Verification of microtopographic features of landslide or non-landslide area in Typhoon Talus in 2011

Abstract

  The 2011 Typhoon Talus caused slope damage in the Kii Peninsula. This study reviews the landslide indicators and determines the microtopography of 38 areas affected by landslides caused by the typhoon along with 63 unaffected areas. Results indicate that the areas associated with collapse have gravitationaldeformation, exhibiting end collapses with high probabilities. These topographic combinations are characterized by gravitational creep, such as the appearance of the main scarp on the earth's surface in areas characterized by surface ruptures. In the landslide development stage, these microtopographies relate to a transitional stage recognized as a change in gravity prior to initial fluctuation and can be classified into two periods depending on their frequency. Although these factors are limited to specific meteorological conditions, topography, and geological structures, they can be used to effectively forecast slope damage in areas with existing high-precision DEM data.