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Description
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Abstract. Currently, findings in landslide laboratory experiments are limited by observation techniques, which either deliver only external information (e.g. using high-speed videos), or internal information using wired sensors that confine the free motion of the mass. However, an unconfined internal observation of the internal dynamics of a moving landslide mass is essential for an adequate understanding of these natural hazards. The present study introduces an autonomous and wireless probe to characterise motion features of single clasts within artificial laboratory-scale landslides. The Smartstone probe is based on an inertial measurement unit (IMU) and records acceleration and rotation at a sampling rate of 100 Hz. The recording ranges are ± 16 g (accelerometer) and ± 2000° s−1 (gyroscope). The plastic tube housing is 55 mm long with a diameter of 10 mm. The probe is controlled and data is read out via active radio frequency identification (active RFID) technology. Due to this technique, the probe works under low-power conditions enabling the use of small button cell batteries and minimising its size. Using the Smartstone probe, the motion of approx. 520 kg of an uniformly-graded pebble material was observed in a laboratory experiment. Single pebbles were equipped with probes and placed embedded and superficially in/on the mass. In a first analysis step, the data of one pebble is interpreted qualitatively, allowing for the determination of different transport modes, such as translation, rotation and saltation. In a second step, the motion was quantified my means of derived movement characteristics: The analysed pebble moved mainly in vertical direction during the first motion phase with a maximal vertical velocity of approx. 1.7 m s−1. A strong acceleration peak of approx. 36 m s−2 was interpreted as pronounced hit and led to a complex rotational motion pattern. In a third step, displacement was derived and amounts to approx. 1.1 m in vertical direction. The deviation compared to laser distance measurements was approx. −10 %. Furthermore, a full 3-dimensional spatiotemporal trajectory of the pebble was reconstructed and visualised supporting the interpretations. Finally, it is demonstrated that multiple pebbles can be analysed simultaneously within one experiment, allowing for motion sampling of different parts of a moving landslide. (2020-03-06)
***This entry has been automatically imported via OpenAlex by LIST harvest scripts. Please refer to https://doi.org/10.5194/nhess-2020-61 for the original and latest version of the publication*** (2026-07-01)
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Keyword
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Inertial measurement unit, Landslide, Accelerometer, Pebble, Gyroscope, Rotation (mathematics), Acoustics, Remote sensing, Geology, Geodesy, Mechanics, Physics, Computer science, Engineering, Aerospace engineering, Geotechnical engineering, Artificial intelligence |