phydrus.model.Model.add_root_uptake

Model.add_root_uptake(model=0, crootmax=0, omegac=0.5, p0=- 10, p2h=- 200, p2l=- 800, p3=- 8000, r2h=0.5, r2l=0.1, poptm=None, p50=- 800, pexp=3, lsolred=False)[source]

Method to add rootwater update modeule to the model.

Parameters

  • model (int, optional) – Type of root water uptake stress response function. 0 = Feddes et al. [1978]. 1 = S-shaped, van Genuchten [1987]

  • crootmax (float, optional) – Maximum allowed concentration in the root solute uptake term for the first solute [ML-3]. When the nodal concentration is lower than cRootMax, all solute is taken up. When the nodal concentration is higher than cRootMax, additional solute stays behind.

  • omegac (float, optional) – Maximum allowed concentration in the root solute uptake term for the last solute [ML-3].

  • p0 (float, optional) – Only used if model=0. Value of the pressure head, h1, below which roots start to extract water from the soil.

  • p2h (float, optional) – Only used if model=0. Value of the limiting pressure head, h3, below which the roots cannot extract water at the maximum rate (assuming a potential transpiration rate of r2H).

  • p2l (float, optional) – Only used if model=0. As above, but for a potential transpiration rate of r2L.

  • p3 (float, optional) – Only used if model=0. Value of the pressure head, h4, below which root water uptake ceases (usually equal to the wilting point).

  • r2h (float, optional) – Only used if model=0. Potential transpiration rate [LT-1] (currently set at 0.5 cm/day).

  • r2l (float, optional) – Only used if model=0. Potential transpiration rate [LT-1] (currently set at 0.1 cm/day).

  • poptm (list, optional) – Value of the pressure head, h2, below which roots start to extract water at the maximum possible rate. The length of poptm should equal the No. of materials.

  • p50 (float, optioal) – Only used if model=1. Value of the pressure head, h50, at which the root water uptake is reduced by 50%. Default is -800cm.

  • pexp (float, optional) – Only used if model=1. Exponent, p, in the S-shaped root water uptake stress response function. Default value is 3.

  • lsolred (bool, optional) – Set to True if root water uptake is reduced due to salinity. NOT IMPLEMENTED YET.

phydrus.model.Model.add_root_growth phydrus.model.Model.add_solute