Application of combined fuzzy Borda method for evaluation of rural drinking water safety of Lang County in Nyingchi City
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Abstract:
Comprehensive pollution index and principal component analysis ( PCA ) method were used to perform water safety evaluation based on drinking water sources obtained from 18 villages of Lang County in Nyingchi City. In order to avoid the influence of weight assignment on single evaluat ion method, two methods were used by combining the evaluation method based on Fuzzy Borda. The results sho wed that the combined evaluation method based on Fuzzy Borda had higher discrimination comparedto comprehensive pollution index and principal component analysis method. Results revealed that comprehensive pollution index assessment, PCA , combined evaluation method based on Fuzzy Borda had similar trend. The higherSpearman coefficient and Kendall correlation coefficient had also proven that the fuzzy Borda method was a feasible option for rural drinking water safety assessment. The results of drinking water safety evaluation assessment in 18 villages showed that the drinking source of villages such as Bangma, Tomai, Chongkang, Dui, Zhuo, Laiyi, Lie, Xiu, Zhaxitang, Jie, Niang , Kangma, Gagong, Dongxiong , Dorong, Remi, Lado and Sangmuin was turned decreasing gradually.
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