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Open AccessArticle

Bedload Transport Monitoring in Alpine Rivers: Variability in Swiss Plate Geophone Response

1
Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Mountain Hydrology and Mass Movements, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland
2
Institute of Earth Surface Dynamics (IDYST), University of Lausanne (Switzerland), Géopolis, CH-1015 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(15), 4089; https://doi.org/10.3390/s20154089
Received: 9 June 2020 / Revised: 10 July 2020 / Accepted: 12 July 2020 / Published: 22 July 2020
(This article belongs to the Section Physical Sensors)
Acoustic sensors are increasingly used to measure bedload transport in Alpine streams, notably the Swiss plate geophone (SPG) system. An impact experiment using artificial weights is developed in this paper to assess the variability in individual plate response and to evaluate the extent to which calibration coefficients can be transferred from calibrated plates to non-calibrated plates at a given measuring site and/or to other measuring sites. Results of the experiment over 43 plates at four measuring sites have notably shown (a) that the maximum amplitude (V) recorded by individual plates tends to evolve as a power law function of the impact energy (J), with an exponent slightly larger than 1, for all the plates at all measuring sites; (b) that there is a substantial propagation of energy across plates that should be taken into account for a better understanding of the signal response; (c) that the response of individual plates is in most cases consistent, which suggests that calibration coefficients are comparable within and in between measuring sites, but site-specific and plate-specific variabilities in signal response have to be considered for a detailed comparison. View Full-Text
Keywords: bedload transport; acoustic sensors; Alpine stream; Swiss plate geophone system (SPG), impact experiment; sensor sensitivity; sensor calibration bedload transport; acoustic sensors; Alpine stream; Swiss plate geophone system (SPG), impact experiment; sensor sensitivity; sensor calibration
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MDPI and ACS Style

Antoniazza, G.; Nicollier, T.; Wyss, C.R.; Boss, S.; Rickenmann, D. Bedload Transport Monitoring in Alpine Rivers: Variability in Swiss Plate Geophone Response. Sensors 2020, 20, 4089.

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