Laboratory Evaluation of Time-Domain Reflectometry for Bridge Scour Measurement: Comparison with the Ultrasonic MethodReport as inadecuate




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Advances in Civil EngineeringVolume 2010 2010, Article ID 508172, 12 pages

Research ArticleDepartment of Civil Engineering, Case Western Reserve University, 10900 Euclid Avenue, Bingham 203C, Cleveland, OH 44106-7201, USA

Received 10 December 2009; Revised 28 March 2010; Accepted 6 May 2010

Academic Editor: Piervincenzo Rizzo

Copyright © 2010 Xinbao Yu and Xiong Yu.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Bridge scour is a major factor causing instability of bridges crossing waterways.
Excessive scour contributes to their high construction and maintenance costs.
Design of innovative scour-monitoring instrumentation is essential to ensure the safety of scour-critical bridges.
The ability of real-time surveillance is important since the most severe scour typically happens near the peak flood discharge.
A new scour-monitoring instrument based on the Time Domain Reflectometry TDR principle has been developed to provide real-time monitoring of scour evolution.
A framework based on dielectric mixing model has been developed, which can be easily incorporated into an automatic analysis algorithm.
This paper introduces a comparative study of TDR method and ultrasonic method for scour measurements.
The results indicate that both TDR and ultrasonic methods can accurately estimate scour depth.
TDR method, with the developed analysis algorithm, yields information on the river properties such as the electrical conductivity of river water and the density of sediments.
TDR methods are also found less influenced by turbulence and air bubbles, both likely to occur during flood events.





Author: Xinbao Yu and Xiong Yu

Source: https://www.hindawi.com/



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