梯形槽中三角剖面堰测流特性研究

研究梯形槽中三角剖面堰的测流特性，首先导出了梯形槽三角剖面堰的流量公式，而后通过不同边坡不同情况下的系列试验，给出了这种堰型自由流流量系数及淹没流折减系数的变化规律、推荐作用值及相应的不确定度，并从理论上予以阐释及论证；最后提出了由实测水头直接计算流量的流速系数法，可免除反复试算的麻烦。

The Flow Measurement Performance of Triangular Profile Weirs in Trapezoidal Channels

he flow measurement performance of the triangular profile weirs in trapezoidal channels have been investigated in this paper.By plenty of experimental works,for the channels with different side slopes and the triangular profile weirs under different circumstances,the variation rules,the recommended values,the recommended values and the relevant uncertainties of modular free now coeffcients and of drowned flow reduction factors are given.Furthermore,these are all expounded in the view point of theory,Finally,this paper provides the velocity coefficient method which enables discharge to be calculated directly from gauged head and be free of iterative procedures.