畦灌灌水技术参数的多目标模糊优化模型

Multi-objective fuzzy optimization model for border irrigation technical parameters

为了提高畦田灌水质量和高效用水,采用田间水利用系数的数值模拟模型求解田间水利用系数和灌水均匀度,以两者为目标建立了畦灌灌水技术参数的多目标优化数学模型.分析了该优化问题的模糊性,提出了模型的模糊解法.利用所建立的多目标模糊优化模型和计算方法,对试验畦田进行了灌水技术参数的优化计算.根据优化计算所确定的灌水技术参数,即单宽流量和灌水时间,进行田间灌水试验,测定和计算了田间水利用系数和灌水均匀度,并与优化计算的目标值进行了比较.结果表明,实测值与计算目标值有较好的一致性.因此,所提出的灌水技术参数优化模型及解法,可同时满足节水与保证灌水质量的要求.

To improve irrigation effect and water use highly,field application efficiency and water distribution uniformity were calculated using field application efficiency numerical simulation model.Regarded this two factors as object,the multi-objective optimization model for border irrigation technical parameters was established.The fuzzy relation was analyzed and fuzzy solution was presented.Based on this,irrigation technical parameters of test borders were optimized using established numerical simulation model,and irrigation experiments were conducted on computed unit discharge and water supply time,and field application efficiency and water distribution uniformity were computed by measured data.Field application efficiency and water distribution uniformity between measured values and optimized-objective values were compared.The results show that the measured values are in accordance with optimized-objective values.It shows that this optimization model and its solution can satisfy the demand of water-saving and guarantee for irrigation effect simultaneously.