Calculating the percent of the wetted width shaded by banks and vegetation

Translation of r_shade.m

Usage

shade_calc(
  delta,
  solar_altitude,
  bottom_width,
  BH,
  BS,
  WL,
  TH,
  overhang,
  overhang_height
)

Arguments

delta

difference between the sun and stream azimuth (sun-stream)

solar_altitude

Solar altitude (radians) calculated by solar_c.R

bottom_width

#ADD DETAILS

BH

Bank height

BS

Bank slope

WL

Water level

TH

Tree height

overhang

Effectively canopy radius

overhang_height

height of the maximum canopy overhang (think canopy radius)

Value

Returns percent of the wetted width shaded by the bank and by vegetation