Bare soil evaporation and herbaceous transpiration

Functions:

• Function hydrology_soilEvaporationAmount calculates the amount of evaporation from bare soil, following Ritchie (1972).

• Function hydrology_soilEvaporation calculates the amount of evaporation from bare soil and distributes it among soil layers.

• Function hydrology_herbaceousTranspiration calculates the amount of transpiration due to herbaceous plants.

Usage

hydrology_soilEvaporationAmount(DEF, PETs, Gsoil)

hydrology_soilEvaporation(
  soil,
  snowpack,
  soilFunctions,
  pet,
  LgroundSWR,
  modifySoil = TRUE
)

hydrology_herbaceousTranspiration(
  pet,
  LherbSWR,
  herbLAI,
  soil,
  soilFunctions,
  modifySoil = TRUE
)

Arguments

DEF

Water deficit in the (topsoil) layer.

PETs

Potential evapotranspiration at the soil surface.

Gsoil

Gamma parameter (maximum daily evaporation).

soil

An object of class soil.

snowpack

The amount of snow (in water equivalents, mm) in the snow pack.

soilFunctions

Soil water retention curve and conductivity functions, either 'SX' (for Saxton) or 'VG' (for Van Genuchten).

pet

Potential evapotranspiration for a given day (mm)

LgroundSWR

Percentage of short-wave radiation (SWR) reaching the ground.

modifySoil

Boolean flag to indicate that the input soil object should be modified during the simulation.

LherbSWR

Percentage of short-wave radiation (SWR) reaching the herbaceous layer.

herbLAI

Leaf area index of the herbaceous layer.

Value

Function hydrology_soilEvaporationAmount returns the amount of water evaporated from the soil.

Function hydrology_soilEvaporation returns a vector of water evaporated from each soil layer.

References

Ritchie (1972). Model for predicting evaporation from a row crop with incomplete cover. - Water resources research.

See also

spwb, hydrology_waterInputs, hydrology_infiltration

Author

Miquel De Cáceres Ainsa, CREAF