Critical_Moments_Functions: Critical Moments Functions
In tom-locatelli/fgr: R Version of the ForestGALES wind risk model

Calculate the critical moments for breakage and overturning

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critical_moment_breakage(dbh, ht, cr_depth, mor, fknot)

critical_moment_overturning(c_reg, stem_density, stem_vol)

`dbh`	Diameter of the stem at breast height, i.e. 1.3m above the ground (cm). Depending on the method used ('roughness' or 'TMC') this can be either the arithmetic average of the dbh of all the trees in the stand, or the dbh of an individual tree.
`ht`	Tree height. Depending on the method used ('roughness' or 'TMC'), this can be either the mean tree in the stand, or each individual tree (m).
`cr_depth`	Length of the tree crown (m).
`mor`	Modulus of Rupture of green wood (MPa).
`fknot`	Knot factor (dimensionless).
`c_reg`	Regression coefficient of uprooting moment against stem weight (N m kg-1).
`stem_density`	Density of green wood of the stem (kg m-3).
`stem_vol`	Volume of the tree stem of the mean tree in the stand (m3). For the roughness method, this is stem volume of the mean tree. For the TMC method, this is individual tree stem voume.