開水路分水工の研究

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  • 室田 明
    社團法人土木學會 大阪大学, 工学部構築工学教室

書誌事項

タイトル別名
  • HYDRAULIC RESEARCHES ON THE BRANCHING WORKS OF OPEN CHANNELS
  • カイスイロ ブンスイコウ ノ ケンキュウ

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抄録

Some flow characteristics of the channel with a distributary are investigated analytically and experimentally in this report.<br>To research flow characteristics mainly in the main channel, pattern of these flows are finally reduced by means of the overlap principle to the “symmetrical out-flow”, that is, the out-flow from an openning of a channel side-wall (an orifice of a tank with the finite width and infinite length) corresponding to the junction of a distributary. These flow patterns are fundamentally calculated by conformal representations and the critical condition of the occurrence of upstream-ward back-flow and the stagnation point near the downstream corner of the openning were determined by these analyses.<br>The occurrence of the super-critical region near the upstream corner of the openning which is similar to the transonic problem in the aerodynamics is also investigated by the above-mentioned method and these characteristics are verified by our experiments.<br>We found experimentally interesting relations between the distribution ratio of tractive sand loads and of water discharge. It was recognized that tractive loads flowing into a distributary were nearly provided only by the distribution ratio of discharge and scarely any other hydraulic quantities, and also that when about half part of total discharge (the distribution ratio: κ≅50%), almost all tractive loads flowed into a distributary (the distribution ratio of loads: εg≅100%). Our tentative experimental relations between κ and εg are as shown follows.<br>1-κg=4.510 (0.530-κ)2, κ>-0.11<br>Moreover, the situation and the type of jetties near the branching part are delibarated by our experiments and the detached type jetty with a submerged mole is proposed as the most suitable one.<br>In the last chapter of this report, our field and model studies for the improvement of the intake work of the hydraulic power station are briefly mentioned.

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