長野県西部地震による鈴ヶ沢土石流 : 堆積・流下状況について

概要

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The Suzugasawa is a tributary of the Ohtaki River and its watershed area is about 24 square kilometers. Debris flow of the Suzugasawa had been occurred when debris flow of the Denjo River had entered into the headwaters of the Suzugusawa beyond a ridge of the Komikasa Mountain. Debris flow movement is very complex mechanisms because many factors affecting each other are contained, therefore the collection of debris flow data based on field observation is a significant task from the point of view of debris flow elucidation. Circumstances of debris flow deposition have been made an intensive investigation in the reaches, where the distance of between the Suzugasawa Bridge and the cascade of headwaters is about 3 kilometers. On the velocity of debris flow, debris flow traces on a steep slope in the bend reaches were measured by means of a land survey and the velocity was calculated using Lenau's equation. It turned out that the velocity of debris flow is about 8-14 m/s, and this estimated value is reasonable in comparison with other debris flow velocity based on field observation.
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