An R implementation of three-source Xinanjiang model by Renjun Zhao, used for daily streamflow simulation.
XAJ(PREC, EVAP, params, area = dt * 3.6, dt = 24, full.UH = FALSE)This function returns a data frame of some common variables of the XAJ model at each time step, such as evaporation, soil moisture, surface and underground runoff.
E : Total evaporation (mm)
EU : Evaporation (mm) of upper soil layer
EL : Evaporation (mm) of lower soil layer
ED : Evaporation (mm) of deep soil layer
W : Total soil moisture (mm)
WU : Soil moisture (mm) of upper soil layer
WL : Soil moisture (mm) of lower soil layer
WD : Soil moisture (mm) of deep soil layer
R : Total runoff (mm) of each time step
RS : Surface runoff (mm) of each time step
RI : Interflow (mm) of each time step
RG : Underground runoff (mm) of each time step
Q : Total runoff (m^3/s) at the outlet of the basin
QS : Surface runoff (m^3/s) at the outlet of the basin
QI : Interflow runoff (m^3/s) at the outlet of the basin
QG : Underground runoff (m^3/s) at the outlet of the basin
Time series of precipitation (daily)
Time series of pan evaporation or potential evapotranspiration
(daily), length must equal to PREC
parameters XAJ.param.range()
Basin area (km^2).
time step (in hour) of the simulation
Use the unit hydrograph defined by user, rather than the instantaneous unit hydrograph (IUH) of Nash, for routing of surface runoff. Default FALSE.
Zhao and Liu, 1995. The Xinanjiang model, Computer Models of Watershed Hydrology, Water Resources Publication, Highlands Ranch, CO (1995), pp. 215-232