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- W568508726 abstract "Bridge scour is a major cause of bridge failure in the United States, accounting for more than half of the reported bridge failures. Monitoring or surveillance of scouring process around bridge foundation is an important and effective countermeasure to prevent bridge damage. The current scour monitoring technology include sonar, sliding collar, dropping weights or other techniques, such as neutral buoyancy “fish” and “smart rocks”. These technologies, while have merits, also have limitations due to the heavy weight, large volume or power supply issues. Time Domain Reflectometry (TDR) is another option to monitor bridge scour with advantages of being automatic and inexpensive. The senior author’s team has developed a few generations of TDR bridge scour monitoring system. In this study, an innovative spiral TDR sensor is proposed to further improve the resolution of TDR sensor. The spiral TDR sensor consists a center fiberglass rod with copper wires wrapped around. The copper wires serve as the waveguide for TDR signals. By using a spiral rather than straight path, this sensor has been found to have much higher resolution than the traditional straight probes, since the actual travel distance for the Electromagnetic (EM) wave each unit length is much longer than that of traditional probes. The new sensor is calibrated using liquid with known dielectric constant and moisture soil. Laboratory simulated scouring experiments are performed to evaluate the performance of the new spiral probe in detecting the sediment/water interface and therefore the scour/refill process. The tests results indicate that scour depth of less than 2cm can be easily detected by this new spiral sensor. Besides, the sediment layer thickness varies linearly with the square root of dielectric constant of water-sediment mixture measured by the spiral TDR probe, which matches the results of theoretical prediction. The estimated sediment thickness from TDR spiral sensor agrees very well with that measured by direct physical measurement." @default.
- W568508726 created "2016-06-24" @default.
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- W568508726 date "2015-01-01" @default.
- W568508726 modified "2023-09-23" @default.
- W568508726 title "Design and Performance Evaluation of A Spiral TDR Scour Sensor" @default.
- W568508726 hasPublicationYear "2015" @default.
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