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Total drag coefficient

C_t.Rd

Calculates the total drag coefficient, 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

C_t(
  U0,
  macro_state,
  site_params,
  spec_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)

spec_params

vector of named numbers. Must include:

  • SA_WW, conversion of wet weight to surface area

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

The total drag coefficient C_t