Field Observation of Roll-waves in Debris Flow

by Makoto Hikida, Kagoshima Nat'l Coll of Tech., Kagoshima, Japan,

Document Type: Proceeding Paper

Part of: Hydraulics/Hydrology of Arid Lands (H²AL)


In 1979, the observatory of debris flow was set up in the Hase River of Mt. Sakurajima in Japan which is one of the most active volcanoes in the world. Obvious roll-waves on each debris flow have been observed through the use of a VTR system. The wave velocity, period and profile of the roll-wave, etc. are obtainable by the analysis of the video tapes. In this paper, the equipment, its use, and the measurement techniques used at the observatory are described. The values computed by the data presented here show fairly good agreement with the ones observed.

Subject Headings: Debris | Solids flow | River flow | Wave velocity | Water waves | Wave measurement | Rivers and streams | Computer vision and image processing | Japan | Asia

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