressure scour, and scour caused by flow redirected and contracted by ice or debris accumulations. The inclusion of these and other processes is likely to substantially change the methodology used to predict scour. / NOTE: Final rept. / Supplementary Notes: Prepared in cooperation with Geological Survey, Washington, DC. and Louisville Univ., KY. Sponsored by American Association of State Highway and Transportation Officials, Washington, DC. and Federal Highway Administration, Washington, DC. / 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： | u0711；299p |
| 报告类型： | 科技报告 |
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