合流および湾曲部における水制工の影響と乱れに関する実験的研究

概要

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The objective of this study is to clear the effects of spur dikes on steam by means of hydraulic model experimental. In the experiment, Seigyu groins were set at the confluence of a river and at a curve. In addition for comparison training jetty and cross dyke were set up in the river channel. We studied hydraulic characteristics on the basis of the result. The results shows that a Seigyu, like a training jetty, divides flow into two at a confluence, and shifts the core of flow at a curve. A Seigyu can control a stream, but lower discharge capacity because placement of a Seigyu or cross dike narrows cross section area. Consequently, water level upstream rises. Drag coefficient C_D, an index of resistance characteristics of a Seigyu groins, amounts to nearly 1, the same as for a cylinder. Roughness coefficient n is 1.1 or 1.25 time that found when Seigyu groin are not provided. Further, analysis of turbulence flow revealed instantaneous and minute streams in around Seigyu groin.
2003-03-27