Integrated model of fuzzy analytical hierarchy process and variable fuzzy set model on evaluating river health system
In order to evaluate river's present situation and strengthen the protection and construction of the ecological environment, the evaluation index system (EIS) and evaluation grading criterions (EGO of river health were created using the weights of evaluation indexes with the fuzzy analytical hierarchy process (FAHP), and the model of variable fuzzy set (VFS) and the FAHP were integrated as the evaluation model. The FAHP-VFS model was applied to the Beijing-Hangzhou Grand Canal (Hangzhou Section). The results showed that: I)the river health grade of "Anlv" and "Jingmei" were classified into Class II "health" in the first-grade indexes of Beijing-Hangzhou Grand Canal; ii) the river health grade of "Shuiqing" was classified into Class HI "sub health"; iii) the river health grade of "Liuchang" was classified into Class TV "bad health". The overall evaluation of the Beijing-Hangzhou Grand Canal (Hangzhou Section) was recognized as "sub-health" grade and the characteristic parameter was 2. 849. The results turned out to be reliable due to the well-developed modeling process and carefully-defined physical conception. This evaluation process also provides an optional approach to health evaluation of other complicated systems.
river health evaluationfuzzy analytical hierarchy processvariable fuzzy setrelative membership grade