The lumped XAJ model has 13 parameters, including:
If full.UH = FALSE:
The parameter params must be a numeric vector looks like:
c(KC, IM, WUM, WLM, WDM, C, B, SM, EX, KI, KG, CI, CG, N, NK)
If full.UH = TRUE:
when use the instantaneous unit hydrograph of Nash, or looks like:
c(KC, IM, WUM, WLM, WDM, C, B, SM, EX, KI, KG, CI, CG, UH_1, UH_2, ..., UH_n)
UH_1, UH_2, ..., UH_n means the series of the unit hydrograph.
XAJ.param.rangeAn object of class data.frame with 15 rows and 4 columns.
KC : Ratio of potential evap to pan evap
IM : Fraction of impermeable area
WUM : Soil moisture capacity of upper layer
WLM : Soil moisture capacity of lower layer
WDM : Soil moisture capacity of deep layer
C : Coefficient of deep evap
B : Exponent of the soil moisture storage capacity curve
SM : Areal mean free water capacity of the surface soil layer
EX : Exponent of the free water capacity curve
KI : outflow coefficients of the free water storage to interflow
KG : outflow coefficients of the free water storage to groundwater
CI : recession constant of the lower interflow storage
CG : recession constant of groundwater storage.
N: (optional) number of reservoirs in the instantaneous unit hydrograph
NK: (optional) common storage coefficient in the instantaneous unit hydrograph
If full.UH = TRUE: 14~end: is the full unit hydrograph defined by user.