宽顶堰平板压差式量水闸过流规律

灌区水量的测量问题正日益受到关注。对于平原灌区，研究利用以淹没出流为主的工作闸门进行渠道量水具有现实意义。基于孔板式流量计的测流原理，提出一种平板压差式量水闸门。选择不同闸门开度e与闸门上游水深H组合，通过室内试验研究分析了闸孔淹没出流的相关测流规律，得出实用的流量系数经验公式。结果表明，该型闸门结构简单，取压方便，量水精度较高，集水位流量调控与测量为一体，适合应用于平原灌区。

Research on Laws of Overflowing of Slab Pressure-Difference Sluice for Flow Measurement on Broad-Crest Weir

Irrigation district water measuring arises more and more attention increasingly. It has realistic significance to research on using working gate with submerged discharge to measure water in canal for slab irrigation district. This paper presents a particular kind of slab pressure-difference sluice based on flow measurement principle of orifice-plate flow meter. Laboratory experiments are conducted to analyze flow measurement laws related to discharge-submerged sluice by choosing different combinations of gate openings e and upstream water depths H, and empirical formulae of discharge coefficient are recommended. The results show that this sluice has advantages including simplicity in structure, convenience in pressure-difference measuring, and high accuracy in discharge measuring; furthermore, the technique integrates water level and discharge regulation and measurement processes, and it is suited for application in plain irrigation districts.