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Application of the Wavelet Transform to Sediment Grain Sizes Analysis with an Impact Plate for Bedload Monitoring in Sediment Bypass Tunnels

Author(s): Takahiro Koshiba; Tetsuya Sumi

Linked Author(s): Tetsuya Sumi

Keywords: No Keywords

Abstract: An impact plate (IP) is a bedload transport monitoring device developed for a part of the sediment bypass tunnels management. In the measurement, the impact produced by bedload is recorded as the number of impulseswhich is widely used in Japan. Ip, however, has several shortcomings attributed to the insufficient raw signal denoising. In this study, the discrete wavelet transform (DWT), an advanced signal processing technique especially for noisy, non-periodical, and transient signals, was introduced to devise an improved Ip count system solving the problems in the original signal denoising process. The presented results revealed that the DWT is useful for water noise reduction, signal overlap reduction, and mitigating Ip saturation at grain sizes Ds=50 and 100 mm compared to the original Ip counting system.


Year: 2018

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