Fig. 7

Photographs showing the gully of the Midori-ga-oka debris flow. Arrows point in the downstream direction. a three branches in the source area (at cross section S-0 in Fig. 5); (b) strongly weathered granite bedrock exposed by the erosion of debris flow (S-1); (c) shallow bedrock gully after erosion by the debris flow (S-2); (d) erosion along the sheeting joints in granite (C-4); (e) bedrock gully with few debris flow deposits (C-6); (f) granite bedrock gully after extreme erosion, near the bottom of the gully (S-19); (g) the bottom of the debris flow gully, where deposits of different grain size appeared and a temporary ring net countermeasure (at S-23) was finished in December 2014; (h) severely damaged residences beside the pathway of the debris flow, these houses were built on previous debris flow deposits