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交口抽渭灌区斗分渠的混凝土U形衬砌已有478公里,干支渠道的U形衬砌也在逐步推行。渠道U形衬砌后断面窄深,原设在引水口附近的巴歇尔量水槽,因上游行进流速加大,下游出流不畅,失去应用临界水深原理量水的条件,若进一步缩小喉道,又限制渠道输水能力,条件受到限制。因此,解决好U形渠道的量水问题,具有很现实的意义。为此,我们对各种量水设施进行了分析比较,认为三角剖面堰对解决U形渠道的量水,比较可行。从1985年开始,对三角剖面堰进行了实验验证和应用推广工作。 (一)三角剖面堰的基本情况
There have been 478 km of concrete U-shaped lining at the bucket channel in the cross-over irrigation district and the U-shaped linings of dry and branch channels have been gradually implemented. Channel U-shaped lining after the narrow section, the original set in the waters near the mouth of the Parschel flume, because of the upstream flow rate increases, the downstream flow is poor, the loss of critical water depth principle of the amount of water conditions, if further reduce the throat , But also limit the ability of channel water transport, conditions are limited. Therefore, to solve the problem of measuring the amount of water in the U-shaped channel has very realistic significance. To this end, we conducted a variety of water facilities were analyzed and compared, that the triangular profile weir U-shaped channel to solve the amount of water, more feasible. From 1985 onwards, the triangular profile weir has been experimentally verified and applied to promote work. (A) The basic situation of the triangular profile weir