The linear retention curve provides a simple linear relationship between storage and head. More...

Inheritance diagram for LinearRetention:

Collaboration diagram for LinearRetention:

Detailed Description

The linear retention curve provides a simple linear relationship between storage and head.

Head function (head in m, calculated from upper side control volume)

\[ h(\theta) = -\Delta z \left( 1 - \frac{\theta - \theta_r}{\theta_s - \theta_r} \right) \]

Conductivity function

\[ K(\theta) = K_{sat} \left(\frac{\theta - \theta_r}{\theta_s - \theta_r}\right)^\beta \]

Public Member Functions
virtual real	Diffusivity (real wetness) const
	Returns the Diffusivity of the soil.

virtual real	FillHeight (real lowerDepth, real Area, real Volume) const
	Returns the thickness of a soil column with a certain pore volume.

virtual real	K (real wetness) const
	Returns the conductivity in m/day at a certain depth and water content.

virtual real	MatricPotential (real wetness) const
	Returns the potential below upper side of the control volume in m.

virtual real	Porosity (real depth) const
	Returns the porosity at a certain depth.

virtual real	theta (real wetness) const
	returns the water content \(theta\) for a given wetness

virtual real	VoidVolume (real upperDepth, real lowerDepth, real Area) const
	Returns the void volume of a soil column.

virtual real	Wetness (real suction) const
	Returns the wetness (water content per pore volume) at a given head.

virtual real	Wetness_eff (real wetness, real pF_r=4.2) const
	Returns the effective wetness, using a residual pF value.

real	Wetness_pF (real pF) const
	returns the volumetric water content at a given pF value

Public Attributes
real	beta
	Power Law Constant.

real	Ksat
	Saturated Conductivity \(\frac m{day} \).

real	porosity
	Pore space \(\Phi \left[ \frac{m^3}{m^3 \mbox{soil}}\right]\).

real	porosity_decay
	Depth dependent decay of porosity in fraction/m. 0.1 means a decay of 10% per meter depth.

real	residual_wetness
	Residual wetness \( \frac{\theta_r}{\Phi}, where K(\theta_r) = 0 \).

real	thickness
	Thickness of the layer in m.

Member Function Documentation

virtual real Diffusivity ( real wetness ) const

virtualinherited

Returns the Diffusivity of the soil.

Not implemented for all retention curves. Diffusivity is used by MACROlikeMacroMicroExchange

virtual real Wetness_eff	(	real	wetness,
		real	pF_r = 4.2 ) const

virtualinherited

Returns the effective wetness, using a residual pF value.

\[w_{eff} = \frac{w_{act}-w\left(pF_r\right)}{1-w\left(pF_r\right)}\]

real beta

Power Law Constant.