An Attempt to Create Applied Geomorphological Maps of Mountainous Areas by Aerial Photograph Interpretation

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Other Title
  • 空中写真判読による山地の応用地形学図作成の試み
  • ―A Case Study of Large-Scale Landslide Activity―
  • ―大規模地すべり地の活動状況調査の事例―

Abstract

<p>The time-series changes in landslide micro-topography type were studied and confirmed based on aerial photograph interpretation using six periods of large-scale landslides，mass movement landforms in mountainous areas. The aerial photographs used in this study were taken in 1947, 1957, 1974, 1983, 2004, 2014，respectively. Landslide topography was extracted using the Red Relief Image Map created from 5 m DEM. A “landslide block activity transition status map” was created as an applied geomorphological map, in which the activity status of each micro-topography type was estimated over a time scale of about 70 years. The new appearance of each micro-topography type was extracted by aerial photograph interpretation, and the new appearance of ground surfaces, small landslide blocks, collapsed areas, cracks, etc. were compared and analyzed with aerial photographs taken during the previous period. This method was confirmed to be effective in tracing the onset of localized displacement such as slow movement and toe area of large-scale landslides. In further study, it is necessary to increase the number of applications of this method by combining the use of DEM from LiDAR with multi-temporal aerial photograph interpretation for various micro-topography types of mass movement landforms, and a legend for applied geomorphological map is need to be created.</p>

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