The Swiss plate geophone is a bedload surrogate monitoring system that had been calibrated in several gravel-bed streams through field calibration measurements. Field calibration measurements are generally expensive and time consuming, therefore we investigated the possibility to replace it by a flume-based calibration approach. We applied impulse-diameter relations for the Swiss plate geophone obtained from systematic flume experiments to field calibration measurements in four different gravel-bed streams. The flume-based relations were successfully validated with direct bedload samples from field measurements, by estimating the number of impulses based on observed bedload masses per grain size class. We estimated bedload transport mass by developing flume-based and stream-dependent calibration procedures for the Swiss plate geophone system using an additional empirical function. The estimated masses are on average in the range of ±90% of measured bedload masses in the field, but the accuracy is generally improved for larger transported bedload masses. We discuss the limitations of the presented flume-based calibration approach. This article is protected by copyright. All rights reserved.
Architecture, Civil Engineering, Surveying