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Relative water attenuation beneath canopy

u_b.Rd

Calculates the relative water attenuation beneath the canopy, based on Plew, D. R. (2011). "Depth-Averaged Drag Coefficient for Modeling Flow through Suspended Canopies". Journal of Hydraulic Engineering, 137(2), 234–247. This function is not actually used within the main function grow_macroalgae().

Usage

u_b(
  U0,
  macro_state,
  SA_WW = 0.5 * (0.0306/2),
  site_params,
  constants = c(s = 0.0045, gam = 1.13, a2 = 0.2^2, Cb = 0.0025)
)

Arguments

U0

incoming incident water velocity (m/s)

macro_state

vector of named numbers. Must include:

  • biomass, macroalgae wet weight (g)

  • hm, algae height (m)

site_params

vector of named numbers. Must include:

  • hz, total water depth (m)

  • hc, vertical water column occupied by the canopy (m)

  • d_top, depth of the top of the canopy beneath the water surface (m)

constants

vector of named numbers defining extra constants for the attenuation submodel. Must include all constants, which have the following default values:

  • s = 0.0045

  • gam = 1.13

  • a2 = 0.2^2

  • Cb = 0.0025

Value

a scalar of relative water attenuation beneath canopy

Examples

examples
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