Evaluation on valley health based on set pair analysis and variable fuzzy set

摘要

Evaluation on the valley health was donewith set pair analysis (SPA) making a relative membership function on variable fuzzy sets (VFS) in the paper.And evaluation indexes and connection number of evaluation grade were made with the SPA.And the valley health was evaluated with grade characteristics values of relative membership degree, which attached to ???classifying evaluation grade n??? of Fuzzy set by calculating indicators??? samples. And the evaluation results showed that the current health grade on the Zhang river was healthy, while ones on the Tangshan region in the Luan river sub-healthy.