Research Article
Drought Assessment by a Short-/Long-Term Composited Drought Index in the Upper Huaihe River Basin, China
Table 1
Calibrated parameters for the daily Xinanjiang model in upper Huaihe River above the Xixian station.
| Parameters | Meaning | Values |
| KC | Ratio of potential evapotranspiration to pan evaporation | 0.89 | UM | Areal mean tension water capacity in the upper layer (mm) | 28 | LM | Areal mean tension water capacity in the lower layer (mm) | 85 | | Coefficient of deep evapotranspiration | 0.167 |
| WM | Areal mean tension water capacity (mm) | 150 | | Exponent of the tension water capacity curve | 0.45 | IM | Ratio of the impervious to the total area of the basin | 0.001 |
| SM | Areal mean of the free water capacity of the surface soil layer (mm) | 15 | EX | Exponent of the free water capacity curve | 1.5 | KG | Outflow coefficient of the free water storage to groundwater relationship | 0.55 |
| CS | Recession constant of surface water storage | 0.62 | CI | Recession constant of interflow water storage | 0.85 | CG | Recession constant of groundwater storage | 0.998 | | Lag time (d) | 2 | KE | Parameter of the Muskingum method | 24 | XE | Parameter of the Muskingum method | 0.3 |
|
|