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net.simplace.usermodules.gzhao.SimpleAutomaticIrrigation_Irri_Canopy

Simple automatic irrigation component to be used in combination with SimComponents calculating soil water balance in layered soils

This SimComponent requires input about daily available mobile water (WM) and retained water (WR) in each soil layer with the relevant soil depth from other SimComponents like SlimWater or ImprovedSoilWater. The depth of the soil moisture control section for triggering irrigation time and volume is defined by the variable cIrrigationTriggerDepth.

In a first step, the sum of available mobile soil water (iWM) and retained water (iWR) within the soil moisture control section is calculated (CumulativeAvailableWater) and compared to the difference between cSoilWaterFieldCapacity and cSoilWaterWiltingPoint for layers above cIrrigationTriggerDepth (cumulativeWRH).

If the ratio between CumulativeAvailableWater and cumulativeWRH is lower than cIrrigationTriggerFactor, then irrigation is triggered. The irrigation volume applied AppliedIrrigationDepth is calculated as the difference between available water capacity and actual available water over the whole soil depth. The calculated AppliedIrrigationDepth is added to the incoming iRAIN and the sum is output as RainAndIrrigation.

Thus, after each irrigation event the soil profile should be at field capacity if no run-off occurs. The module also determines whether surface run-off should be calculated (CalculateRunoff) if iRAIN exceeds cMaxRainWithoutRunoff (amount of rain below which no surface run-off can occur).

Component Variables

Content Type	Name	Description	Data Type	Unit	Min Value	Max Value	Default Value
constant	cIrrigationTriggerDepth	depth to sum plant available water to, to determine if irrigation is required	DOUBLE	m	-	-	0.0
constant	cIrrigationTriggerFactor	fraction of total plant available water in a given depth of soil below which irrigation is applied	DOUBLE	1	-	-	0.0
constant	cMaxRainWithoutRunoff	maximum precipitation at which no runoff is calculated	DOUBLE	mm/d	-	-	0.0
constant	cSoilLayerDepth	depth of soil layers	DOUBLEARRAY	m	-	-	-
constant	cSoilWaterFieldCapacity	field capacity per layer	DOUBLEARRAY	m3/m3	-	-	-
constant	cSoilWaterWiltingPoint	wilting point per layer	DOUBLEARRAY	m3/m3	-	-	-
input	WithCrop	Check weather with Crop	BOOLEAN		-	-	true
input	iRAIN	precipitation	DOUBLE	mm/d	-	-	0.0
input	iWM	mobile water per layer	DOUBLEARRAY	mm	-	-	-
input	iWR	retained water per layer	DOUBLEARRAY	mm	-	-	-
out	AppliedIrrDepth	daily applied depth of irrigation	DOUBLE	mm/d	-	-	0.0
out	CalculateRunoff	-	BOOLEAN		-	-	true
out	CumulativeAppliedIrrDepth	cumulative applied depth of irrigation	DOUBLE	mm	-	-	0.0
out	RainAndIrrigation	precipitation + irrigation	DOUBLE	mm/d	-	-	0.0

public class SimpleAutomaticIrrigation_Irri_Canopy extends
net.simplace.sim.model.FWSimComponent {
// Public Constructors
public SimpleAutomaticIrrigation_Irri_Canopy(String aName, HashMap aFieldMap,
HashMap aInputMap, Element aSimComponentElement, FWSimVarMap aVarMap,
int aOrderNumber);
public SimpleAutomaticIrrigation_Irri_Canopy();

// Public Instance Methods

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

// Protected Instance Methods

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

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

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) - SimpleAutomaticIrrigation_Irri_Canopy