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net.simplace.sim.components.evapotran.fao56.ReferenceETPM

Calculates reference evapotranspiration ET0 by Penman-Monteith with the FAO56 approach.

FAO Penman-Monteith equation determines the evapotranspiration from the hypothetical grass reference surface. (FAO 56)

Uses daily max/min temperature, actual vapour pressure, net radiation and wind speed. Checks for valid actual vapour pressure values.

For documentation of the formulas please check the orginal 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
constant	cAltitude	elevation above sea level	DOUBLE	m	-	-
input	iActualVapourPressure	actual vapour pressure	DOUBLE	kPa	-	-
input	iNetRadiation	net radiation	DOUBLE	MJ/(m2 d)	-	-
input	iTMax	maximum daily temperature	DOUBLE	°C	-	-
input	iTMin	minimum daily temperature	DOUBLE	°C	-	-
input	iWindspeed	wind speed at 2m height	DOUBLE	metre_per_second	-	-
out	ReferenceCropEvapotranspiration	reference evapotranspiration (ET0)	DOUBLE	mm/d	-	-

public class ReferenceETPM extends net.simplace.sim.model.FWSimComponent {
// Public Constructors
public ReferenceETPM();

// Public Instance Methods

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

Create the FWSimVariables as interface for this SimComponent

// Protected Instance Methods

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

Initializes the fields by getting input and output FWSimVariables from VarMap

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

Process the algorithm and write the results back to VarMap

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

creates a clone from this SimComponent for use in other threads

}

Hierarchy: java.lang.Object - net.simplace.sim.model.FWSimComponent (net.simplace.sim.util.FWSimFieldContainer) - ReferenceETPM