A Fusion Water Quality Soft-Sensing Method Based on WASP Model and Its Application in Water Eutrophication Evaluation

Table 6

RMSE values of each water quality index obtained by different methods.

Method	DO; (mg/L)	BOD; (mg/L)	NH3-N; (mg/L)	TN; (mg/L)	Chl_a; (mg/L)
Trial-and-error method	1.31	0.167	0.07	0.22	0.002
Nonlinear least squares	0.88	0.151	0.04	0.13	0.001
UKF	0.68	0.080	0.02	0.09	0.001