Package net.simplace.sim.components.evapotran.fao56

Klasse ReferenceETHargreaves

java.lang.Object

net.simplace.sim.model.FWSimComponent

net.simplace.sim.components.evapotran.fao56.ReferenceETHargreaves

Alle implementierten Schnittstellen:

net.simplace.sim.util.FWSimFieldContainer

public class ReferenceETHargreaves
extends net.simplace.sim.model.FWSimComponent

Calculates reference evapotranspiration ET0 by Hargreaves method using solar radiation and temperature

Hargreaves 1975

Uses the Hargreaves 1975 formula for ET0 calculation from temperature and solar radiation

\( ET0 = 0.0135 (MeanTemperature + 17.8) SolarRadiationMM \)

Where

\( SolarRadiationMM = 0.408 \cdot \text{iSolarRadiation} \)

is the solar radiation in mm/day, converted from MJ/(m^2 d). For conversion the user can use the fixed factor 0.408 or - by setting cConvertLeByTemp to true - the latent heat of vaporisation as a function of daily mean temperature 1/(2.501-0.002361*Tmean).

== Notice: Hargreaves <span class="invalid-tag">Ungültige Eingabe: "&"</span> Sarmani 1985 ==

The Hargreaves <span class="invalid-tag">Ungültige Eingabe: "&"</span> Sarmani 1985 formula is

\( ET0 = 0.0023(MeanTemperature + 17.8) \sqrt{MaxTemp - MinTemp} \cdot ExtraterrestrialRadiationMM \)

To use Hargreaves <span class="invalid-tag">Ungültige Eingabe: "&"</span> Sarmani method, link the output SolarRadiation from the SimComponent SolarRadiationFromTemperature to the input iSolarRadiation of ReferenceETHargreaves.

References

• Hargreaves G. H. 1975. Moisture availability and crop production. Transactions of the American Society of Agricultural Engineers 18:980-984.
• Hargreaves G. H. and Z. A. Samani, 1985. Reference crop evapotranspiration from temperature. Appl. Eng. Agric. 1, 96-99.

Autor:

Gunther Krauss, gk@uni-bonn.de

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cConvertLeByTemp	Use latent heat (Le) of vaporisation as a function of temperature to convert radiation from MJ/(m^2 day) to mm/day.	BOOLEAN		-	-	false
input	iSolarRadiation	solar radiation	DOUBLE	MJ/(m2 d)	-	-	0.0
input	iTMax	maximum daily temperature	DOUBLE	°C	-	-	0.0
input	iTMin	minimum daily temperature	DOUBLE	°C	-	-	0.0
out	ReferenceCropEvapotranspiration	reference evapotranspiration (ET0)	DOUBLE	mm/d	-	-	0.0

Verschachtelte Klassen - Übersicht

Von Klasse geerbte verschachtelte Klassen/Schnittstellen net.simplace.sim.model.FWSimComponent

net.simplace.sim.model.FWSimComponent.TEST_STATE

Feldübersicht

Von Klasse geerbte Felder net.simplace.sim.model.FWSimComponent

iFieldMap, iFrequence, iInputMap, iJexlRule, iMasterComponentGroup, iName, iOrderNumber, isComponentGroup, iSimComponentElement, iSimModel, iVarMap

Konstruktorübersicht

Konstruktoren

Konstruktor	Beschreibung
ReferenceETHargreaves()	Empty constructor used by class.forName()

Methodenübersicht

Modifizierer und Typ	Methode	Beschreibung
protected net.simplace.sim.model.FWSimComponent	clone(net.simplace.sim.util.FWSimVarMap aVarMap)
HashMap<String,net.simplace.sim.util.FWSimVariable<?>>	createVariables()	Create the FWSimVariables as interface for this SimComponent
HashMap<String,net.simplace.sim.util.FWSimVariable<?>>	fillTestVariables(int aParamIndex, net.simplace.sim.model.FWSimComponent.TEST_STATE aDefineOrCheck)	called for single component test to check the components algorithm.
protected void	init()	Initializes the fields by getting input and output FWSimVariables from VarMap
protected void	process()	Process the algorithm and write the results back to VarMap

Von Klasse geerbte Methoden net.simplace.sim.model.FWSimComponent

addVariable, bind, checkCondition, createSimComponent, createSimComponent, createSimComponent, createSimComponent, doProcess, getConstantVariables, getContentType, getCreateFormXML, getDescription, getEditFormXML, getFieldMap, getFrequence, getFrequenceRuleScript, getInputs, getInputVariables, getMasterComponentGroup, getName, getOrderNumber, getOutputVariables, getVariable, getVariableField, getVarMap, initialize, isConditionCheck, isVariableAvailable, performLinks, performLinks, readInputs, removeVariable, reset, runComponentTest, setVariablesDefault, toComponentLinkingXML, toDocXML, toGroupXML, toOutputDefinitionXML, toResourcesDataXML, toResourcesDefinitionXML, toString, toXML, writeVarInfos

Von Klasse geerbte Methoden java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Konstruktordetails

ReferenceETHargreaves

public ReferenceETHargreaves()

Empty constructor used by class.forName()

Methodendetails

createVariables

public HashMap<String,net.simplace.sim.util.FWSimVariable<?>> createVariables()

Create the FWSimVariables as interface for this SimComponent

Angegeben von:

createVariables in Schnittstelle net.simplace.sim.util.FWSimFieldContainer

Angegeben von:

createVariables in Klasse net.simplace.sim.model.FWSimComponent

Siehe auch:

• FWSimComponent.createVariables()

init

protected void init()

Initializes the fields by getting input and output FWSimVariables from VarMap

Angegeben von:

init in Klasse net.simplace.sim.model.FWSimComponent

Siehe auch:

• FWSimComponent.init()

process

protected void process()

Process the algorithm and write the results back to VarMap

Angegeben von:

process in Klasse net.simplace.sim.model.FWSimComponent

Siehe auch:

• FWSimComponent.process()

fillTestVariables

public HashMap<String,net.simplace.sim.util.FWSimVariable<?>> fillTestVariables(int aParamIndex,
 net.simplace.sim.model.FWSimComponent.TEST_STATE aDefineOrCheck)

called for single component test to check the components algorithm.

Angegeben von:

fillTestVariables in Klasse net.simplace.sim.model.FWSimComponent

Siehe auch:

• Ungültige Referenz

  net.simplace.sim.util.FWSimFieldContainer#fillTestVariables(int aParamIndex, TEST_STATE aDefineOrCheck)

clone

protected net.simplace.sim.model.FWSimComponent clone(net.simplace.sim.util.FWSimVarMap aVarMap)

Angegeben von:

clone in Klasse net.simplace.sim.model.FWSimComponent

Siehe auch:

• FWSimComponent.clone(net.simplace.sim.util.FWSimVarMap)