摘要
巴歇尔量水槽是一种通过明渠收缩段来量水的量水槽。试验在底宽0.3 m、深0.5 m、边坡系数为1的梯形渠道中设计了喉道宽0.25m的标准巴歇尔量水槽进行。试验完成了14组不同流量下的水位、水面线和量水槽上下游16个断面的流速量测。拟合出自由流和淹没流条件下水深-流量公式及上游水深与巴歇尔槽水头损失关系,对不同流量下佛汝德数沿渠身各控制断面的变化情况做了分析,从而可确定出临界水深断面位置,最后对大、中、小三个流量下的冲沙情况做了介绍。
Parshall flume is a kind of flume, which measures water through contraction section on the open channel. This experiment was carried out on a standard Parshall flume with a 0. 25m width throat, which emplaced in a trapezoidal channel with 0. 3m bottom width, 0.5m depth and 1 of the factor of slope. The experiment measures water surface curves and velocity of 16 cross sections from upstream to downstream for 14 different discharges. The formula of depth with discharge both under the free flow and submerged flow, and the relation between upstream depth and the head losses of Parshall flume are fitted out. This paper also introduces the changes of Froude number along the control sections under different discharges, the condition of sand flushing under small, middle and large discharge.
出处
《节水灌溉》
北大核心
2009年第12期45-47,共3页
Water Saving Irrigation
