Abstract
www.wsl.ch The very active Illgraben torrent in Switzerland with statistically 5-6 debris flows per year was used for this study. Six geophones, one radar device, two ultrasonic devices, two video cameras, a debris flow force plate and three rain gauges are installed in the Illgraben catchment. The geophones measure the vibrations produced by a passing debris flow and are also used to trigger the other measuring devices. The reach-wise front velocity of debris flows is calculated using the time of travel between the measuring devices. The most unique device is the debris flow force plate, in use since 2004. With the instantaneous measurement of the debris weight and flow height, the bulk density and the water content of a passing debris flow can be reconstructed
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