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Debris flows usually occur in steep mountain channels and can be extremely\udhazardous as a result of their destructive power, long travel distance, and\udhigh velocity. However, their characteristics in the initiation zones, which\udcould possibly be affected by temporal changes in the accumulation conditions\udof the storage (i.e., channel gradient and volume of storage) associated with\udsediment supply from hillslopes and the evacuation of sediment by debris\udflows, are poorly understood. Thus, we studied the relationship between the\udflow characteristics and the accumulation conditions of the storage in an\udinitiation zone of debris flow at the Ohya landslide body in Japan using a\udvariety of methods, including a physical analysis, a periodical terrestrial\udlaser scanning (TLS) survey, and field monitoring. Our study clarified that\udboth partly and fully saturated debris flows are important hydrogeomorphic\udprocesses in the initiation zones of debris flow because of the steep\udterrain. The predominant type of flow varied temporally and was affected by\udthe volume of storage and rainfall patterns. Fully saturated flow dominated\udwhen the total volume of storage was  <  10 000 m<sup>3</sup>, while partly saturated\udflow dominated when the total volume of the storage was  >  15 000 m<sup>3</sup>. Debris\udflows form channel topography which reflects the predominant flow types\udduring debris-flow events. Partly saturated debris flow tended to form\udsteeper channel sections (22.2–37.3°), while fully saturated\uddebris flow tended to form gentler channel sections ( <  22.2°).\udSuch relationship between the flow type and the channel gradient could be\udexplained by a simple analysis of the static force at the bottom of the\udsediment mass

Relationship between the accumulation of sediment storage and debris-flow characteristics in a debris-flow initiation zone, Ohya landslide body, Japan