Water Quality Modeling in Reservoirs Using Multivariate Linear Regression and Two Neural Network Models

Table 2

The correlation coefficient () between individual dependent variable and DO, TP, Chl a, and SD.

Variables	value between dependent variable and DO	value between dependent variable and TP	value between dependent variable and Chl a	value between dependent variable and SD
Water temperature (WT)	0.2025	0.0861	0.3642	0.0571
pH	0.6339	0.2401	0.4090	0.0765
Electrical conductivity (EC)	0.0890	0.1769	0.0938	0.2164
Turbidity (TB)	0.0715	0.3505	0.0003	0.2140
Suspended solids (SS)	0.0812	0.3505	0.0094	0.2394
Total hardness (TH)	0.0289	0.0145	0.1051	0.1989
Total alkalinity (TA)	0.0250	0.0239	0.0488	0.1707
Secchi disk depth (SD)	0.0062	0.0982	0.0916	—
Dissolved oxygen (DO)	—	0.1917	0.3963	0.0062
Chlorophyll a (Chl a)	0.3963	0.0453	—	0.0916
Total phosphorus (TP)	0.1917	—	0.0453	0.1080
Nitrate nitrogen (NO3)	0.1763	0.1740	0.1410	0.0978
Biochemical oxygen demand (BOD)	0.1199	0.0507	0.1777	0.0528