Monitoring Scour Critical Bridges (2009) / Chapter Skim
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Pages 29-36
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29 The survey asked bridge owners various questions about their experiences with fixed scour monitoring instrument systems. This chapter includes a summary of their responses, as well as trends from the survey and the literature research.
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operation, maintenance, and repair costs are more difficult to ascertain. Instrument costs generally include the basic scour monitoring instrument and mounting hardware, as well as power supply, data logger, and instrument shelter/enclosure, where applicable.
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31 EVALUATION OF BENEFITS The majority of states mentioned safety for the traveling public as the main benefit of scour monitoring systems. Additional benefits included a reduced number of underwater and/or regular inspections, early identification of problems prior to a diving inspection, and insight into site-specific scour processes.
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depths with existing scour formulas highlighted some of the difficulties in scaling of scour depths from the laboratory to the field; however, a successful modeling strategy was applied. The laboratory model successfully reproduced the measured maximum scour depths in the field for both the bank-full and extreme flood events, and the details of cross-sectional changes immediately upstream of the bridge.
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33 INSTALLATION EXPERIENCE The type of contract used to install the scour monitoring systems varied and included bridge scour countermeasures, bridge rehabilitation, research, USGS projects, and emergency scour conditions. Figure 28 shows which parties were involved with the design, manufacture, and installation of the scour monitoring systems.
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LESSONS LEARNED FROM STATES THAT USE INSTRUMENTATION A wide variety of responses were obtained when the bridge owners were asked about lessons learned from the use of fixed scour monitoring instrumentation. The majority of states expressed concern regarding the maintenance of the scour monitoring systems.
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35 asked if they planned to use additional fixed or portable scour monitors in the future. Thirty-six percent of the respondents stated that they planned to use monitors, 19% said no, and 45% were not certain.
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Appendix G contains sample programs, guidelines, and manuals for fixed scour monitoring systems. ADVANCEMENTS AND INNOVATIONS Automated alarm systems can be installed as part of the scour monitoring systems.
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