基于熵权TOPSIS法的灌溉用水效率评价

Evaluating Irrigation Water Efficiency Using Entropy Weight-TOPSIS Method:A Case Study

【目的】对灌区灌溉用水效率进行评价,为灌区节水改造提供科学依据。【方法】通过构建灌溉用水效率综合评价指标体系,基于熵权TOPSIS法对2017—2020年新疆兵团第二师6个灌区的灌溉用水效率进行评价。【结果】熵权TOPSIS法的评价结果与灌区实际情况相符,评价结果排序与灌溉水有效利用系数排序、AHP—模糊综合评价结果排序均具有显著相关性,且熵权TOPSIS法相比AHP—模糊综合评价法的变异系数更大,更有利于灌区灌溉用水效率的等级划分;根据灌区各评价指标等级与灌溉用水效率综合评价等级之间的差异,确定了灌溉用水效率的主控因素。【结论】基于熵权TOPSIS法的灌溉用水效率评价具有可行性,灌区在节水改造建设的同时,应确定合理的灌溉制度,提高灌溉用水效率,建设现代化高效节水灌区。

【Objective】Improving irrigation water use efficiency is critical to developing water-saving agriculture.The aim of this paper is to present and validate a model to comprehensively evaluate irrigation water use efficiency.【Method】The model is based on the entropy-weighted technique for order of preference by similarity to ideal solution(TOPSIS),using the evaluation indexes constructed from irrigation water efficiency.We then applied it to evaluate water use efficiency from 2017 to 2020 in six irrigation areas in the Second Division of Xinjiang Production and Construction Corps.【Result】The results calculated from the model are consistent with the ground-truth data.The rank of the results calculated from the model is closely correlated with the rank of the effective utilization coefficient of the irrigation water and the rank of the results calculated from the AHP-fuzzy comprehensive evaluation(P<0.01).The coefficient of variation of the entropy-weighted TOPSIS method is larger than that of the AHP-fuzzy evaluation,and the former is hence more reliable for calculating irrigation water efficiency.The factors influencing irrigation water efficiency in each area can be determined based on the difference between the evaluation indexing grade and the comprehensive evaluation grade of the irrigation water efficiency.【Conclusion】The entropy-weighted TOPSIS method is reliable for evaluating irrigation water efficiency.It has potential for helping develop water-saving irrigation systems for the studied region and regions with similar conditions.