| Summary: | 碩士 === 臺灣大學 === 土木工程學研究所 === 98 === Because of strong flow and high turbidity, it is difficult to observe the scour during floods. To scan river bed under flood, this thesis explores the potential of using acoustical monitoring, applied to a scale model of Houfeng Bridge. In the case of the Houfeng Bridge collapse during the 2008 Sinlaku typhoon, a submerged pipeline upstream of the bridge, led to the undermining of the bridge supports, ultimately leading to its destruction. We transformed field and survey data into a small-scale laboratory experiment. The Sonix ultrasound system was used to view the erosion process ahead of the modeled bridge. The experiment results were compared using flow modeling software, Flow 3D, to verify the laboratory model design. The ultrasound results were presented in a digital terrain model to see changes in the river bed due to erosion. It was found that we could observe the phenomenon in turbid water conditions and capture terrain profiles from ultrasound images. The acoustical camera also provides information about moving stones and structural elements.
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