薄层水流水力特性试验研究

对粘砂床面的薄层水流进行定床试验,研究了不同流量、坡度下薄层水流的水力学参数(流态、水深、流速及阻力系数)随坡度和流量的变化规律。结果表明:水流雷诺数Re随着坡度和流量的增大而增大,但Re主要是由流量决定的,坡度对Re的影响不大,水流流态基本上在过渡流区和紊流区;平均水深-单宽流量,流速-单宽流量,水流阻力系数-单宽流量均成很好的幂函数形式,平均水深和流速均随单宽流量的增大而增大,阻力系数随着单宽流量的增大而减小。

Based on indoor fixed-bed experiment of overland flow,the relationships between hydraulic properties(Reynolds number,flow velocity,water depth and resistance coefficient) and discharge,slope gradient is examined by simulating in a resistant flume,on which a kind of sand(1~2 mm) was fixed.The results show that: ①the Re number of overland flow increase with the increasing of discharge and slope gradient.However,the effect of discharge is more greater than that of slope gradient.②the average velocity and water...