CAJ | 학술논문

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In order to optimize water management and water use efficiency in irrigation district ,horizontal velocity distribution char‐acteristics was analyzed in open channels flow ,based on the indoor and field experiment .The characteristic velocity of the flow layer was calculated by the exponential law .In addition ,for the vertical distribution of the horizontal mean velocity ,the two-power law was established ,and the method for defining the parameters was given .And then the surface velocity method was put forward for flow measurement ,based on the two-power law .The results showed that the predicted velocity distribution by the two power law a‐greed with the experimental data in the 0 .1~0 .95 dimensionless depth so well ,and the relative error was as small as ± 5% .In order to calculate the open channel flow ,only the surface middle point velocity and the depth of the cross section were measured in the sur‐face velocity method ,without flow disturbance and transformation of the open channel .Especially ,the workload of the flow meas‐urement by the surface velocity method was substantially reduced .