APPLICATION OF FUZZY COMPREHENSIVE EVALUATION METHOD ON NORMAL SAMPLES IN WATER QUALITY ASSESSMENT IN CHAOHU LAKE

To overcome the subjective factors of fuzzy comprehensive evaluation applied in water quality，the water quality indexes were assumed to be normal-distributed random variables，then the probability was introduced and a practical membership function was constructed． The method with the new function was sensitive to show a distinct difference in the comprehensive water quality of different time or waters by calculating a comprehensive pollution index． By researching 9-year water quality on Hefei section of Chaohulake，the method is proven to be effective．