Author(s): Manuel Pirker; Hannes Badura; Josef Schneider

Linked Author(s): Josef Schneider

Keywords: Sediment Transport; Sediment measurement techniques; Bedload sediment

Abstract: Quantitative monitoring of sediment transport is a challenging task involving a wide range of stakeholders. It can be used to study the effects of thawing permafrost due to climate change in the Alpine region based on the transported volume in mountain streams. Furthermore, monitoring sediment transport during reservoir flushing is also of utmost interest. Not only is the suspended sediment concentration a factor in limiting the environmental impact of such flushing, but also the duration and volume of bedload transport are important. Real time monitoring of bedload transport can limit the duration of reservoir flushing and prevent premature termination. Our goal is to develop a measurement system that can determine the onset and termination of bedload transport across a weir to optimize flushing duration. We also want to give an estimate on the passing grain size based on the impact characteristics. For this purpose, we installed 3 plate accelerometers along the weir crest of a run-of-river power plant on the Salzach river for monitoring during flushing. Beforehand, these plates are tested in the flume of our laboratory, where we are able to simulate almost field-like flow velocities. The sensors are calibrated on a sediment range typical for the Salzach river. So far, we are able to determine the onset and termination of bedload transport; the laboratory results still need to be evaluated.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p0895-cd

Year: 2023