When the calibrated model was re-run with SPPs as inputs at the daily scale, the model's performance did not show encouraging results. The NSE ranges from 0.34 (PERSIANN CDR) to 0.58 (GPM) when these SPPs are used to drive the model. At the monthly scale, the results from the model with TRMM-3B42V7 and GPM-IMERG V6 as inputs show that the model performance is satisfactory in terms of NSE and PBIAS and good in terms of CC (see Figure 17 and Table 8). These results show that the model can capture the overall streamflow pattern to an acceptable level. However, when PERSIANN-CDR was used as the input precipitation dataset, the model performance in NSE and PBIAS was unsatisfactory. The scatter plots (see Figure 17) show a considerable overestimation of the streamflow stemming from the rainfall estimates by the SPPs. Among the satellite precipitation products compared in this study, GPM-IMERGV6 shows better performance than the TRMM-3B42V7 and PERSIANN-CDR data sets.
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Table 8
SWAT model performance in simulating stream flow under Scenario A (IMD precipitation based SWAT model is calibrated and validated and the same is re-run with other precipitation products)
| Statistical Measures | Scenario A | ||||
|---|---|---|---|---|---|
| IMD Results | Calibrated model re-run by other precipitation products (Validation Period) | ||||
| Calibration Period | Validation Period | TRMM | GPM-IMERG | PERSIANN | |
| Daily Scale | |||||
| NSE | 0.69 | 0.68 | 0.32 | 0.38 | 0.28 |
| CC | 0.82 | 0.78 | 0.64 | 0.66 | 0.56 |
| Pbias | −1.7 | −8.4 | −23.4 | −25 | −39.2 |
| Monthly Scale | |||||
| NSE | 0.86 | 0.84 | 0.53 | 0.66 | 0.31 |
| CC | 0.92 | 0.91 | 0.85 | 0.87 | 0.79 |
| Pbias | −3.6 | −16.8 | −67.2 | −63.5 | −88.1 |
| Statistical Measures | Scenario A | ||||
|---|---|---|---|---|---|
| IMD Results | Calibrated model re-run by other precipitation products (Validation Period) | ||||
| Calibration Period | Validation Period | TRMM | GPM-IMERG | PERSIANN | |
| Daily Scale | |||||
| NSE | 0.69 | 0.68 | 0.32 | 0.38 | 0.28 |
| CC | 0.82 | 0.78 | 0.64 | 0.66 | 0.56 |
| Pbias | −1.7 | −8.4 | −23.4 | −25 | −39.2 |
| Monthly Scale | |||||
| NSE | 0.86 | 0.84 | 0.53 | 0.66 | 0.31 |
| CC | 0.92 | 0.91 | 0.85 | 0.87 | 0.79 |
| Pbias | −3.6 | −16.8 | −67.2 | −63.5 | −88.1 |
Figure 17
Scatter plot between observed and model simulated streamflow for Scenario A during the validation period using different SPPs (a–c) daily scale (d–f) monthly scale. The red line shows the X = Y line.
Figure 17
Scatter plot between observed and model simulated streamflow for Scenario A during the validation period using different SPPs (a–c) daily scale (d–f) monthly scale. The red line shows the X = Y line.