Articles | Volume 6, issue 1
Earth Surf. Dynam., 6, 101–119, 2018

Special issue: 4-D reconstruction of earth surface processes: multi-temporal...

Earth Surf. Dynam., 6, 101–119, 2018

Research article 26 Feb 2018

Research article | 26 Feb 2018

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

Jack G. Williams et al.

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Cited articles

Abellán, A., Vilaplana, J. M., and Martínez, J.: Application of a long-range Terrestrial Laser Scanner to a detailed rockfall study at Vall de Núria (Eastern Pyrenees, Spain), Eng. Geol., 88, 136–148, 2006.
Abellán, A., Jaboyedoff, M., Oppikofer, T., and Vilaplana, J. M.: Detection of millimetric deformation using a terrestrial laser scanner: experiment and application to a rockfall event, Nat. Hazards Earth Syst. Sci., 9, 365–372,, 2009.
Abellán, A., Calvet, J., Vilaplana, J. M., and Blanchard, J.: Detection and spatial prediction of rockfalls by means of terrestrial laser scanner monitoring, Geomorphology, 119, 162–171, 2010.
Abellán, A., Oppikofer, T., Jaboyedoff, M., Rosser, N. J., Lim, M., and Lato, M. J.: Terrestrial laser scanning of rock slope instabilities, Earth Surf. Proc. Land., 39, 80–97, 2014.
Bae, K. H., Belton, D., and Lichti, D.D.: A framework for position uncertainty of unorganised three-dimensional point clouds from near-monostatic laser scanners using covariance analysis, Int. Arch. Photogramm., 36, 7–12, 2005.
Short summary
We present a method to analyse surface change using 3-D data collected at hourly intervals. This is applied to 9000 surveys of a failing rock slope, acquired over 10 months. A higher proportion and frequency of small rockfall is observed than in less-frequent (e.g. monthly) monitoring. However, quantifying longer-term erosion rates may be more suited to less-frequent data collection, which contains lower accumulative errors due to the number of surveys and the lower proportion of small events.