Implement new wildfire cheatgrass cycle equation

DrylandEcology / STEPWAT2

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Implement new wildfire cheatgrass cycle equation #523

Closed kpalmqui closed 8 months ago

kpalmqui commented 2 years ago

Needs to return p and range between 0 and 1.

Current implementation is housed in _getWildfireProbability and is based on the percent cover of cheatgrass.

Implement new equation as shown above.

ensure MAT (degrees C ) in code is converted to K for MAT
ensure MAP (cm) in code is converted to mm

See: fire-probability-model_description_v1_copy_20200616.docx

kpalmqui commented 2 years ago

in commit a0afff8, the units for AP are cm. This needs to be updated to mm based on the above equation.

kpalmqui commented 2 years ago

The equation was originally fit using orthogonal polynomial functions by accident. A new equation has been derived just fitting polynomial functions to the data. The new best model continues to include the same variables and the same transformation of variables, but the coefficients have changed drastically. Here is the new equation:

kpalmqui commented 1 year ago

Some additional changes were made to the fire equation to account for regional bias.

kpalmqui commented 1 year ago

closed by https://github.com/DrylandEcology/STEPWAT2/commit/3dc921699b3fa364670259e96881544d21c000c7

kpalmqui commented 10 months ago

Some additional changes were made to the fire equation to overcome a relationship between wildfire probability and the biomass of annual grasses and forbs that did not match the observed data.

final.fire.equation.October2023.docx