/// <summary>
/// Calculates the radiation absorbed by the canopy, based on the position of the sun
/// </summary>
private void CalcAbsorbedRadiations(ISolarRadiation radiation)
{
// Set parameters
Absorbed.DiffuseExtinction = Canopy.DiffuseExtCoeff;
Absorbed.LeafScattering = Canopy.LeafScatteringCoeff;
Absorbed.DiffuseReflection = Canopy.DiffuseReflectionCoeff;
// Photon calculations (used by photosynthesis)
var photons = Absorbed.CalcTotalRadiation(radiation.DirectPAR, radiation.DiffusePAR);
Sunlit.PhotonCount = Absorbed.CalcSunlitRadiation(radiation.DirectPAR, radiation.DiffusePAR);
Shaded.PhotonCount = photons - Sunlit.PhotonCount;
// Energy calculations (used by water interaction)
var PARDirect = radiation.Direct * 0.5 * 1000000;
var PARDiffuse = radiation.Diffuse * 0.5 * 1000000;
var NIRDirect = radiation.Direct * 0.5 * 1000000;
var NIRDiffuse = radiation.Diffuse * 0.5 * 1000000;
var PARTotalIrradiance = Absorbed.CalcTotalRadiation(PARDirect, PARDiffuse);
var SunlitPARTotalIrradiance = Absorbed.CalcSunlitRadiation(PARDirect, PARDiffuse);
var ShadedPARTotalIrradiance = PARTotalIrradiance - SunlitPARTotalIrradiance;
// Adjust parameters for NIR calculations
Absorbed.DiffuseExtinction = Canopy.DiffuseExtCoeffNIR;
Absorbed.LeafScattering = Canopy.LeafScatteringCoeffNIR;
Absorbed.DiffuseReflection = Canopy.DiffuseReflectionCoeffNIR;
var NIRTotalIrradiance = Absorbed.CalcTotalRadiation(NIRDirect, NIRDiffuse);
var SunlitNIRTotalIrradiance = Absorbed.CalcSunlitRadiation(NIRDirect, NIRDiffuse);
var ShadedNIRTotalIrradiance = NIRTotalIrradiance - SunlitNIRTotalIrradiance;
Sunlit.AbsorbedRadiation = SunlitPARTotalIrradiance + SunlitNIRTotalIrradiance;
Shaded.AbsorbedRadiation = ShadedPARTotalIrradiance + ShadedNIRTotalIrradiance;
}
public DCAPSTModel(
ISolarGeometry solar,
ISolarRadiation radiation,
ITemperature temperature,
IPathwayParameters pathway,
ICanopyAttributes canopy,
Transpiration trans
)
{
Solar = solar;
Radiation = radiation;
Temperature = temperature;
this.pathway = pathway;
Canopy = canopy;
transpiration = trans;
}
/// <summary>
/// Recalculates canopy parameters for a new time step
/// </summary>
public void DoTimestepAdjustment(ISolarRadiation radiation)
{
CalcLAI();
CalcAbsorbedRadiations(radiation);
CalcMaximumRates();
}
