论文部分内容阅读
前言U 形渠道在国内已广泛应用,但 U 形渠道的量水问题尚未得到满意的解决。我们针对泾惠渠灌区斗渠以下清水、浑水、冰水交替灌溉的情况,通过大量室内试验及现场测定,提出了适合 U 形渠道测流的平底抛物线形量水槽。(一)平底抛物线形量水槽的构造根据我国北方灌区渠道输沙、过冰的特点,以及量水建筑物应有的量水精度、幅度、坚固性、少壅水、工程量小等要求,提出了三种新型量水设备:平底三角形量水槽、平底 U 形量水槽和抛物线形量水槽。经过水力试验造型,以平底抛物线形量水槽为
Introduction U-shaped channels have been widely used in China, but the U-shaped channels have not yet been satisfactorily solved. Based on a large number of indoor tests and field measurements, we proposed a flat parabolic sink for U-shaped channel flow measurement in the light of the alternate irrigation of clear water, muddy water and ice water in the ditch of Jinghuiqu Irrigation District. (I) Constructions of Flat Parabolic Sinks According to the characteristics of sediment transport and icing in the channels of northern China irrigated area, as well as the accuracy, magnitude, robustness, low water consumption and small amount of water required for measuring water structures, Three new types of water equipment are proposed: a flat triangular trough, a flat U-shaped trough, and a parabolic trough. After the hydraulic test model to flat parabolic shaped volume sink