Default value of alpha_h1 should be 0 to correctly model waterlogging

[AquaPore]

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Reproducible Example

Dear Wflow developper,

I believe that the default value of alpha_h1 =1 is not correct, as most vegetation, when the roots at a cell is waterlogged, transpiration ceases, and therefore I understand that the default value of alpha_h1 should be 0.

Waterlogged roots become nonfunctional because excess water blocks oxygen intake and hinders carbon dioxide diffusion, preventing roots from absorbing water and nutrients. This causes the plant to suffocate underground and suffer from water deficiency above ground.

When alpha_h1 =0

$$\begin{cases} \mathbf{if},, \left| h \right|>\left| h_4 \right| \Rightarrow F_{rwu}=0\\ \mathbf{elseif}\left| h \right|>\left| h_3 \right| \Rightarrow F_{rwu}=\frac{\left| h_4 \right|-\left| h \right|}{\left| h_4 \right|-\left| h_3 \right|}\\ \mathbf{elseif}\left| h \right|>\left| h_2 \right| \Rightarrow F_{rwu}=1\\ \mathbf{elseif}\left| ,,h \right|>\left| h_1 \right| \Rightarrow F_{rwu}=\frac{\left| h \right|-\left| h_1 \right|}{\left| h_2 \right|-\left| h_1 \right|}\\ \mathbf{else} \left| h \right|<\left| h_1 \right| \Rightarrow F_{rwu}=0\\ \end{cases}$$

With kindness,
Joseph A.P. Pollacco

Current behaviour

Default value of alpha_h1 =1

Desired behaviour

Default value of alpha_h1 =0

Additional Context

No response