To identify the parameters having a major influence on the outputs of the model, a sensitivity analysis was carried out from the daily flows observed. Initially, four parameters relating globally to runoff and groundwater were identified as being the most sensitive in calibration (Table 8).
Sensitivity analysis and calibrated parameters
| Parameter name . | Sensitivity . | Calibration . | |||
|---|---|---|---|---|---|
| t-stat . | p-value . | Sensitivity range . | Parameter value range . | Fitted value . | |
| r_CN2.mgt (Surface runoff) | 0.26 | 0.8 | 1 | –0.2–0.2 | –0.17 |
| v_ALPHA_BF.gw (Groundwater) | 0.88 | 0.41 | 2 | 0–1 | 0.22 |
| v_GW_DELAY.gw (Groundwater) | 0.76 | 0.48 | 3 | 30–450 | 146 |
| v_GWQMIN.gw (Groundwater) | 0.79 | 0.46 | 4 | 0–2 | 1.4 |
| Parameter name . | Sensitivity . | Calibration . | |||
|---|---|---|---|---|---|
| t-stat . | p-value . | Sensitivity range . | Parameter value range . | Fitted value . | |
| r_CN2.mgt (Surface runoff) | 0.26 | 0.8 | 1 | –0.2–0.2 | –0.17 |
| v_ALPHA_BF.gw (Groundwater) | 0.88 | 0.41 | 2 | 0–1 | 0.22 |
| v_GW_DELAY.gw (Groundwater) | 0.76 | 0.48 | 3 | 30–450 | 146 |
| v_GWQMIN.gw (Groundwater) | 0.79 | 0.46 | 4 | 0–2 | 1.4 |