畦灌改水成数的控制误差及其对灌水质量的影响

Control Error of Inflow Cutoff and Its Effect on Border Irrigation Performance

改水成数是地面灌溉设计和管理的基本参数之一。为了更好地进行地面灌溉系统的设计和管理,统计了畦灌改水成数的控制误差,并分析了其对灌水质量的影响。根据实测的16条畦田不同改水成数的控制误差,采用经典统计学方法得到了其统计特征,并采用地面灌溉模拟模型SRFR评价了其对灌水质量的影响。结果表明,改水成数控制误差具有较强的变异性,改水成数对灌水均匀度的影响大于灌水效率。因此,在实际地面灌溉设计与管理中,改水成数的控制误差不可忽略。较大的单宽流量有助于减小改水成数的控制误差对灌水质量的影响。

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.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.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.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.