XAJ {VIC5}

Run Xinanjiang (XAJ) model (three sources, lumped).

Description

An R implementation of three-source Xinanjiang model by Renjun Zhao, used for daily streamflow simulation.

Usage

XAJ(PREC, EVAP, params, area = dt * 3.6, dt = 24, full.UH = FALSE)

Arguments

PREC

Time series of precipitation (daily)

EVAP

Time series of pan evaporation or potential evapotranspiration (daily), length must equal to PREC

params

parameters XAJ.param.range()

area

Basin area (km^2).

dt

time step (in hour) of the simulation

full.UH

Use the unit hydrograph defined by user, rather than the instantaneous unit hydrograph (IUH) of Nash, for routing of surface runoff. Default FALSE.

Value

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.

The variables of the table including:

• 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

References

Zhao and Liu, 1995. The Xinanjiang model, Computer Models of Watershed Hydrology, Water Resources Publication, Highlands Ranch, CO (1995), pp. 215-232