ABSTRACT
The Swiss Plate Geophone (SPG) system is a surrogate monitoring technique which has been calibrated to determine bedload flux in the Swiss mountain river Albula. The so-called impulse counts derived from the geophone signal are converted into bedload fluxes. The bedload transport measuring installation is located a few hundred meters upstream of a runoff gauging station in the village of Tiefencastel. The most important bedload transporting flows generally occur during the snowmelt period with additional runoff generation due to rainfall events. We present and discuss the variability of bedload transport during the summer periods from 2015 to 2018. We also compare the annual bedload masses in the Albula river with measurements made with the SPG system in mountain rivers in Austria. Furthermore, we show how well averaged values of measured bedload transport can be predicted with bedload transport equations which were not calibrated with the measurements at the Albula River.
