Abstract
Scour is a critical factor that affects the stability of a bridge. This paper presents a fundamental study on the development of a Time Domain Reflectometry (TDR) system for monitoring scour around a bridge pier. The laboratory experiments were conducted using a small-scale model pier with inner and outer diameters of 70 and 75 mm, respectively and a height of 200 mm. The model pier was embedded in a soil tank. Electrodes were installed in a circular array alongside the model pier to configure two-conductor transmission lines. Electromagnetic waves were generated and detected using the TDR. The experimental results indicate that the round-trip travel time of the electromagnetic waves increase with an increase in the scour depth. In addition, the estimated scour depth is approximately the same as the actual depth. This study demonstrates that the TDR is an effective tool for monitoring scour. Keywords: Bridge, Electromagnetic Wave, Scour, Time Domain Reflectometry
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