hydrology_infiltration: Soil infiltration

In medfate: Mediterranean Forest Simulation

Soil infiltration

Description

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.

Usage

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

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).

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.

Author(s)

Miquel De Cáceres Ainsa, CREAF

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.

See Also

spwb, hydrology_waterInputs

medfate documentation built on April 4, 2025, 2:01 a.m.