Soil infiltration functions:

  • Function hydrology_infiltrationBoughton calculates the amount of water that infiltrates into the topsoil, according to the USDA SCS curve number method (Boughton 1989).

  • Function hydrology_infiltrationGreenAmpt calculates the amount of water that infiltrates into the topsoil, according to the model by Green & Ampt (1911).

  • Function hydrology_infiltrationAmount uses either Green & Ampt (1911) or Boughton (1989) to estimate infiltration.

  • Function hydrology_infiltrationRepartition distributes infiltration among soil layers depending on macroporosity.

hydrology_infiltrationBoughton(input, Ssoil)

hydrology_infiltrationGreenAmpt(t, psi_w, Ksat, theta_sat, theta_dry)

hydrology_infiltrationRepartition(I, widths, macro, a = -0.005, b = 3)

hydrology_infiltrationAmount(
  rainfallInput,
  rainfallIntensity,
  soil,
  soilFunctions,
  model = "GreenAmpt1911",
  K_correction = 1
)

Arguments

input

A numeric vector of (daily) water input (in mm of water).

Ssoil

Soil water storage capacity (can be referred to topsoil) (in mm of water).

t

Time of the infiltration event

psi_w

Matric potential at the wetting front

Ksat

hydraulic conductivity at saturation

theta_sat

volumetric content at saturation

theta_dry

volumetric content at the dry side of the wetting front

I

Soil infiltration (in mm of water).

widths

Width of soil layers (in mm).

macro

Macroporosity of soil layers (in %).

a, b

Parameters of the extinction function used for water infiltration.

rainfallInput

Water from the rainfall event reaching the soil surface (mm)

rainfallIntensity

rainfall intensity rate (mm/h)

soil

A list containing the description of the soil (see soil).

soilFunctions

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

model

Infiltration model, either "GreenAmpt1911" or "Boughton1989"

K_correction

Correction for saturated conductivity, to account for increased infiltration due to macropore presence

Value

Functions hydrology_infiltrationBoughton, hydrology_infiltrationGreenAmpt and hydrology_infiltrationAmount

return the daily amount of water that infiltrates into the soil (in mm of water).

Function hydrology_infiltrationRepartition returns the amount of infiltrated water that reaches each soil layer.

Details

When using function hydrology_infiltrationGreenAmpt, the units of Ksat, t and psi_wat have to be in the same system (e.g. cm/h, h and cm).

References

Boughton (1989). A review of the USDA SCS curve number method. - Australian Journal of Soil Research 27: 511-523.

Green, W.H. and Ampt, G.A. (1911) Studies on Soil Physics, 1: The Flow of Air and Water through Soils. The Journal of Agricultural Science, 4, 1-24.

Author

Miquel De Cáceres Ainsa, CREAF