/// <summary>Creates a list of temperature range factors used to estimate daily temperature from Min and Max temp</summary>
/// <returns></returns>
public List <double> SubDailyTemperatures()
{
double d = MetData.CalculateDayLength(-6);
double Tmin = MetData.MinT;
double Tmax = MetData.MaxT;
double TmaxB = MetData.MaxT;
double TminA = MetData.MinT;
double Hsrise = MetData.CalculateSunRise();
double Hsset = MetData.CalculateSunSet();
List <double> sdts = new List <double>();
for (int Th = 0; Th <= 23; Th++)
{
double Ta = 1.0;
if (Th < Hsrise)
{
// Hour between midnight and sunrise
// PERIOD A MaxTB is max. temperature, before day considered
//this is the sunset temperature of based on the previous day
double n = 24 - d;
Tsset = Tmin + (TmaxB - Tmin) *
Math.Sin(Math.PI * (d / (d + 2 * P)));
Ta = (Tmin - Tsset * Math.Exp(-n / TC) +
(Tsset - Tmin) * Math.Exp(-(Th + 24 - Hsset) / TC)) /
(1 - Math.Exp(-n / TC));
}
else if (Th >= Hsrise & Th < 12 + P)
{
// PERIOD B Hour between sunrise and normal time of MaxT
Ta = Tmin + (Tmax - Tmin) *
Math.Sin(Math.PI * (Th - Hsrise) / (d + 2 * P));
}
else if (Th >= 12 + P & Th < Hsset)
{
// PERIOD C Hour between normal time of MaxT and sunset
// MinTA is min. temperature, after day considered
Ta = TminA + (Tmax - TminA) *
Math.Sin(Math.PI * (Th - Hsrise) / (d + 2 * P));
}
else
{
// PERIOD D Hour between sunset and midnight
Tsset = TminA + (Tmax - TminA) * Math.Sin(Math.PI * (d / (d + 2 * P)));
double n = 24 - d;
Ta = (TminA - Tsset * Math.Exp(-n / TC) +
(Tsset - TminA) * Math.Exp(-(Th - Hsset) / TC)) /
(1 - Math.Exp(-n / TC));
}
sdts.Add(Ta);
}
return(sdts);
}
private void OnDoWeather(object sender, EventArgs e)
{
if (MetData != null)
{
DayLength = MetData.CalculateDayLength(Twilight);
}
else
{
DayLength = 0;
}
}
// Calculates the ground solar incident radiation per hour and scales it to the actual radiation
// Developed by Greg McLean and adapted/modified by Behnam (Ben) Ababaei.
/// <summary>
/// Hourly radiation estimation ported from https://github.com/BrianCollinss/ApsimX/blob/12a89f9981e2636f13251b0faa30200a98b713ce/Models/Functions/SupplyFunctions/MaximumHourlyTrModel.cs#L260
/// by Hamish
/// Note, this has not been tested and probably has errors as it is not a dirrect port
/// </summary>
/// <returns></returns>
public List <double> SubDailyValues()
{
List <double> hourlyRad = new List <double>();
double latR = Math.PI / 180.0 * MetData.Latitude; // convert latitude (degrees) to radians
double GlobalRadiation = MetData.Radn * 1e6; // solar radiation
double PI = Math.PI;
double RAD = PI / 180.0;
//Declination of the sun as function of Daynumber (vDay)
double Dec = -Math.Asin(Math.Sin(23.45 * RAD) * Math.Cos(2.0 * PI * ((double)clock.Today.DayOfYear + 10.0) / 365.0));
//vSin, vCos and vRsc are intermediate variables
double Sin = Math.Sin(latR) * Math.Sin(Dec);
double Cos = Math.Cos(latR) * Math.Cos(Dec);
double Rsc = Sin / Cos;
//Astronomical daylength (hr)
double DayL = MetData.CalculateDayLength(-6);
double DailySinE = 3600.0 * (DayL * (Sin + 0.4 * (Sin * Sin + Cos * Cos * 0.5))
+ 12.0 * Cos * (2.0 + 3.0 * 0.4 * Sin) * Math.Sqrt(1.0 - Rsc * Rsc) / PI);
double riseHour = MetData.CalculateSunRise();
double setHour = MetData.CalculateSunSet();
for (int t = 0; t <= 23; t++)
{
double Hour1 = Math.Min(setHour, Math.Max(riseHour, t));
double SinHeight1 = Math.Max(0.0, Sin + Cos * Math.Cos(2.0 * PI * (Hour1 - 12.0) / 24.0));
double Hour2 = Math.Min(setHour, Math.Max(riseHour, t + 1));
double SinHeight2 = Math.Max(0.0, Sin + Cos * Math.Cos(2.0 * PI * (Hour2 - 12.0) / 24.0));
double SinHeight = 0.5 * (SinHeight1 + SinHeight2);
hourlyRad.Add(Math.Max(0, GlobalRadiation * SinHeight * (1.0 + 0.4 * SinHeight) / DailySinE));
hourlyRad[t] *= HourlyWeight(t + 1, riseHour, setHour);
}
return(hourlyRad);
}
/// <summary> /// Gets the duration of the day in hours. /// </summary> /// <param name="Twilight">Angular distance between 90° and end of twilight - altitude of sun. +ve up, -ve down.</param> public double CalculateDayLength(double Twilight) => weather.CalculateDayLength(Twilight);
