滞砂防除に関する土砂水理学的研究 (第5報) : 渦動管土砂吐工の効果について

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The Amagawa driving channel was built in 1958 to induce irrigation water to Manno reservoir from rivers nearby. However, a notable accumulation of large diameter sand was seen due to restrictive conditions in taking water from the Doki river, the location of head works, improper structure and state of river mainten ance. From this point of view three types of hydraulic model experiments were carried out in order to set up an improvement plan to make it possible to take in water up to the maximum level of Q_p=8.0m^3/sec while preventing and trapping the sand even at the time of high water level. Effective and proper result was obtained from the above experiments and an improvement enforcement plane was decided upon. First, concerning the hydraulic model experiment (reduced scale 1/10) on the trapping effect of the automatic hydranlic shutter, basic studies were carried out using a channel of 20 meters in length on the gate operation and trapping capacity in the previous paper. Next, in carrying, cut a hydraulic model experiment (reduced scale 1/10) concerning the scouring sluice in the Amagawa driving channel, a model of the existing channel which extends to about 100 meters was built. Vortex tube sand traps were newly placed at two locaions, it was ascertained that it was possible to almost completely trap the sand while taking in water regardless of the quantity of water being taken in. The use of automatic special gate of vortex tube (oil pressure and remote control system) was proposed in order to assist the enhancement of sand trapping efficiency and prevent the flow-in of large diameter sand. Next, in carrying out a hydraulic model experiment (reduced scale 1/40) concerning measures to prevent and trap sand accumulation in Amagawa head works, a 1/40 scale model of the original, which extends about 400 meters, was built. An overall experiment was conducted using this model. As the result proposed final plan No. 1 and No. 2 in the previous paper. Next, in adopting the improvement enforcement plan Kagawa Prefectural Authorities were consulted concerning the particular local situation and tentatively decided to partly revise the improvement No. 1 as the final plan (to increase the height of existing intake weir, newly establish three automatic hybraulic shutters in the existing sand diversion weir, change the scouring sluice in the sedimentation basin with vortex tube sand trap No. 1 and newly establish vortex tube sand trap No. 2 in the approach channel). Finally, concerning the model investigation and prototype conformity, functional observations were carried out using the actual scouring sluice and vortex tube sand trap on the gate and trapping capacity. The agreement between hydraulic model experiments and prototype results was very good.
神戸大学の論文

滞砂防除に関する土砂水理学的研究 (第5報) : 渦動管土砂吐工の効果について

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