Figure 1
Figure 2
Results of principal component analysis for Ikizcetepeler Reservoir
| Variables in | Standardized weight of variables in selected PC (tik; i = 1, 2, …, 16 and k = 1, 2, 3, 4, 5) | Loading of variables (vik) | Communalities | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 1 | 2 | 3 | 4 | 5 | 6 | ||
| pH | –4.36 | 7.67 | 3.30 | 3.93 | 4.09 | 4.98 | 0.02 | 0.24 | 0.11 | 0.12 | 0.33 | 0.13 | 0.69 |
| SO4 | –5.16 | –4.87 | 14.36 | 16.21 | 3.01 | 4.71 | –0.01 | –0.09 | 0.28 | 0.32 | 0.00 | 0.06 | 0.63 |
| ORP | –1.26 | –1.26 | 1.06 | –2.48 | 1.97 | –0.22 | –0.13 | –0.11 | 0.09 | –0.22 | 0.07 | 0.17 | 0.57 |
| Secchi | –0.08 | –0.93 | –1.92 | 2.23 | –3.77 | –0.22 | –0.03 | –0.09 | –0.19 | 0.22 | 0.33 | –0.37 | 0.74 |
| Temp | 3.55 | 1.86 | –3.35 | 3.09 | 0.89 | 0.85 | 0.24 | 0.08 | –0.15 | 0.14 | –0.09 | 0.04 | 0.86 |
| Chl | 0.33 | 0.34 | 0.42 | –3.05 | 4.21 | 0.42 | 0.08 | 0.03 | 0.04 | –0.33 | –0.01 | 0.46 | 0.74 |
| TN | 3.41 | –2.59 | 0.83 | –0.81 | 0.05 | 0.019 | 0.19 | –0.14 | 0.04 | –0.04 | –0.02 | 0.03 | 0.73 |
| NO3 | 2.49 | –4.29 | 5.07 | –1.13 | 1.41 | 2.39 | 0.17 | –0.15 | 0.18 | –0.04 | 0.31 | 0.05 | 0.93 |
| NO2 | –1.84 | –0.92 | 7.68 | 4.44 | 2.15 | 0.53 | –0.05 | –0.03 | 0.31 | 0.17 | –0.35 | 0.08 | 0.74 |
| NH4 | 1.76 | –3.14 | 4.44 | –0.58 | –0.13 | 1.55 | 0.17 | –0.16 | 0.22 | –0.03 | 0.27 | –0.07 | 0.94 |
| TP | 0.71 | 4.77 | 0.67 | –2.61 | –2.28 | 0.45 | 0.07 | 0.29 | 0.04 | –0.16 | 0.06 | –0.14 | 0.72 |
| PO4 | 0.59 | 4.99 | 1.70 | –1.96 | –2.32 | 0.54 | 0.06 | 0.29 | 0.09 | –0.11 | –0.02 | –0.13 | 0.69 |
| Cond | 5.31 | –2.67 | –5.70 | 0.68 | 1.03 | –0.82 | 0.18 | –0.11 | –0.23 | 0.02 | –0.11 | 0.04 | 0.82 |
| TSS | –0.39 | –0.84 | –3.54 | –1.12 | 2.96 | –0.11 | –0.04 | –0.07 | –0.30 | –0.09 | 0.24 | 0.25 | 0.58 |
| BOD | –0.67 | 0.13 | –1.17 | 2.36 | 3.58 | 0.72 | 0.01 | 0.02 | –0.16 | 0.32 | –0.07 | 0.48 | 0.71 |
| TDS | –2.34 | 1.21 | 0.48 | 1.68 | 2.49 | 1.37 | –0.15 | 0.13 | 0.05 | 0.18 | 0.36 | 0.27 | 0.72 |
| COD | –0.67 | 0.13 | –1.17 | 2.36 | 3.58 | 0.72 | 0.01 | 0.02 | –0.16 | 0.32 | –0.07 | 0.48 | 0.71 |
Descriptive statistics of PCs for Çaygören Reservoir
| Principle component | Eigenvalue | Cumulative variance (%) |
|---|---|---|
| PC1 | 4.0 | 23.8 |
| PC2 | 2.2 | 36.8 |
| PC3 | 1.8 | 47.7 |
| PC4 | 1.3 | 55.8 |
| PC5 | 1.2 | 63.4 |
| PC6 | 1.0 | 69.4 |
| PC7 | 0.9 | 75.1 |
| PC8 | 0.8 | 79.7 |
| PC9 | 0.7 | 83.7 |
| PC10 | 0.6 | 87.4 |
| PC11 | 0.5 | 90.3 |
| PC12 | 0.4 | 92.6 |
| PC13 | 0.3 | 94.6 |
| PC14 | 0.3 | 96.3 |
| PC15 | 0.3 | 97.8 |
| PC16 | 0.2 | 99.1 |
| PC17 | 0.15 | 100 |
Results of regression analysis (n = 16) with all PCs for Ikizcetepeler Reservoir
| Included independent variables | Regression coefficient (bk) | Standard deviation of bk | t | P | R2 (%) |
|---|---|---|---|---|---|
| Constant | 1.06 | 0.15 | 6.97 | 0.004 | 80.3 |
| Score 1 | 0.57 | 1.2 | 1.97 | 0.049 | |
| Score 12 | –5.81 | 1.72 | –3.39 | 0.042 |
Results of regression analysis (n = 17) with six PCs for Ikizcetepeler Reservoir
| Included independent variables | Regression coefficient (bk) Standard error of bk | Standardized regression coefficient | t P | R2 (%) |
|---|---|---|---|---|
| Constant | 1.01 0.18 | 5.55 0.00 | 75 | |
| Score 1 | 1.90 0.89 | 0.501 | 2.95 0.048 |
Results of principal component analysis for Çaygören Reservoir
| Variables in | Standardized weight of variables in selected PC (tik; i = 1, 2, …, 16 and k = 1, 2, 3, 4, 5) | Loading of variables (vik) | Communalities | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 1 | 2 | 3 | 4 | 5 | 6 | ||
| pH | –0.49 | –0.06 | –0.45 | 4.88 | –1.61 | –0.74 | 0.03 | –0.05 | 0.04 | 0.48 | –0.05 | 0.01 | 0.73 |
| SO4 | 2.21 | –3.48 | 3.37 | –2.60 | –0.93 | 2.45 | –0.12 | 0.04 | 0.32 | –0.15 | –0.02 | 0.25 | 0.73 |
| ORP | 1.21 | –1.93 | –0.44 | 0.91 | 1.27 | 1.80 | 0.07 | –0.28 | –0.02 | 0.05 | 0.07 | 0.16 | 0.49 |
| Secchi | –1.11 | –0.88 | –2.46 | 0.62 | 4.53 | –0.42 | 0.03 | 0.02 | –0.08 | 0.19 | 0.57 | 0.11 | 0.75 |
| Temp | 4.51 | 1.61 | –2.32 | –0.89 | 0.89 | –0.71 | 0.29 | –0.34 | –0.08 | –0.03 | 0.09 | 0.01 | 0.85 |
| Chl | –0.17 | 2.74 | 0.03 | 2.81 | –4.51 | 0.97 | –0.04 | 0.06 | –0.02 | 0.29 | –0.57 | 0.08 | 0.78 |
| TN | –1.65 | 3.43 | 1.01 | –1.37 | –1.86 | –0.64 | –0.04 | 0.36 | 0.12 | –0.02 | –0.05 | 0.02 | 0.71 |
| NO3 | –2.21 | 1.12 | –2.65 | 3.01 | 0.45 | –1.26 | –0.05 | 0.34 | –0.09 | 0.36 | 0.16 | 0.02 | 0.61 |
| NO2 | –4.48 | 6.69 | –0.69 | 2.42 | 0.95 | 0.21 | –0.31 | 0.04 | –0.09 | 0.09 | 0.01 | –0.03 | 0.85 |
| NH4 | –1.95 | 0.97 | –0.82 | 0.34 | –0.19 | –1.99 | –0.18 | 0.44 | –0.03 | 0.05 | 0.04 | –0.11 | 0.78 |
| TP | 0.21 | –0.24 | 2.62 | 1.07 | –0.31 | –4.57 | –0.04 | 0.02 | 0.12 | 0.03 | –0.08 | –0.44 | 0.61 |
| PO4 | –0.06 | –0.03 | 4.59 | –1.92 | –1.41 | –1.80 | 0.06 | 0.04 | 0.38 | –0.06 | –0.06 | –0.05 | 0.59 |
| Cond | 2.13 | –1.42 | –2.28 | –3.55 | 1.38 | 2.37 | 0.12 | –0.02 | –0.17 | –0.23 | 0.07 | 0.13 | 0.68 |
| TSS | –1.37 | –3.11 | 4.01 | 1.65 | –2.42 | 0.52 | 0.02 | 0.01 | 0.31 | 0.18 | –0.03 | 0.12 | 0.45 |
| BOD | 3.19 | –4.30 | 2.25 | –2.31 | 0.54 | –0.63 | 0.31 | –0.07 | 0.25 | –0.01 | 0.16 | 0.09 | 0.81 |
| TDS | –0.73 | –1.08 | –0.04 | –0.97 | –1.29 | 4.73 | 0.05 | –0.14 | 0.13 | 0.02 | –0.09 | 0.68 | 0.71 |
| COD | 3.42 | –1.72 | 0.15 | 1.21 | –3.67 | 0.59 | 0.25 | –0.18 | 0.01 | 0.09 | –0.25 | 0.05 | 0.72 |
Results of regression analysis (n = 17) with six PCs for Çaygören Reservoir
| Included independent variables | Regression coefficient (bk) | Standard error of bk | Standardized regression coefficient | t | P | R2 (%) |
|---|---|---|---|---|---|---|
| Constant | 1.2 | 0.34 | 3.73 | 0.002 | 71 | |
| Score 3 | 1.32 | 0.75 | 0.4 | 2.56 | 0.05 |
Residual statistics (n = 17) for Ikizcetepeler Reservoir
| Mean | Standard deviation | Minimum | Maximum | |
|---|---|---|---|---|
| Predicted value | 1.11 | 0.53 | –0.49 | 1.81 |
| S.E. of predicted value | 0.19 | 0.08 | 0.15 | 0.50 |
| Residual | 0.00 | 0.59 | –0.70 | 1.80 |
| Standard residual | 0.00 | 0.96 | –1.15 | 2.96 |
| Cook’s distance | 0.08 | 0.16 | 0.00 | 0.57 |
Results of regression analysis (n = 16) with all PCs for Çaygören Reservoir
| Included independent variables | Regression coefficient (bk) | Standard deviation of bk | t | p | R2 (%) |
|---|---|---|---|---|---|
| Constant | 1.14 | 0.3 | 3.79 | 0.02 | 76.8 |
| Score 7 | 0.77 | –2.2 | 1.8 | 0.049 | |
| Score 10 | 3.42 | 1.56 | 2.2 | 0.041 | |
| Score 12 | 0.8 | 0.5 | 2.08 | 0.045 |
Residual statistics (n = 17) for Çaygören Reservoir
| Mean | Standard deviation | Minimum | Maximum | |
|---|---|---|---|---|
| Predicted value | 1.26 | 0.66 | 0.28 | 2.52 |
| S.E. of predicted value | 0.40 | 0.11 | –1.47 | 1.89 |
| Residual | 0.00 | 1.176 | –2.35 | 2.93 |
| Standard residual | 0.00 | 0.97 | –1.91 | 2.41 |
| Cook’s distance | 0.06 | 0.07 | 0.01 | 1.61 |
Observed and predicted Chlorophyll-a values for Çaygören Reservoir
| Observations | Observed values (mg l–1) | First approach predicted values (mg l–1) | Second approach predicted values (mg l–1) |
|---|---|---|---|
| 1 | 1.75 | 0.7462 | 1.5680 |
| 2 | 2.04 | 2.4665 | 2.0199 |
| 3 | 2.00 | 1.2119 | 1.8576 |
| 4 | 1.21 | 0.9917 | 1.1429 |
| 5 | 1.26 | 0.6538 | 0.9731 |
| 6 | 1.09 | 0.621 | 0.8199 |
| 7 | 0.99 | 1.4281 | 0.9911 |
| 8 | 1.11 | 0.5003 | 1.2811 |
| 9 | 0.82 | 1.2926 | 0.6984 |
| 10 | 0.99 | 0.9912 | 0.8931 |
| 11 | 1.66 | 1.5972 | 1.8327 |
| 12 | 1.23 | 2.2135 | 1.2346 |
| 13 | 0.96 | 0.9209 | 1.2511 |
| 14 | 5.45 | 1.8412 | 5.4829 |
| 15 | 0.55 | 1.6093 | 0.392 |
| 16 | 1.01 | 1.6114 | 1.1065 |
| 17 | 1.04 | 1.5 | 1.34 |
Observed and predicted Chlorophyll-a values for Ikizcetepeler Reservoir
| Observations | Observed values (mg l–1) | First approach predicted values (mg l–1) | Second approach predicted values (mg l–1) |
|---|---|---|---|
| 1 | 1.62 | 1.5204 | 1.420 |
| 2 | 0.99 | 0.8411 | 0.790 |
| 3 | –0.70 | 0.7428 | –0.550 |
| 4 | 0.92 | 0.6361 | 0.780 |
| 5 | 0.94 | 2.0858 | 0.9100 |
| 6 | 3.34 | 2.0732 | 3.200 |
| 7 | 0.69 | 0.9732 | 0.6300 |
| 8 | 0.74 | 0.8894 | 0.6200 |
| 9 | 0.79 | 0.9133 | 0.6800 |
| 10 | 1.16 | 0.8023 | 1.000 |
| 11 | 1.71 | 1.6937 | 1.500 |
| 12 | 1.17 | 0.7573 | 1.110 |
| 13 | 1.10 | 1.3245 | 0.980 |
| 14 | 1.27 | 1.0466 | 1.150 |
| 15 | 0.95 | 0.881 | 0.830 |
| 16 | 1.05 | 0.559 | 0.900 |
| 17 | 1.03 | 0.98 | 1.100 |
Descriptive statistics of PCs for Ikizcetepeler Reservoir
| Principle component | Eigenvalue | Cumulative variance (%) |
|---|---|---|
| PC1 | 3.9 | 23.2 |
| PC2 | 2.5 | 38.0 |
| PC3 | 1.9 | 49.1 |
| PC4 | 1.6 | 58.6 |
| PC5 | 1.4 | 66.7 |
| PC6 | 1.2 | 73.8 |
| PC7 | 0.9 | 79.1 |
| PC8 | 0.8 | 83.7 |
| PC9 | 0.7 | 87.6 |
| PC10 | 0.5 | 90.5 |
| PC11 | 0.4 | 93.1 |
| PC12 | 0.3 | 94.9 |
| PC13 | 0.3 | 96.5 |
| PC14 | 0.3 | 98.1 |
| PC15 | 0.2 | 99.3 |
| PC16 | 0.1 | 99.9 |
| PC17 | 0.01 | 100 |