A comprehensive model for assessing lake eutrophication

Abstract

Abstract: The evaluation of eutrophication or trophic state of a lake is in fact a multivariate comprehensive decision making process quantifying the qualitative problem. Therefore,we should use a comprehensive method to assess lake eutrophication. On the basis of summarizing some comprehensive methods for assessing lake eutrophication reported in China and abroad,it is pointed out that the trophic state index (TSI) should be a major method for evaluating lake eutrophication, since it could provide a continuous numerical class of lake trophic state and a rigorous foundation of quantitative studies of eutrophication mechanism. Using analytic hierarchy process (AHP) to determine the weight attributions in the selected comprehensive indices,the authors,constructed a comprehensive assessment model as: TSI=W(Chla)?TSI(Chla)+W(Sd)?TSI(Sd)+W(TP)?TSI(TP) or TSI_M=W(Chla)?TSI_M(Chla)+W(Sd)?TSI_M(Sd) +W(TP)?TSI_M(TP) where W(X) were the weights for the above three parameters with value in percentage as 54.0,29.7 and 16.3,respectively. Additionally,the relations between comprehensive evaluation and other statistical methods such as cluster analysis were briefly discussed.

Key words: Eutrophication, Trophic state index, Comprehensive evaluation, Analytic hierarchy process

CLC Number:

X826

Qinghua CAI, Jiankang LIU, Lorenz King. A comprehensive model for assessing lake eutrophication[J]. Chinese Journal of Applied Ecology, 2002, (12): 1674-1678.

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