Start | Index | Overview • PREV | UP | NEXT If DVS is >= StartWaterSensitiveDVS and < EndWaterSensitiveDVS, then
\[ \begin{eqnarray} Depletion = NominalDepletionLate + 0.04*(5.00 - EVAPO) \end{eqnarray} \]Based on the depletion factor (Depletion) the proportion of the extractable water (EXT) in the retained soil water (WR in mm) in each soil layer is calculated as
\[ \begin{eqnarray} EXT[i] &=& \frac {EVAPO}{(1-Depletion) \cdot TWRH} \end{eqnarray} \]where TWRH is the total amount of retainable water stored in the entire soil profile at field capacity (usually called "Available Water Capacity") and EVAPO is the reference evpotranspiration (both in mm).
N.B.: The calculation of the extraction factor for each layer is related to the total retainable water in the entire profile depth. As the profile depth is variable there could be a serious underestimation of EXT when increasing soil profile depth at early DVS when roots are still small. Therefore, the calculation of EXT at early DVS should not depend on TWRH
The amount of soil available water SAWR in the retained water fraction of each layer is then
\[ \begin{eqnarray} SAWR[i] &=& WR[i] \cdot EXT[i] \end{eqnarray} \]| Content Type | Name | Description | Data Type | Unit | Min Value | Max Value | Default Value |
|---|---|---|---|---|---|---|---|
| constant | cALFA | The proportion of the mobile water in each layer that moves downwards to the underlying layer | DOUBLEARRAY | 1 | - | - | - |
| constant | cCalculateRunoffWater | If set to true runoff water (WFAST) is calculated, otherwise rain which exceeds infiltration capacity of the soil is by-passing the soil matrix | BOOLEAN | 1 | - | - | false |
| constant | cDP | The proportion of leaching water which is lost from layer MD (the layer: containing the drains) through mole drains | DOUBLE | 1 | 0.0 | 20.0 | 0.0 |
| constant | cEndWaterSensitiveDVS | DVS when the crop sensitivity to soil water stress ends | DOUBLE | m | 0.0 | 2.0 | 1.5 |
| constant | cEvapLoops | Water deficit sharing maximum number of loops in the evaporation routine (4=Slim default, set to a high number to ensure evaporation demand is always met) | INT | 1 | 1 | 100 | 100 |
| constant | cEvapRestriction | Water deficit sharing restriction in the evaporation routine: 0=unrestricted; 1=unrestricted in evaporation layer, PCONT/CAPW below; 2=PCONT/CAPW | INT | 1 | 0 | 1 | 0 |
| constant | cEvapSharingDepth | Water deficit sharing depth in the evaporation routine (if cEvapRestriction!=2): 0=evaporation layer; 1=full soil profile | INT | 1 | 0 | 1 | 0 |
| constant | cExtractionMethod | Extraction method: 0 = original SLIM (0.25), 1 = FAO variant, 2 = Feddes variant | INT | 1 | 0 | 1 | 0 |
| constant | cGenAlfa | Parameters alfa for each layer for Van Genuchten equation (only used with Feddes) | DOUBLEARRAY | m-1 | - | - | - |
| constant | cGenN | Parameters n for each layer for Van Genuchten equation (only used with Feddes) | DOUBLEARRAY | 1 | - | - | - |
| constant | cLatitude | Latitude (only needed for Slim evaporation routines) | DOUBLE | ° | -90.0 | 90.0 | 50.7 |
| constant | cMD | Number of layers containing mole drains | INT | 1 | 0 | 1000 | 0 |
| constant | cMaxSoilEvaporationDepth | Maximum soil depth which supplies water for soil evaporation | DOUBLE | m | 0.0 | 20.0 | 0.12 |
| constant | cNominalDepletionNonSensitive | FAO crop specific depletion factor before and after water stress sensitive phase | DOUBLE | m | 0.0 | 1.0 | 0.5 |
| constant | cNominalDepletionSensitive | FAO crop specific depletion factor during water stress sensitive phase | DOUBLE | m | 0.0 | 1.0 | 0.5 |
| constant | cPCONT | Pore continuity. If this is not null, a fixed PCONT is used instead of the Slim PCONT routine (N/A if cEvapRestriction=0) | DOUBLE | 1 | 0.0 | 1.0 | - |
| constant | cSoilLayerDepth | Depth of the bottom of each soil layer after soil layer transformation | DOUBLEARRAY | m | - | - | - |
| constant | cSoilWaterFieldCapacity | Volumetric soil water content of each layer at field capacity (pF2.5 or -33 KPa) | DOUBLEARRAY | m3/m3 | - | - | - |
| constant | cSoilWaterInitial | Volumetric soil water content of each layer at the start of the simulation | DOUBLEARRAY | m3/m3 | - | - | - |
| constant | cSoilWaterReducedThreshold | Volumetric soil water content of each layer at which water is available for upward movement (pF3.3 or 200 KPa) | DOUBLEARRAY | m3/m3 | - | - | - |
| constant | cSoilWaterResidual | Residual soil water content for Van Genuchten equation (only used with Feddes) | DOUBLEARRAY | m3/m3 | - | - | - |
| constant | cSoilWaterSaturation | Volumetric soil water content of each layer at saturation (pF0 or 0.0 KPa) | DOUBLEARRAY | m3/m3 | - | - | - |
| constant | cSoilWaterWiltingPoint | Volumetric soil water content of each layer at permanent wilting point (pF4.2 or -1500 KPa) | DOUBLEARRAY | m3/m3 | - | - | - |
| constant | cStartWaterSensitiveDVS | DVS when the crop becomes especially sensitive to soil water stress | DOUBLE | m | 0.0 | 2.0 | 0.85 |
| constant | cWALIQ | The aliquot size in the rainfall splitting routine (mm) | DOUBLE | mm | 0.0 | 20.0 | 3.0 |
| input | iActualEvaporation | Actual soil evaporation (optional, if null SLIM evaporation routine is used) | DOUBLE | mm | 0.0 | 20.0 | - |
| input | iDVS | actual development stage | DOUBLE | 1 | 0.0 | 3.0 | 0.0 |
| input | iDoInitialize | Switch to re-initialize the model with initial values. | BOOLEAN | 1 | - | - | false |
| input | iFRR | Root restriction factor for water uptake in each soil layer as affected by root age and root density (provided by SlimRoots) | DOUBLEARRAY | 1 | - | - | - |
| input | iMD95 | Number of soil layers containing roots (provided by other SimComponents e.g. SlimRoots) | INT | 1 | 0 | 1000 | 0 |
| input | iPotentialEvaporation | Potential soil evaporation | DOUBLE | mm | 0.0 | 20.0 | - |
| input | iPotentialTranspiration | Potential crop transpiration | DOUBLE | mm | 0.0 | 20.0 | - |
| input | iRAIN | Precipitation | DOUBLE | mm | 0.0 | 20.0 | - |
| input | iWithCrop | Switch to indicate the days of the year where a crop is present | BOOLEAN | 1 | - | - | false |
| state | sCAPS | the proportion of the soil porosity likely to support upward (capillary) movement of solutes in each soil layer | DOUBLEARRAY | 1 | - | - | - |
| state | sCAPW | the proportion of the soil porosity likely to support upward (capillary) movement of water in each soil layer | DOUBLEARRAY | 1 | - | - | - |
| state | sCAWM | Total crop available water in the mobile fraction in each soil layer | DOUBLEARRAY | mm | - | - | - |
| state | sCAWMT | Total crop available water in the mobile fraction over the actual rooting depth | DOUBLE | mm | 0.0 | 2000000.0 | 0.0 |
| state | sCAWR | Total crop available water in the retained fraction in each soil layer | DOUBLEARRAY | mm | - | - | - |
| state | sCAWRT | Total crop available water in the retained fraction over the actual rooting depth | DOUBLE | mm | 0.0 | 2000000.0 | 0.0 |
| state | sCAWT | Total crop available water over the actual rooting depth | DOUBLE | mm | 0.0 | 2000000.0 | 0.0 |
| state | sEXT | Daily limit to extract water from soil | DOUBLEARRAY | 1 | 0.0 | 1.0 | - |
| state | sTAW | Water holding capacity (above WP) of soil over rooted zone (up to layer MD95) | DOUBLE | mm | 0.0 | - | 0.0 |
| state | sTWM | Total amount of mobile water over the soil profile | DOUBLE | mm | 0.0 | 200000.0 | 0.0 |
| state | sTWR | Total amount of retained water over the soil profile | DOUBLE | mm | 0.0 | 200000.0 | 0.0 |
| state | sTWRH | Water holding capacity (above 0.5 WP) of soil over soil profile (defined soil depth) | DOUBLE | mm | 0.0 | - | 0.0 |
| state | sTWRHEvaporationDepth | Water holding capacity (above 0.5 WP) of soil over evaporation zone | DOUBLE | mm | 0.0 | - | 0.0 |
| state | sTWRHRootZone | Water holding capacity (above 0.5 WP) of soil over rooted zone (up to layer MD95) | DOUBLE | mm | 0.0 | - | 0.0 |
| state | sWFR | Amount of less mobile water in each layer not available for upward movement of solutes or water (DUL(i)-AML(i)) | DOUBLEARRAY | mm | - | - | - |
| state | sWHT15R | Retained water below 0.5*wilting point in each layer not available for movement of solutes | DOUBLEARRAY | mm | - | - | - |
| state | sWLM | Total amount of less mobile water (between FC and WP) in each layer | DOUBLEARRAY | mm | - | - | - |
| state | sWM | Daily amount of mobile water (WM) in each soil layer (above FC) (mm) | DOUBLEARRAY | mm | - | - | - |
| state | sWM1S | Amount of mobile water (WM) in the top layer at saturation (mm) | DOUBLE | mm | 0.0 | 20.0 | 10.3 |
| state | sWMBeforeLeaching | Daily amount of mobile water in each soil layer before leaching occurs | DOUBLEARRAY | mm | - | - | - |
| state | sWR | Daily amount of retained water (WR) in each soil layer (between FC and 0.5 WP) (mm) | DOUBLEARRAY | mm | - | - | - |
| state | sWR33 | Amount of retained water in finer pores of each layer available for upward movement of solutes or water (AML(i)-WHT15R(i)) | DOUBLEARRAY | mm | - | - | - |
| state | sWRH | Retained water at field capacity in layer i | DOUBLEARRAY | mm | - | - | - |
| state | sWSEEPcum | Cumulative amount of deep percolation (mm) | DOUBLE | mm | 0.0 | 20000.0 | 0.0 |
| state | sW_out | Water leaving each soil layer by vertical drainage percolating to the layer below | DOUBLEARRAY | mm | - | - | - |
| out | DRYFAC | Dryness factor in each layer (input to SlimRoots) | DOUBLEARRAY | 1 | - | - | - |
| out | EvapoTranspiration | Sum of 'Evaporation' and 'Transpiration' | DOUBLE | mm | 0.0 | 20.0 | 0.0 |
| out | Evaporation | Actual soil evaporation as affected by potential evporation and soil mositure in the upper soil layers | DOUBLE | mm | 0.0 | 20.0 | 0.0 |
| out | THICKL | Layer thickness | DOUBLE | m | 0.001 | 20.0 | 0.0 |
| out | TLW | Sum of mobile and retained water over all soil layers (mm) | DOUBLE | mm | 0.0 | 2000.0 | 0.0 |
| out | TotalCropAvailVolumetricWaterContentPerLayer | Volumetric crop available water content in each soil layer | DOUBLEARRAY | m3/m3 | 0.0 | 50.0 | - |
| out | TotalCropAvailWaterContent | Total crop available water over the actual rooting depth | DOUBLE | mm | 0.0 | - | - |
| out | TotalCropAvailWaterContentPerLayer | Total crop available water per soil layer (mm) | DOUBLEARRAY | mm | 0.0 | - | - |
| out | TotalEvaporation | Cumulative soil evaporation over time | DOUBLE | mm | 0.0 | 2000000.0 | 0.0 |
| out | TotalTranspiration | Cumulative crop transpiration over time | DOUBLE | mm | 0.0 | 2000000.0 | 0.0 |
| out | TotalVolumetricWaterContentFirstLayer | Volumetric total water content in the first layer | DOUBLE | m3/m3 | 0.0 | - | - |
| out | TotalVolumetricWaterContentPerLayer | Volumetric total water content in each soil layer | DOUBLEARRAY | m3/m3 | 0.0 | 0.6 | - |
| out | TotalVolumetricWaterContentUpperLayers | Volumetric total water content over the rooting depth | DOUBLE | m3/m3 | 0.0 | - | - |
| out | TotalWaterContent | Total water content over all soil layers (mm) | DOUBLE | mm | 0.0 | 1000.0 | 0.0 |
| out | TotalWaterContentLowerLayers | Total water content over the soil layers below the root zone in mm | DOUBLE | mm | 0.0 | - | - |
| out | TotalWaterContentPerLayer | Total water content in each soil layer (mm) | DOUBLEARRAY | mm | 0.0 | - | - |
| out | TotalWaterContentUpperLayers | Total water content over the rooting depth in mm | DOUBLE | mm | 0.0 | - | - |
| out | Transpiration | Actual crop transpiration as affected by crop water demand (EVAPC) and crop available soil water (CAWT) | DOUBLE | mm | 0.0 | 20.0 | 0.0 |
| out | WDRAIN | Daily amount of water lost through mole drains (only calculated if MD>-1) | DOUBLE | mm | 0.0 | 2000.0 | - |
| out | WFAST | If cCalculateSurfaceRunoff is TRUE: Daily amount of surface run-off (mm, this)); If FALSE: WFAST is the infiltration excess water by-passing the soil matrix | DOUBLE | mm | 0.0 | 2000.0 | - |
| out | WSEEP | Daily amount of deep percolation (mm) | DOUBLE | mm | 0.0 | 2000.0 | - |
| out | WaterBalance | Daily Water Balance over the soil profile (mm) | DOUBLE | mm | -20000.0 | 20000.0 | 0.0 |