Start | Index | Overview • PREV | UP | NEXT

net.simplace.client.simulation.lap.fao56.vapourpressure.VapourpressureFromAny

Calculates vapour pressure according to FAO56 methods.

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

Methods and required inputs:

From dew point: dew point
From maximum and minimum humidity: max and min humidity, and max and min temperature
From maximum humidity: max humidity and min temperature
From mean humidity: mean humidity, and max and min temperature
From minimum temperature: min temperature and (optionally) K_0

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.

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	cK_0	Correction for calculation of dew point from minimum temperature in arid climates	DOUBLE	°C	0.0	10.0	0.0
input	iRelHumidityMax	maximum relative humidity	DOUBLE	%	0.0	100.0	-
input	iRelHumidityMean	mean relative humidity	DOUBLE	%	0.0	100.0	-
input	iRelHumidityMin	minimum relative humidity	DOUBLE	%	0.0	100.0	-
input	iTDewpoint	dew point temperature	DOUBLE	°C	-100.0	100.0	-
input	iTMax	maximum daily temperature	DOUBLE	°C	-100.0	100.0	-
input	iTMin	minimum daily temperature	DOUBLE	°C	-100.0	100.0	-
out	ActualVapourPressure	actual vapour pressure	DOUBLE	kPa	-	-	-

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

// 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) - VapourpressureFromAny