Identification and determination of avalanche speed by using radar interferometry –A case study in Varangah Rud at Chalous Road, Iran

Document Type : Original Research Article


Department of Physical Geography, Faculty of Geography, University of Tehran, Tehran, Iran


Avalanche is one of the natural disasters that annually inflicts heavy casualties on human societies, especially the world's transportation systems, especially in mountainous areas. The use of remote sensing and radar interference knowledge is one of the expanding and efficient methods in identifying changes in the earth's surface, especially avalanches. In this study, radar imaging interference and offset tracking techniques were used to identify the avalanche incident on Chalus Road. The basis of this method is to determine the extent of changes in the characteristics of the Earth's surface, which is determined by changes in radar redistribution. This process is done by comparing the Sentinel-1 radar images before and after the event. After ensuring the results of radar interference by matching it in the Google Earth environment, using the histogram diagram, the frequency changes of radar distribution pixels, the average velocity of avalanche mass displacement in the domain were determined. Based on this, the maximum velocity of Avalanche mass was 45 cm and the maximum displaced volume of Avalanche mass was determined on a slope with a velocity of 5 cm per day, which indicates that the snow mass forming Avalanche has been moved in several stages and along with geomorphological characteristics. The area, the snowfall, and the increase in its volume on the slope have gradually overcome the frictional force between the slope surface and the lower part of the snow mass, causing the avalanche mass to move down the road.


Main Subjects

  1. Al-Madrassi, A. & Delavar, A., 2013. Identification of avalanche-prone areas by using GIS (Geographic Information System), Journal of Environmental Hazards, 3, p.1-15 (In persain).
  2. Birudian, N., 2003. Snow and Avalanche (Management of Snow-covered areas), Imam Reza University Press (In persain).
  3. Eckerstorfer, M., Malnes, E., Frauenfelder, R., Domaas, U. & Brattlien, K., 2014. Avalanche debris detection using satellite-borne radar and optical remote sensing. In Proceedings of the Inter-15 National Snow Science Workshop, p. 122-128.
  4. Eckerstorfer, M., Bühler, Y., Frauenfelder, R. & Malnes, E., 2015. Remote sensing of snow avalanches: Recent advances, potential, and limitations. Cold Regions Science and Technology, 121, p. 126-140.
  5. Eckerstorfer, M., Malnes, E. & Müller, K., 2017. A complete snow avalanche activity record from a Norwegian forecasting region using Sentinel-1 satellite-radar data, Cold Regions Science and Technology, 144, p. 39-51.
  6. Fredston, J. & Fesler, D., 1994. Snow Sense: A Guide to Evaluating Snow Avalanche Hazard, Alaska Mountain Safety Center, 116p.
  7. Gabriel, A.K., Goldstein, R.M. & Zebker, H.A., 1989. Mapping small elevation changes over large areas: Differential radar interferometry, Journal of Geophysical Research Soil Earth, 94, p. 9183-9191 (In persain).
  8. Ghelichi, E., 2012. Effects of morphoclimatic and morphodynamic domains on the construction of roads in mountainous areas of the study area of Karaj-Chalous road to Kandovan tunnel, M.Sc. thesis, Tarbiat Modares University (In persain).
  9. Martinez-Vazquez, A. and Fortuny-Guasch, J., 2008. A GB-SAR processor for snow avalanche identification. IEEE Transactions on Geoscience and Remote Sensing, 46(11), p.3948-3956.
  10. Mears, A.I., 1992. Snow-avalanche hazard analysis for land-use planning and engineering (No. 49). Colorado Geological Survey, Department of Natural Resources, State of Colorado.
  11. Ozzi, R., 2011. Geography of Hazards. Tabriz University Press, 470p (In persain).
  12. Qanavati, E. & Karimi, J., 2009. Bahman Danger Zone on Haraz Road based on Geomorphological Characteristics, Journal of Applied Research in Geographical Sciences, 9(12), p. 83-100 (In persain).
  13. Rajaei, A., 2010. The study of avalanches and its danger zone and providing solutions (case study of Semirom city), Master's thesis, Azad University, Tehran Research Sciences Branch (In persain).
  14. Skrede, I., Kristensen, L. & Rivolta, C., 2016. Use of ground based insar radar to monitor glide avalanches, Proceedings, International Snow Science Workshop. Breckenridge, Colorado.
  15. Wiesmann, A., Caduff, R., Strozzi, T., Papke, J. & Mätzler, C., 2014. Monitoring of dynamic changes in alpine snow with terrestrial radar imagery. IEEE Transactions on Geoscience and Remote Sensing, p.3662-3665