Parameters in streamflow calculation
| Streamflow calculation . | |||||
|---|---|---|---|---|---|
| Function Method . | Evapotranspiration . | Runoff generation . | Runoff separation . | Streamflow concentration . | |
| Three-layer evaporation pattern . | Vertical mixed runoff method . | Free water storage reservoir . | Linear reservoir . | Muskingum method . | |
| Meaning of parameter and its value range | K: ratio of potential evapotranspiration to pan evaporation (0.2–1.0) | WM: areal mean tension water capacity (180–350) FC: average steady infiltration rate of watershed (0.1–10) | KI: outflow coefficients of interflow (0.3–0.4) | CS: recession constant in the ‘‘lag and route’’ method (0.10–0.65) | KE and XE are parameters of the Muskingum method, which can be initially determined by hydraulic formulas (0.05–0.55) |
| WUM: tension water capacity of upper layer (10–20) | CI: recession constant of interflow storage (0.65–0.95) | ||||
| WLM: tension water capacity of lower layer (60–80) | B: exponent of the tension water capacity distribution curve (0.1–1.0) | KG: outflow coefficients of groundwater (0.1–1.0) | CG: recession constant of groundwater storage (0.1–1.0) | ||
| C: coefficient of deep evapotranspiration (0.1–0.2) | |||||
| Streamflow calculation . | |||||
|---|---|---|---|---|---|
| Function Method . | Evapotranspiration . | Runoff generation . | Runoff separation . | Streamflow concentration . | |
| Three-layer evaporation pattern . | Vertical mixed runoff method . | Free water storage reservoir . | Linear reservoir . | Muskingum method . | |
| Meaning of parameter and its value range | K: ratio of potential evapotranspiration to pan evaporation (0.2–1.0) | WM: areal mean tension water capacity (180–350) FC: average steady infiltration rate of watershed (0.1–10) | KI: outflow coefficients of interflow (0.3–0.4) | CS: recession constant in the ‘‘lag and route’’ method (0.10–0.65) | KE and XE are parameters of the Muskingum method, which can be initially determined by hydraulic formulas (0.05–0.55) |
| WUM: tension water capacity of upper layer (10–20) | CI: recession constant of interflow storage (0.65–0.95) | ||||
| WLM: tension water capacity of lower layer (60–80) | B: exponent of the tension water capacity distribution curve (0.1–1.0) | KG: outflow coefficients of groundwater (0.1–1.0) | CG: recession constant of groundwater storage (0.1–1.0) | ||
| C: coefficient of deep evapotranspiration (0.1–0.2) | |||||