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A platform for research: civil engineering, architecture and urbanism
Evaluation of Pier-Scour Measurement Methods and Pier-Scour Predictions with Observed Scour Measurements at Selected Bridge Sites in New Hampshire, 1995-98
This report summarizes research conducted to evaluate pier-scour measurement methods and predictions at many of these sites. This evaluation included measurement of pier-scour depths at 20 sites using ground-penetrating radar (GPR). Pier-scour was also measured during floods by teams at 5 of these 20 sites. At 4 of the 20 sites, fixed instruments were installed to monitor scour. At only one bridge site investigated by a team was any pier scour measurable during a flood event. Measurements made using GPR and/or fixed instruments indicated pier scour at 6 sites. The GPR surveys indicated scour along the pier side and further upstream from the nose that was not detected by flood-team measurements at 2 sites. Most pier-scour equations selected for this examination were reviewed and published in previous scour investigations. Graphical comparison of residual pier-scour depths indicate that the Shen equation yielded scour depth predictions closest to those measured, without underestimating. Measured depths of scour, however, were zero feet for 14 of the 20 sites. For the Blench-Inglis II equation and the Simplified Chinese equation, most differences between measured and predicted scour depths were within 5 feet. These two equations underpredicted scour for one of six sites with measurable scour. The underprediction, however, was within the resolution of the depth measurements.
Evaluation of Pier-Scour Measurement Methods and Pier-Scour Predictions with Observed Scour Measurements at Selected Bridge Sites in New Hampshire, 1995-98
This report summarizes research conducted to evaluate pier-scour measurement methods and predictions at many of these sites. This evaluation included measurement of pier-scour depths at 20 sites using ground-penetrating radar (GPR). Pier-scour was also measured during floods by teams at 5 of these 20 sites. At 4 of the 20 sites, fixed instruments were installed to monitor scour. At only one bridge site investigated by a team was any pier scour measurable during a flood event. Measurements made using GPR and/or fixed instruments indicated pier scour at 6 sites. The GPR surveys indicated scour along the pier side and further upstream from the nose that was not detected by flood-team measurements at 2 sites. Most pier-scour equations selected for this examination were reviewed and published in previous scour investigations. Graphical comparison of residual pier-scour depths indicate that the Shen equation yielded scour depth predictions closest to those measured, without underestimating. Measured depths of scour, however, were zero feet for 14 of the 20 sites. For the Blench-Inglis II equation and the Simplified Chinese equation, most differences between measured and predicted scour depths were within 5 feet. These two equations underpredicted scour for one of six sites with measurable scour. The underprediction, however, was within the resolution of the depth measurements.
Evaluation of Pier-Scour Measurement Methods and Pier-Scour Predictions with Observed Scour Measurements at Selected Bridge Sites in New Hampshire, 1995-98
E. M. Boehmler (author) / J. R. Olimpio (author)
2000
60 pages
Report
No indication
English
Highway Engineering , Civil Engineering , Scouring , Bridge piers , New Hampshire , Equations , Hydraulic engineering , Mathematical models , Field tests , Drainage , Highway bridges , Flood flow , Tables(Data) , Damage assessment , Stream flow , Bridge inspections , Program evaluation , Ground penetrating radar
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