Detection and spatial prediction of rockfalls by means of terrestrial laser scanner monitoring

Abellán, Antonio; Calvet, Jaume; Vilaplana, Joan Manuel; Blanchard, Julien

doi:10.1016/j.geomorph.2010.03.016

Cited by 226 publications

(151 citation statements)

References 32 publications

(43 reference statements)

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“…For ALS this comes from the fact that GPS has Abellan et al 2010) become available for public application during the mid-1990s. The TLS device market developed later because of the lack of software for 3D data processing and problems for handling huge amount of data (point clouds with several millions of points).…”

Section: Discussion and Perspectivesmentioning

confidence: 99%

“…A great improvement in the rockfall hazard assessment is the monitoring of fallen blocks from a cliff between two epochs or more (Rosser et al 2005;Lim et al 2006;Lato et al 2009;Abellan et al 2010;Pedrazzini et al 2010). Indeed, such approaches allow for the quantification of the magnitude and activity of rockfalls in a cliff.…”

Section: Tlsmentioning

confidence: 99%

“…125 cm/day preceding a 170,000 m 3 partial collapse of the Eiger rockslide, Oppikofer et al 2008) and fragmental rockfalls (e.g. centimetric displacements preceding rockfalls with few to hundred cubic metres, Abellan et al 2009Abellan et al , 2010 (Fig. 8).…”

Section: Rockfallmentioning

confidence: 99%

“…InSAR techniques are mainly dedicated to the detection and the quantification of small displacements over large areas. LIDAR (or laser scanning) provide high-resolution point clouds of the topography and has several applications that range from mapping (Ardizzone et al 2007;Jaboyedoff et al 2008a) to monitoring deformation (Gordon et al 2001), landslides or rockfall displacements (Teza et al 2007;Oppikofer et al 2008;Abellan et al 2010) to landslide in soils (Jaboyedoff et al 2009a). The joint use of terrestrial laser scanning (TLS) and SAR techniques may help to understand landslide phenomena, as is discussed in Teza et al (2008).…”

Section: Introductionmentioning

confidence: 99%

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Use of LIDAR in landslide investigations: a review

et al. 2010

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This paper presents a short history of the appraisal of laser scanner technologies in geosciences used for imaging relief by high-resolution digital elevation models (HRDEMs) or 3D models. A general overview of light detection and ranging (LIDAR) techniques applied to landslides is given, followed by a review of different applications of LIDAR for landslide, rockfall and debris-flow. These applications are classified as: (1) Detection and characterization of mass movements; (2) Hazard assessment and susceptibility mapping; (3) Modelling; (4) Monitoring. This review emphasizes how LIDARderived HRDEMs can be used to investigate any type of landslides. It is clear that such HRDEMs are not yet a common tool for landslides investigations, but this technique has opened new domains of applications that still have to be developed.

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Section: Discussion and Perspectivesmentioning

confidence: 99%

Section: Tlsmentioning

confidence: 99%

Section: Rockfallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of LIDAR in landslide investigations: a review

et al. 2010

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“…Near-continuous TLS has the potential to generate a considerable number of point clouds (> 10 3 -10 4 ), representing a 2 to 3 order of magnitude increase in data volume over previous terrestrial lidar monitoring campaigns with lower temporal resolution (e.g. Teza et al, 2007;Abellán et al, 2010;Rosser et al, 2013;Royán et al, 2015). Key attributes of the techniques developed to process such datasets therefore relate to computational efficiency, the ability to automate processing, and minimising the accumulation of error between each survey pair.…”

Section: Processing Techniques For Near-continuous Surface Monitoringmentioning

confidence: 99%

Optimising 4-D surface change detection: an approach for capturing rockfall magnitude–frequency

et al. 2018

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Abstract. We present a monitoring technique tailored to analysing change from near-continuously collected, high-resolution 3-D data. Our aim is to fully characterise geomorphological change typified by an event magnitude-frequency relationship that adheres to an inverse power law or similar. While recent advances in monitoring have enabled changes in volume across more than 7 orders of magnitude to be captured, event frequency is commonly assumed to be interchangeable with the time-averaged event numbers between successive surveys. Where events coincide, or coalesce, or where the mechanisms driving change are not spatially independent, apparent event frequency must be partially determined by survey interval.The data reported have been obtained from a permanently installed terrestrial laser scanner, which permits an increased frequency of surveys. Surveying from a single position raises challenges, given the single viewpoint onto a complex surface and the need for computational efficiency associated with handling a large time series of 3-D data. A workflow is presented that optimises the detection of change by filtering and aligning scans to improve repeatability. An adaptation of the M3C2 algorithm is used to detect 3-D change to overcome data inconsistencies between scans. Individual rockfall geometries are then extracted and the associated volumetric errors modelled. The utility of this approach is demonstrated using a dataset of ∼ 9 × 10 3 surveys acquired at ∼ 1 h intervals over 10 months. The magnitude-frequency distribution of rockfall volumes generated is shown to be sensitive to monitoring frequency. Using a 1 h interval between surveys, rather than 30 days, the volume contribution from small (< 0.1 m 3 ) rockfalls increases from 67 to 98 % of the total, and the number of individual rockfalls observed increases by over 3 orders of magnitude. High-frequency monitoring therefore holds considerable implications for magnitude-frequency derivatives, such as hazard return intervals and erosion rates. As such, while high-frequency monitoring has potential to describe short-term controls on geomorphological change and more realistic magnitude-frequency relationships, the assessment of longer-term erosion rates may be more suited to less-frequent data collection with lower accumulative errors.

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Spatial and temporal variations in rockfall determined from TLS measurements in a deglaciated valley, Switzerland

et al. 2015

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Steep U-shaped valleys produced by glaciation are commonly eroded by rockfall. In this study we investigate modern and long-term (power law predicted) rates of rock wall retreat in a deglaciated valley. Our emphasis is on the 5.2 km 2 calcareous cliffs covering in the Lauterbrunnen Valley, Switzerland.Terrestrial laser scans were collected during nine field campaigns over 18 months to provide a continuous coverage of most of the valley walls. Results indicate a total of 122 rockfalls with volumes ranging between 0.06 ± 0.01 and 119.34 ± 1.07 m 3. Different size groups of rockfall events were correlated with environmental factors (e.g., freeze-thaw cycles/temperature, precipitation, and seismicity) using a linear regression with variable lag times of 0-6 months. The highest correlation factor (r = 0.6, P = 0.08, 90% significance level) is observed for freeze-thaw cycles and rockfall events smaller than 1 m 3 with a 2 month delay between temperature extremes and rockfall. Frequency-magnitude relationships for rockfall events were calculated to predict less frequent larger rockfall events that did not occur during the observation period. A Monte Carlo analysis was applied to the frequency-magnitude relationship to evaluate the sensitivity of results to their stochastic nature. An average power law exponent of 1.71 ± 0.09 was calculated using linear regression. The calculated exponents are similar to other studies in calcareous rock settings conducted over different observation durations. Finally, we determine an average total eroded volume of 2:0

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Detection and spatial prediction of rockfalls by means of terrestrial laser scanner monitoring

Cited by 226 publications

References 32 publications

Use of LIDAR in landslide investigations: a review

Use of LIDAR in landslide investigations: a review

Optimising 4-D surface change detection: an approach for capturing rockfall magnitude–frequency

Spatial and temporal variations in rockfall determined from TLS measurements in a deglaciated valley, Switzerland

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