Preprints
https://doi.org/10.5194/esurf-2021-72
https://doi.org/10.5194/esurf-2021-72

  19 Oct 2021

19 Oct 2021

Review status: this preprint is currently under review for the journal ESurf.

Signal response of the Swiss plate geophone monitoring system impacted by bedload particles with different transport modes

Zheng Chen1,2,3, Siming He1, Tobias Nicollier2, Lorenz Ammann2, Alexandre Badoux2, and Dieter Rickenmann2 Zheng Chen et al.
  • 1Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China
  • 2Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, 8903, Switzerland
  • 3University of Chinese Academy of Sciences, Beijing, 100049, China

Abstract. Controlled experiments were performed to investigate the acoustic signal response of the Swiss plate geophone (SPG) system impacted by bedload particles varying in size, impact angle and transport mode. The impacts of bedload particles moving by saltation, rolling, and sliding were determined by analyzing the experimental videos and corresponding vibration signals. For a particle impact on the bed or on the geophone plates, the signature of the generated signal in terms of maximum amplitude, number of impulses and centroid frequency was extracted from the raw monitoring data. So-called signal packets were determined by performing a Hilbert transform of the raw signal. The number of packets was calculated for each transport mode and for each particle size class, with sizes ranging from 28.1 mm to 171.5 mm. The results show how the number of signal impulses per particle mass, the amplitude of the signal envelope, and the centroid frequency change with increasing particle size, and they also demonstrate the effect of bedload transport mode on the signal response of the SPG system. We found that there is a general increase in the strength of the signal response or in the centroid frequency when the transport mode changes from sliding to rolling to saltation. The findings of this study help to better understand the signal response of the SPG system for different bedload transport modes, and may also contribute to an improvement of the procedure to determine bedload particle size from the SPG signal.

Zheng Chen et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on esurf-2021-72', Anonymous Referee #1, 28 Nov 2021 reply

Zheng Chen et al.

Zheng Chen et al.

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Short summary
Quantification of bedload transport constitutes a challenge in river dynamics due to variable transport modes. We used passive monitoring device to record acoustic signals generated by bedload particles moving with different transport modes and established relationship between signal and bedload characteristics. The findings in present study could improve the understanding of our monitoring system and bedload transport process, contributing to bedload size classification as well.