基于灰色关联理论-密切值法的大型灌区运行状况综合评价

Comprehensive evaluation on the operation condition of large irrigation district based on the grey relation theory-osculating value method

依据评价对象与目标最优点的灰色关联度越大,则表明评价对象与最优点的距离越近,在大型灌区运行状况综合评价时,将灰色关联法与密切值法相结合,既保存了密切值法客观性好的优点,又能合理利用灰色关联法克服密切值在贫信息情况下的缺陷。以陕西省大型自流渠灌区洛惠渠为实例进行验证,评价结果显示洛惠渠灌区在2007、2008、2009、2010、2011、2012年的密切值分别为5.1238、4.7421、3.8396、3.0147、2.4679、1.2868,运行状况级别分别为中等、中等、中等、良好、良好、良好。其评价结果与可拓评价法结果基本一致,都随着时间的推移,洛惠渠灌区评价级别从中等逐渐变为良好,运行状况越来越好,这也符合洛惠渠灌区的客观实际和发展规律,且该方法理解简单、可靠性高,为大型灌区运行状况综合评价提出了一种新方法。

The greater grey correlation between optimal point of evaluation objects and goals, the closer distance between them. When carrying out comprehensive evaluation on the operation condition of large irrigation district, grey relation method and osculating value method can be combined, both retaining good advantages in objectivity of the osculating value method and overcoming the defects of osculating value method under poor information condition through reasonable use of the grey relation method. A large-scale gravity canal Luohuiqu irrigation district in Shaanxi was then employed to validate the above hypothesis. The evaluation results showed that in years of 2007, 2008, 2009, 2010, 2011 and 2012, the osculating values in Luohuiqu irrigation district were 5. 1238, 4. 7421, 3. 8396, 3. 0147, 2. 4679, and 1. 2868, and the levels of operation conditions were medium, medium, medium, good, good, and good, respectively. The evaluation results were basically in accordance with the extension evaluation method. With time going, the evaluation level in Luohuiqu irrigation district gradually became improved and the operation condition was enhanced, which also confirmed the objective reality and the law of development in this district. This method was simple in comprehension and high in reliability, providing a new approach in overall evaluation of operational status in large-scale irrigation area.