Gaussian mixing layer

[aefarrell]

Gaussian plumes released beneath an inversion become trapped, leading to larger ground-level concentrations.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.03%. Comparing base (6a98837) to head (44f1588).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   95.87%   96.03%   +0.16%     
==========================================
  Files          43       46       +3     
  Lines        2712     2823     +111     
==========================================
+ Hits         2600     2711     +111     
  Misses        112      112              

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[aefarrell]

Two mistakes:

• unit tests check an area where the mixing layer is largely irrelevant, not a good check for whether it is working!
• there is no check for if plume-rise has injected the plume above the mixing layer, which can't happen

[aefarrell]

Updates followed the philosophy that this should be an extension of the existing GaussianPlumeSolution by removing hard-coded domain checks, and adding methods to update PlumeRise objects to limit plume rise above the mixing layer.

The two algorithms are checked for correctness, basically, by seeing if they get the same answer. Which they should if enough terms are included in the sums.