zpd_fun: Zero Plane Displacement Function.

In tom-locatelli/fgr: R Version of the ForestGALES wind risk model

Description

Calculates the height of the zero plane displacement.

Usage

zpd_fun(
  cr_width,
  cr_depth,
  spacing,
  uguess,
  n_drag,
  c_drag,
  drag_upper_limit,
  ht,
  fgr_constants
)

Arguments

cr_width	Width of the canopy in windless conditions (m).
cr_depth	Length of the canopy in windless conditions (m).
spacing	Mean distance between trees (m).
uguess	Critical wind speed at canopy top calculated with the roughness or single-tree method (m s-1).
n_drag	N parameter of the drag coefficient formula (dimensionless).
c_drag	C parameter of the drag coefficient formula (dimensionless).
drag_upper_limit	Maximum wind speed used during the experiments from which n_drag and c_drag were derived (m*s-1).
ht	Height of the tree. In the 'roughness' method, this is stand mean height. In the TMC method, this is 'equivalent mean height' (m).

Value

zpd, the height of the zero plane displacement (m).

tom-locatelli/fgr documentation built on Oct. 2, 2020, 2:09 a.m.