著者

和田 一範 岡安 徹也 市山 誠 浜口 憲一郎

出版者

Japan Society of Civil Engineers

雑誌

土木史研究論文集 (ISSN:13495712)

巻号頁・発行日

vol.24, pp.141-150, 2005-05-15 (Released:2010-06-04)

参考文献数

12

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The Shingen Embankment built about 450 years ago by Takeda Shingen on the Fuji River and the Kamanashi River was designed to control flood flows in the Midai River (tributary) and the Kamanashi River by means of a series of flood control structures including Ishitsumidashi (stone masonry groins), Shougi-gashira (Japanese chess piece-shaped flow splitters), Hokkiri (dug channel), Juroku-ishi (sixteen large rocks used as energy dissipation works), Takaiwa (natural rock wall) and Kasumi-tei (discontinuous levees). The functions of these flood control structures have been subject to various interpretations, and some of those structures and their functions, such as the functions of a number of Shougi-gashira flow splitters and details on Juroku-ishi, which can only be guessed at today, are mysterious in many ways. This paper introduces an attempt at verifying the flow control technology made possible with these flood control structures by using a table-top hydraulic model developed with the aim of explaining the hydraulic phenomena involved.

著者

市山 誠 石川 忠晴

出版者

公益社団法人 土木学会

雑誌

土木学会論文集B1(水工学) (ISSN:2185467X)

巻号頁・発行日

vol.70, no.4, pp.I_727-I_732, 2014 (Released:2015-05-18)

参考文献数

9

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This study investigated the basic hydraulic characteristics of a bending river section with a cut-off channel by flume experiment. Contents of measurements included the longitudinal profile of water surface, flow velocity in cross sections by an electromagnetic current meter, and the surface flow velocity by using PIV methods. In addition, tendency of bed sediment motion was observed by bottom tracer experiment. Installation of cut-off channel resulted in a wide dead water area at the side of divergence in the main stream and low-velocity area at the center of the confluence. The point of surface flow which attacked the bank moved upstream in the main stream of distribution. Then the secondary flow became stronger, and the direction of bottom flow was strongly skewed in a transverse direction. Moreover, the bottom tracers moved and accumulated rapidly from the outer bank towards the inner bank at the curve of distributaries downstream. It suggested the occurrence of scour and sedimentation.

著者

市山 誠 石川 忠晴

出版者

公益社団法人 土木学会

雑誌

土木学会論文集B1(水工学) (ISSN:18808751)

巻号頁・発行日

vol.70, no.4, pp.I_727-I_732, 2014

---

This study investigated the basic hydraulic characteristics of a bending river section with a cut-off channel by flume experiment. Contents of measurements included the longitudinal profile of water surface, flow velocity in cross sections by an electromagnetic current meter, and the surface flow velocity by using PIV methods. In addition, tendency of bed sediment motion was observed by bottom tracer experiment. Installation of cut-off channel resulted in a wide dead water area at the side of divergence in the main stream and low-velocity area at the center of the confluence. The point of surface flow which attacked the bank moved upstream in the main stream of distribution. Then the secondary flow became stronger, and the direction of bottom flow was strongly skewed in a transverse direction. Moreover, the bottom tracers moved and accumulated rapidly from the outer bank towards the inner bank at the curve of distributaries downstream. It suggested the occurrence of scour and sedimentation.