Characteristics of Debris Flow that Occurred in the Slope Where It was not Recognized that Sediment Disasters may Occur during Heavy Rains in West Japan in July 2018 = Characteristics of Debris Flow that Occurred in the Slope Where It was not Recognized that Sediment Disasters may Occur during Heavy Rains in West Japan in July 2018

다국어 초록 (Multilingual Abstract)

A heavy rainfall in July 2018 caused sediment disasters in West Japan. In this disaster, some debris flow were occured on slopes that were not recognized the potential of the occurence of sediment disasters.
In this report, based on the results of the sediment disaster emergency survey conducted in several cities in West Japan, we will report the distribution and examples of slopes where these disasters occurred. In addition, regarding the occurrence of debris flow, the features related to topography and weather were examined.
In Japan, the hazards of sediment disasters are recognized based on whether the topography of the slope has the same conditions as the topography of sediment disasters that occurred in the past. In this report, we focused on the debris flow occured on the slope that was not recognized as a valley where the debris flow occurs(the valley depth is wider than the valley width).
As a result of this survey, we were able to understand the characteristics of the debris flow that occurred at a slope that was not recognized dangerous of sediment disaster.
We believe that this report will help improve the warning and evacuation system for future sediment disasters in Japan.