Abstract:

To grasp the nutritional situation of Suyahu reservoir, combining with the evaluation criteria of the eutrophication of lake and reservoir, the eutrophic status was analyzed based on information entropy osculating method from 2009 to 2015. The results showed that the reservoir had mild eutrophication in 2012, and moderate eutrophication in the other years. By nutritional degree, the order of each year from light to heavy was 2012<2013<2015<2009<2010<2014<2011; from the perspective of linear interpolation method, the order of its nutritional degree was 2012<2015<2013<2011<2010<2009<2014; there were differences in the sorting though the outcome from the two methods were consistent, the subjectivity of linear interpolation method was more due to the discrepancy of evaluation principle and approach of index weight, information entropy osculating method could reduce the subjectivity and identify the major influencing factors, which made the evaluation result more accord with the reality. Information entropy osculating method can be used as a common method to analyze water quality of reservoirs and lakes.

Key words: osculating value method, information entropy, eutrophication, Suyahu reservoir, assessment