Deliverable D1.4. Rockfall and landslide warning system on the Raume Line
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- NGI report 
A prototype rockfall and landslide warning system has been installed at a high frequent rockfall site on the Rauma line, north-western Norway. The system is based on a wireless microseismic sensor network, and uses a combination of geophones and magnetometers to identify vibrations in the railway line, generated upon impact of falling rocks or landslide debris. The aim of the system is to identify when events with potential to generate obstructions or damage to the track has occurred, and to issue an automatic warningto the driver of the next passing train of the potential hazard. A set of algorithms to identify the different types of events generating vibrations in a railway line has been implemented. The ability to identify rockfalls were tested on an abandoned track section, using a sledgehammer to simulate impact. During these tests the system automatically identified all impacts sufficiently strong to generate a shockwaves in track. Detection of landslides is based on an algorithm previously used for detection of avalanches, having a proven track record. Identification of trains and rolling-stock is achieved using magnetometers, and has so far had an absolute success rate on site. At the time of writing the prototype has been in operation for a little more than four months, and during this period there has not been any naturally occurring rockfalls or landslides. An extended testing period is needed before making a final conclusion on the reliability and applicability of the technology as a warning system. The technology is reliable, has low maintenance requirement and is easy to install onsite without interfering with normal traffic.