Application of five-element connection number on the comprehensive impact evaluation of water-saving renovation in irrigation area

Set pair analysis method with five-element connection number was applied for a comprehensive evaluation of the beneficial effect of water-saving renovation in irrigation area. Taken inland irrigation area in the Yellow River, Huai River and Hai River region as an example, according to their characteristics in economic, social, cultural and environmental aspects etc., the index system for a comprehensive evaluation of the beneficial effect from the water-saving project was initially established. The relative membership function was constructed by Set Pair Analysis based on five-element, where the value of evaluation index of combined effects of water-saving renovation belongs to the variable fuzzy sets 5 grades of standard evaluation criteria for the combined impact of water-saving renovation in irrigation area. The case study is carried out in Huang-Huai-Hai irrigation area for a comprehensive impact evaluation of water-saving renovations. Results show that this evaluation method is simple, reliable and the conclusion is reasonable and practical, which indicates that this method is feasible for the comprehensive evaluation of the impact of water-saving renovation and can provide theoretical basis for water-saving management in irrigation area.