Abstract
For prevention/reduction of damage caused by large-scale sediment disaster, it is important to conduct field surveys and preventive measures by detecting the areas of minor slope movement as a sign of such sediment disaster at an early stage. As a technology for wide-area and routine monitoring of slope movement sites, Differential Interferometric SAR (DInSAR) analysis using L-band SAR satellite is effective in Japan. Accordingly, we studied a method of estimating the areas of slope movement representing a high possibility of landslide with interference fringes detected by DInSAR Analysis. This study compared actual slope movement area obtained from LiDAR data with the area estimated considering interference fringes and micro-topography and evaluated the consistency between both areas. As areas for estimating slope movement, we set up a total of four patters—two patterns of the area of interference fringes according to the frequency of appearance when interference fringe was detected at two or more timings, one pattern of the area considering the surrounding microtopography, and one pattern of the area considering the whole slope. As the result, it was found that the area of slope movement close to that of actual slope movement can be estimated by estimating as slope movement area an area that is around the area with a high appearance frequency of interference fringe and has micro-topography shaped according to the estimated direction of slope movement.
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Acknowledgements
The authors appreciate the Japan Aerospace Exploration Agency for provision of ALOS/PALSAR data, Geospatial Information Authority of Japan for the InSAR Analysis results in Case No. 7. The results of LiDAR and figuring out microtopography in each Case was provided by Shinjo River Office (Case No. 1–No. 3), Matsumoto Sabo Office (Case No. 4–No. 6), Shizuoka Prefecture (Case No. 7), Shizuoka River Office (Case No. 7), Kii Mountains Sabo Office (Case No. 8–No. 9), and Shikoku Mountains Sabo Office (Case No. 10). The results of GPS measurement in each Case was provided by Shinjo River Office (Case No. 1–No. 3), and Niigata Prefecture (Case No. 4).
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Kamiyama, J., Kunitomo, M., Sakagami, M., Hirata, I., Yoshikawa, K., Nishikawa, D. (2017).
Method of Estimating Slope Movement Area Using DInSAR Analysis.
In: Mikos, M., Tiwari, B., Yin, Y., Sassa, K. (eds) Advancing Culture of Living with Landslides. WLF 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-53498-5_27
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DOI: https://doi.org/10.1007/978-3-319-53498-5_27
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