Circular time-domain reflectometry system for monitoring bridge scour depth

Jung Doung Yu, Jong Sub Lee, Hyung Koo Yoon

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Sediment has a severe effect on bridge stability, and time-domain reflectometry (TDR) is a suitable method for assessing scour depth. This paper presents a fundamental study to demonstrate the suitability of a circular TDR system to enhance the resolution when monitoring scour depth with consideration of detailed local changes over a wide area around piers. A total of 32 electrodes are vertically installed on a cylinder pier around the circumference at ∼7.36 mm intervals. Scour depth is investigated through small-scale laboratory experiments, where a measured waveform reflects the artificially constructed scour depth with high resolution (≈5 mm). Different scour types including circular, mushroom, elliptical, and irregular shapes are developed to verify the application of circular TDR, and shapes are predicted through the detailed local distribution. The influences of the reflected waveform according to water level change, temperature variation, and salinity effect are investigated as additional considerations, and the relative deviation of scour depth is analyzed. This study demonstrates that the proposed circular TDR system achieves better resolution than existing single TDR systems and may provide a better alternative technique for monitoring scour depth.

Original languageEnglish
Pages (from-to)312-321
Number of pages10
JournalMarine Georesources and Geotechnology
Volume38
Issue number3
DOIs
Publication statusPublished - 2020 Mar 15

Keywords

  • Circular TDR system
  • laboratory experiments
  • scour
  • stability
  • time-domain reflectometry

ASJC Scopus subject areas

  • Oceanography
  • Geotechnical Engineering and Engineering Geology
  • Ocean Engineering

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