Monitoring Scour Critical Bridges (2009) / Chapter Skim
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5OVERVIEW AND BACKGROUND The FHWA reports there are approximately 590,000 highway bridges in the U.S. National Bridge Inventory.
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watch) , land monitoring, and/or underwater inspections.
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7scour monitoring data are then transmitted from the master unit to a central office and/or posted on the Internet. Sonars Sonar scour monitors are mounted onto the pier or abutment face (Figures 3–6)
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is placed on the streambed around the rod. If the streambed erodes, the collar moves or slides down the rod into the scour hole.
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9with a radio signal. The signal is detected by a receiver in an instrument shelter on or near the bridge.
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10 Sounding Rods, also known as BRISCO™ Monitors Sounding-rod or falling-rod instruments are manual or mechanical (automated) gravity-based physical probes.
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11 and other sources. Figure 15 shows the number of bridge sites for each type of scour monitoring instrument.
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near the bridge substructure. The other types of devices are usually one or two per pier location.
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