Yesterday I thought I made some sensible results from the model I am working on. However, today I realised that the water head exceeding land surface is a kind of scenario: you have intact peat layers but no vegetation at all, thus no interception of moisture by plants, nor enhanced storage by Sphagnum. Besides, I should assume a constant head layer below all layers so the precipitation can finally be received at this depth. Though adding this layer do not change the flooding at the surface, I think this model illustrates the influence of topography -- some areas with high elevation will eventually go dry.
The most important thing for Sphagnums, cannot be found out at this layer. For them to grow, the peat layer must have water present. The critical problem thus is the water head in the acrotelm. Thus I made another model with only two layers: one acrotelm and one constant head (a reservoir) below it. The simulation shows how deep water draws down in different locations. I'll try tomorrow make it a transient model so I can observe the process.
At this moment I think I will forget about that model for one night and do something else for a change.
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