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Flow Control by the Hanaguri Channel, a Monumental Irrigation Work by Kiyomasa Kato

Author(s): Terunori Ohmoto; Hajime Ito

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Keywords: Monumental irrigation work; Volcanic ashes; Wall jet

Abstract: The Hanaguri channel is known as mysterious-shaped structures, which was constructed in the Nakasu mountain in Kumamoto Prefecture, Japan, to irrigate a paddy field in the middle reach of Shira river basin by Kiyomasa Katou in 1608. In this study, a field investigation and a model experiment were carried out to grasp the actual status and hydraulic functions of the Hanaguri channel. The results showed that the Hanaguri channel had 26 walls with a semicircular hole which was dug in the lower part of the wall, and the flow between the walls exhibited the characteristics of wall jet and had enough tractive force to transport volcanic ashes erupted from the Mt. Aso.

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Year: 2007

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