基于稳健设计理论的畦灌质量敏感性分析

Sensitivity analysis of border irrigation performance using robust design theory

针对畦灌系统运行管理水平和灌水质量较低的问题,该文应用稳健设计的基本理论,结合地面灌溉SRFR模拟模型,评价了畦田的灌水质量,模拟了单宽流量和入渗参数对灌水质量的影响,分析了灌水质量对各因素的敏感性。结果表明,对某一固定的畦田,单宽流量并非越大越好,单宽流量在4～7L/(s·m)时,畦灌可以获得较高的灌水效率和灌水均匀度。灌水均匀度对入渗参数的敏感程度要大于灌水效率,灌水质量对入渗指数的敏感性大于入渗系数,增加单宽流量能够降低灌水质量对入渗参数的敏感程度。对灌水质量影响较大的因素依次为单宽流量、入渗指数和入渗系数,贡献率分别为23.81%、20.74%和13.91%。因此,在地面灌溉的设计和管理中,应充分重视单宽流量及土壤特性参数对灌水质量的影响。

Because of poor border irrigation performance and its operation management,the author used robust design theory and surface irrigation simulation model SRFR to evaluate the irrigation performance,to simulate the effect of inflow rate and infiltration parameters on irrigation performance,and to determine the contribution rate of influence factors on irrigation performance. The results indicated that irrigation performance was not continuously improved as the inflow rate increased for a given border strip. The irrigation could get a high performance when the inflow rate was 4 to 7 L/（s·m） . Specifically,irrigation uniformity was more sensitive to infiltration parameters than irrigation efficiency,irrigation performance was more sensitive to infiltration index than to infiltration coefficient,and increasing the inflow rate could reduce the influence of infiltration parameters on irrigation performance. The most important influence factors on border irrigation performance（contribution rate） were inflow rate（23.81%） ,infiltration coefficient（20.74%） and infiltration index（13.91%） . Therefore,inflow rate and infiltration parameters should be given full attention in surface irrigation design and management.