Abstract:

【Objective】 Inflow cutoff is one of the basic technical parameters in the design and management of surface irrigation system. The control error of inflow cutoff can affect the evaluation and management of surface irrigation system. In this paper, the control error and its effect on border irrigation performance were studied. 【Method】According to the control error of different inflow cutoff under 16 border strips, the statistical characteristics were acquired with the classical statistical theory, and the effect of control error on irrigation performance was simulated by SRFR model.【Result】Results indicate that the variation intensity of control error of inflow cutoff is strong, the effect of inflow cutoff on distribution uniformity is visible than application efficiency.【Conclusion】Therefore the control error of inflow cutoff is not ignored in the actual design and management of surface irrigation. Bigger inflow rate can reduce the effect of control error of inflow cutoff on irrigation performance.