Multidimensional Connection Cloud Model Coupled with Improved CRITIC Method for Evaluation of Eutrophic Water

Table 1

Classification standard of water eutrophication [52].

Classification	Chl-a (mg/m^3)	TP (mg/m^3)	TN (mg/m^3)	CODMn (mg/L)	SD (m)
I	≤1.0	≤2.5	≤30	≤0.3	≥10.0
II	≤2.0	≤5.0	≤50	≤0.4	≥5.0
III	≤4.0	≤25	≤300	≤2.0	≥1.5
IV	≤10	≤50	≤500	≤4.0	≥1.0
V	≤64	≤200	≤2000	≤10	≥0.4
VI	>64	>200	>2000	>10	<0.4