Authors: Williams, JG; Rosser, NJ; Afana, A; Hunter, G; Hardy, RJ

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Williams, JG, Rosser, NJ, Afana, A, Hunter, G & Hardy, RJ 2013, 'Can full waveform technology enhance the use of terrestrial laser scanning to monitor rock slope deformation?', in PM Dight (ed.), Slope Stability 2013: Proceedings of the 2013 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 763-774,

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The reliable monitoring of slope deformation is a significant parameter for mitigating landslide damages, including business disruption and danger to workers. Despite this, remote sensing of surface deformation used to interpret failure mechanisms at the shear zone remains limited by factors such as the resolution and viewing angle of monitoring. Here we present an analysis of data captured using a new generation of full waveform terrestrial laser scanners (FW-TLS), which offers potential gains for near realtime rock slope monitoring. This approach, having evolved from recent advances in airborne LiDAR, resolves the structure of the reflected laser signal (the waveform) from which a series of attributes of the surface character, geometry and deformation are extracted. The influence of target geometry, analogous to a deforming rock face, on the reflected waveform is interpreted from a set of controlled condition datasets. The analysis highlights the sensitivity of the maximum amplitude, relative to other parameters of the waveform, to changes in target geometry. We conclude by considering the implications for slope deformation monitoring of this new approach.

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