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net.simplace.client.simulation.lap.fao56.radiation.NetRadiationFromAny

Calculates net radiation from either global radiation or, if no global radiation available, from sun hours using (FAO 56) methods. Extra-terrestrial as well as solar radiation (in case of sun hours input) are also calculated.

Chosen method depends on input availability, preferential order as below.

From solar radiation.
From sun hours.

Note: If data is missing in weather inputs, calculation method may change without throwing an error. This may be desired when dealing with an incomplete dataset, but undesired when missing data unintendedly changes the calculation method. An INFO message is written to log when the method changes.

For documentation of the formulas please check the original reference (FAO 56)

References

(FAO 56): Allen, Crop evapotranspiration - Guidelines for computing crop water requirements - FAO Irrigation and drainage paper 56, 1998

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cAltitude	elevation above sea level	DOUBLE	m	-	-	0.0
constant	cAngstromRegressionConstant	Angstrom equation regression constant	DOUBLE	1	-	-	0.25
constant	cAngstromRegressionSlope	Angstrom equation regression slope	DOUBLE	1	-	-	0.5
constant	cLatitude	latitude	DOUBLE	°	-90.0	90.0	0.0
constant	cUseAngstromVariables	use measured Angstrom variables if true, else use default ones	BOOLEAN		-	-	false
input	iActualVapourPressure	actual vapour pressure	DOUBLE	kPa	-	-	0.0
input	iSolarRadiation	solar or shortwave radiation	DOUBLE	MJ/(m2 d)	-	-	-
input	iSunHours	actual duration of sunshine	DOUBLE	h	0.0	24.0	-
input	iTMax	maximum daily temperature	DOUBLE	°C	-100.0	100.0	0.0
input	iTMin	minimum daily temperature	DOUBLE	°C	-100.0	100.0	0.0
out	ExtraterrestrialRadiation	extraterrestrial radiation	DOUBLE	MJ/(m2 d)	-	-	0.0
out	NetOutgoingLWRadiation	net outgoing longwaveRadiation	DOUBLE	MJ/(m2 d)	-	-	0.0
out	NetRadiation	net radiation	DOUBLE	MJ/(m2 d)	-	-	0.0
out	NetSolarRadiation	net solar or shortwave radiation	DOUBLE	MJ/(m2 d)	-	-	0.0
out	SolarRadiation	solar or shortwave radiation	DOUBLE	MJ/(m2 d)	-	-	0.0

public class NetRadiationFromAny extends
net.simplace.simulation.model.FWSimComponent {
// Public Constructors
public NetRadiationFromAny();

// Public Instance Methods

public HashMap createVariables(); // Defines
net.simplace.simulation.model.FWSimComponent

Create the FWSimVariables as interface for this SimComponent

// Protected Instance Methods

protected void init(); // Defines
net.simplace.simulation.model.FWSimComponent

Initializes the fields by getting input and output FWSimVariables from VarMap

protected void process(); // Defines
net.simplace.simulation.model.FWSimComponent

Process the algorithm and write the results back to VarMap

protected FWSimComponent clone(FWSimVarMap aVarMap);
// Defines net.simplace.simulation.model.FWSimComponent

creates a clone from this SimComponent for use in other threads

}

Hierarchy: java.lang.Object - net.simplace.simulation.model.FWSimComponent (net.simplace.simulation.util.FWSimFieldContainer) - NetRadiationFromAny