Applications of Thermal Images for Monitoring Surficial Temperature Changes of Naked Slope

  • Chien-Yuan Chen
Keywords: thermography, landslide, monitoring


Global climate change causes increases in the torrential rainfall brought by typhoons and the monsoon in Taiwan. Torrential rain in turn causes landslides, debris flows, and the formation of earth dams. Most dams were formed in remote mountainous areas and are difficult to reach for safety evaluation at the beginning of their formation. A long distance and non-destructive testing methodology is necessary for evaluating the safety of landslide dams. This study used an infrared imager for monitoring naked slopes. The thermography can detect surficial radiation temperature changes in the slope to locate potential unstable areas for further monitoring. This study proposes radiation temperature change (T) per unit of time (Δt) as an index (T /Δt) for nondestructive monitoring. The index was used for monitoring and analysis of artificial earth dams constructed at Huishun farm in Nantou County. The results of the analysis show that the failure zone of the artificial dam exhibited the greatest change in the index and the potential failure mode could be predicted once the dam breached. The proposed model could be used for potential unstable slope monitoring.


C. Y. Chen and J. M. Chang, “Landslide dam formation susceptibility analysis based on geomorphic features,” Landslide, vol. 13, no. 5, pp. 1019-1033, October 2016.

O. Korup, “Recent research on landslide dams - a literature review with special attention to New Zealand,” Progress in Physical Geography, vol. 26, no. 2, pp. 206-235, June 2002.

I. Baroň, D. Bečkovský, and L. MíčaI, “Application of infrared thermography for mapping open fractures in deep-seated rockslides and unstable cliffs,” Landslides, vol. 11, no. 1, pp. 15-27, February 2014.

T. Nolesini, W. Frodella, S. Bianchini, and N. Casagli, “Detecting slope and urban potential unstable areas by means of multi-platform remote sensing techniques: the Volterra (Italy) case study,” Remote Sensing, vol. 8, no. 9, p. 746, September 2016.

J. H. Wu, H. M. Lin, D. H. Lee, and S. C. Fang, “Integrity assessment of rock mass behind the shotcreted slope using thermography,” Engineering Geology, vol. 80, no. 1-2, pp. 164-173, August 2005.

S. Martino and P. Mazzanti, “Integrating geomechanical surveys and remote sensing for sea cliff slope stability analysis: the Mt. Pucci case study (Italy),” Natural Hazards and Earth System Sciences, vol. 14, pp. 831-848, April 2014.

S. Mineo, G. Pappalardo, F. Rapisarda, A. Cubito, and G. Di Maria, “Integrated geostructural, seismic and infrared thermography surveys for the study of an unstable rock slope in the Peloritani Chain (NE Sicily),” Engineering Geology, vol. 195, pp. 225-235, September 2015.

C. Y. Chen, S. C. Chen, and K. H. Chen, “Earth dam monitoring by using infrared thermography detection,” Proceedings of Engineering Technology and Innovation, vol. 4, pp. 40-42, 2016.

How to Cite
C.-Y. Chen, “Applications of Thermal Images for Monitoring Surficial Temperature Changes of Naked Slope”, Proc. eng. technol. innov., vol. 5, pp. 37-40, Aug. 2017.