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Rothermel (1972) gives E = 0.715 exp(-3.59e-4 sigma) with sigma in 1/ft. In C++ "10E-4" is 10 x 10^-4 = 1e-3, so E was ~10x too small (SH5: 0.058 instead of 0.556) and the wind factor phi_w = C U^B (beta/beta_op)^-E ~4x too small for shrub fuels. RothermelAndrews2018.cpp and FarsitePropagationModel.cpp already use 3.59e-4. Calibrations made with the previous value (propagationSpeedAdjustmentFactor, windReductionFactor) need to be revisited. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Rothermel (1972) gives E = 0.715 exp(-3.59e-4 sigma) with sigma in 1/ft. In C++ "10E-4" is 10 x 10^-4 = 1e-3, so E was ~10x too small (SH5: 0.058 instead of 0.556) and the wind factor phi_w = C U^B (beta/beta_op)^-E ~4x too small for shrub fuels. RothermelAndrews2018.cpp and FarsitePropagationModel.cpp already use 3.59e-4.
Calibrations made with the previous value (propagationSpeedAdjustmentFactor, windReductionFactor) need to be revisited.