FUZZY COMPREHENSIVE EVALUATION OF WATER QUALITY OF JIYUN RIVER IN TIANJIN

The fuzzy comprehensive evaluation method was employed to assess the current status of water quality of dry season and wet season in the Jiyun River in Tianjin.Based on the monitoring water quality data in 2009,the evaluation factors and the weights of each factor were selected.Then the degree of membership that water quality attach to a sort of discharge level can be calculated.The results is V both in dry season and wet season which illustrated the water of the Jiyun River was seriously polluted.The results indicate that the fuzzy comprehensive evaluation method can be used to assess the status of water quality in the Jiyun River because it could represent the actual water quality situation of the Jiyun River.