Support different vertical hydraulic conductivity (kv) profiles in SBM

[verseve]

Feature type

Adding new functionality

Improvement Description

The vertical hydraulic conductivity at the surface kv₀ declines with depth exponentially, controlled by the model parameter f. This vertical hydraulic conductivity profile is often based on data available for soil layers to a depth of ~2 m. For below 2 m an exponential decline of kv₀ may not always be the best choice, and a user may want to use available vertical hydraulic conductivity data of soil layers directly in the model. Because of this, an improvement is to support the following kv profiles:

• exponential: Exponential decline (default).
• exponential_constant: Exponential decline (for example until soil layers with measurements (e.g. 2 m)) and constant (rest of the soil column).
• layered: kv value for each soil layer.
• layered_exponential: Layered (for example until soil layers with measurements (e.g. 2 m)) and exponential (rest of the soil column).

Implementation Description

Add different profiles to initialization of wflow_sbm, vertical unsaturated flow of SBM and lateral subsurface flow (kinematic wave).
For layered and layered_exponential profiles, an average horizontal hydraulic conductivity can used for lateral subsurface flow.

Additional Context

No response