Evapotranspiration - Revision history

Lucian: /* Crop Coefficient Adjustment */

2014-03-18T16:39:31Z

‎Crop Coefficient Adjustment

Lucian: /* Crop Coefficient Adjustment */

2014-03-18T16:27:47Z

‎Crop Coefficient Adjustment

Lucian at 16:18, 18 March 2014

2014-03-18T16:18:25Z

Jauch at 16:01, 8 November 2010

2010-11-08T16:01:30Z

Jauch at 15:51, 8 November 2010

2010-11-08T15:51:05Z

Jauch: /* Potencial Evaporation & Potencial Transpiration */

2010-11-08T15:29:32Z

‎Potencial Evaporation & Potencial Transpiration

Jauch: /* Crop Evapotranspiration */

2010-11-08T15:29:06Z

‎Crop Evapotranspiration

Jauch at 14:02, 8 November 2010

2010-11-08T14:02:24Z

Guillaume: 1 revision

2008-12-03T10:27:04Z

1 revision

130.75.203.27 at 09:01, 17 June 2008

2008-06-17T09:01:57Z

New page

Evaportransipiration is calculated with the 'FAO crop reference evapotranspiration', a standardized Penman-Monteith equation.

All necessary information can be obtained from the FAO website:
[http://www.fao.org/docrep/X0490E/x0490e00.htm#Contents]

← Older revision		Revision as of 16:39, 18 March 2014
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	FOR THIS OPTION TO BE ACTIVE ''potential leaf area index'' MUST BE IN MODULE VEGETATION FILE		FOR THIS OPTION TO BE ACTIVE ''potential leaf area index'' MUST BE IN MODULE VEGETATION FILE
		+
		+	From 'Necessidades de Água e Métodos de Rega', Luis Santos Pereira, 2004 Publicações Europa-América, pg 85-86

	===Crop Coefficient Adjustment related keywords===		===Crop Coefficient Adjustment related keywords===

← Older revision		Revision as of 16:27, 18 March 2014
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	Where <math>LAI_{dense}</math> is the potential LAI (''potential leaf area index'' property see '''[[Module Vegetation]]''')		Where <math>LAI_{dense}</math> is the potential LAI (''potential leaf area index'' property see '''[[Module Vegetation]]''')

		+	FOR THIS OPTION TO BE ACTIVE ''potential leaf area index'' MUST BE IN MODULE VEGETATION FILE

	===Crop Coefficient Adjustment related keywords===		===Crop Coefficient Adjustment related keywords===

← Older revision		Revision as of 16:18, 18 March 2014
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	:<math>K_{c}=K_{c}-[1.0-(\frac{LAI}{LAI_{dense}})^{0.5}]</math>		:<math>K_{c}=K_{c}-[1.0-(\frac{LAI}{LAI_{dense}})^{0.5}]</math>

−		+	Where <math>LAI_{dense}</math> is the potential LAI (''potential leaf area index'' property see '''[[Module Vegetation]]''')
−	Where <math>LAI_{dense}</math> is the potential LAI (''potential leaf area index'' property)

@@ Line 48: / Line 48: @@
 The crop evapotranspiration is calculated using the equation below:
 :<math>CropEvapotrans=RefEvapotrans \times K_{c}</math>
@@ Line 55: / Line 56: @@
 Optionally, if the user has a timeseries or map of measured LAI and Potential LAI (LAI for maximum plant growth), this can be provided using the ''leaf area index'' and ''potential leaf area index'' properties in the Vegetation data file (see '''[[Module Vegetation]]'''). When both properties are provided, the Kc can be "adjusted" using the LAI and Potential LAI. The equation used to adjust the Kc based on the Potential and Actual value of LAI can be seen below:
 :<math>K_{c}=K_{c}-[1.0-(\frac{LAI}{LAI_{dense}})^{0.5}]</math>
 Where <math>LAI_{dense}</math> is the potential LAI (''potential leaf area index'' property)
@@ Line 76: / Line 79: @@
 This is done using LAI (leaf area index), according with the equations below:
 :<math>PotentialTranspiration=CropEvapotrans \times (1.0-e^{-0.463 \times LAI})</math>
 :<math>PotentialEvaporation=CropEvapotrans-PotentialTranspiration</math>

@@ Line 5: / Line 5: @@
 Reference evapotranspiration is an input for MOHID Land and can be provided by user or calculated.
 In any case, a property named ''reference evapotranspiration'' must exist in the Basin data file.
-This property can have a constant value in time, can be set to be calculated or data can be provided with a ''Timeseries'' file, a ''HDF'' file or any other valid input data file (see [[Module FillMatrix]]).
+This property can have a constant value in time, can be set to be calculated or data can be provided with a ''Timeseries'' file, a ''HDF'' file or any other valid input data file (see '''[[Module FillMatrix]]''').
   <beginproperty>
@@ Line 18: / Line 18: @@
 The above example sets a constant reference evapotranspiration of 0.2 mm/h during the entire simulation period.
-To make MOHID Land calculate the reference evapotranspiration, the REMAIN_CONSTANT keyword must be set to 0 (false) and no input data files should be provided. MOHID Land will then calculate the reference evapotranspiration using a set of properties that must be set in the Atmosphere data file (see [[Module Atmosphere]]). Below is an example of the reference evapotranspiration property set to be calculated:
+To make MOHID Land calculate the reference evapotranspiration, the REMAIN_CONSTANT keyword must be set to 0 (false) and no input data files should be provided. MOHID Land will then calculate the reference evapotranspiration using a set of properties that must be set in the Atmosphere data file (see '''[[Module Atmosphere]]'''). Below is an example of the reference evapotranspiration property set to be calculated:
   <beginproperty>
@@ Line 29: / Line 29: @@
   <endproperty>
-Evaportransipiration is calculated with the 'FAO crop reference evapotranspiration', a standardized Penman-Monteith equation.
+Evapotranspiration is calculated using the 'FAO crop reference evapotranspiration' method, a standardized Penman-Monteith equation.
 All necessary information can be obtained from the FAO website:
@@ Line 43: / Line 43: @@
 ==Crop Evapotranspiration==
-If [[Module Vegetation]] is used, then the reference evapotranspiration will be adjusted using a crop coefficient (Kc) that must be provided in the Vegetation data file (''crop coefficient'' property).
+If '''[[Module Vegetation]]''' is used, then the reference evapotranspiration will be adjusted using a crop coefficient (Kc) that must be provided in the Vegetation data file (''crop coefficient'' property).
-The Kc can be provided as a constant value or can came from one of the many input options at the disposal of the user through the [[Module FillMatrix]], like as a timeserie file or as a HDF map, for example.
+The Kc can be provided as a constant value or can came from one of the many input options at the disposal of the user through the '''[[Module FillMatrix]]''', like as a timeserie file or as a HDF map, for example.
 The crop evapotranspiration is calculated using the equation below:
-:<math>CropEvapotrans=RefEvapotrans \times K_{corr}</math>
+:<math>CropEvapotrans=RefEvapotrans \times K_{c}</math>
 ===Crop Coefficient Adjustment===
-Optionally, if the user has a timeseries or map of measured LAI and Potential LAI (LAI for maximum plant growth), this can be provided using the ''leaf area index'' and ''potential leaf area index'' properties in the Vegetation data file (see [[Module Vegetation]]). When both properties are provided, the Kc can be "adjusted" using the LAI and Potential LAI. The equation used can be seen below:
+Optionally, if the user has a timeseries or map of measured LAI and Potential LAI (LAI for maximum plant growth), this can be provided using the ''leaf area index'' and ''potential leaf area index'' properties in the Vegetation data file (see '''[[Module Vegetation]]'''). When both properties are provided, the Kc can be "adjusted" using the LAI and Potential LAI. The equation used to adjust the Kc based on the Potential and Actual value of LAI can be seen below:
 :<math>K_{c}=K_{c}-[1.0-(\frac{LAI}{LAI_{dense}})^{0.5}]</math>
@@ Line 67: / Line 68: @@
   KC_MIN
-The '''DEFAULT_KC_WHEN_LAI_ZERO''' keyword tells that Kcorr must be set to this value when LAI is ZERO. The '''KC_MIN''' keyword tell that if the adjusted value found is lower than it, so the min value will be used instead. It's a good idea provide at least a '''KC_MIN''' value (usually 0.3 for soil without vegetation).
+The '''DEFAULT_KC_WHEN_LAI_ZERO''' keyword tells that Kc must be set to this value when LAI is ZERO. The '''KC_MIN''' keyword tells that if the Kc value found is lower than it, so the min value set by user will be used instead. It's a good idea to provide at least a '''KC_MIN''' value (usually 0.3 for soil without vegetation).
 ==Potencial Evaporation & Potencial Transpiration==
@@ Line 78: / Line 80: @@
 :<math>PotentialEvaporation=CropEvapotrans-PotentialTranspiration</math>
 ==Actual Evapotranspiration==
@@ Line 88: / Line 91: @@
   EvapoTranspiration_Rate_[mm/hour]   => Actual Evapotranspiration rate (actual transpiration + actual evaporation)
-  Potential_Crop_EVTP_[mm/hour]       => Crop Evapotranspiration rate  (reference evapotranspiration rate corrected using Kc)
+  Potential_Crop_EVTP_[mm/hour]       => Crop Evapotranspiration rate   (reference evapotranspiration rate corrected using Kc)
-  Potential_Evaporation_[mm/h]        => Potential Evaporation rate    (only if EVAPOTRANSPIRATION_METHOD = 2)
+  Potential_Evaporation_[mm/h]        => Potential Evaporation rate     (only if EVAPOTRANSPIRATION_METHOD = 2)
-  Potential_Transpiration_[mm/h]      => Potential Transpiration rate  (only if EVAPOTRANSPIRATION_METHOD = 2)
+  Potential_Transpiration_[mm/h]      => Potential Transpiration rate   (only if EVAPOTRANSPIRATION_METHOD = 2)
-  Actual_Evaporation_[mm/h]           => Actual Evaporation rate       (only if EVAPOTRANSPIRATION_METHOD = 2)
+  Actual_Evaporation_[mm/h]           => Actual Evaporation rate        (only if EVAPOTRANSPIRATION_METHOD = 2)
-  Actual_Transpiration_[mm/h]         => Actual Transpiration rate     (only if EVAPOTRANSPIRATION_METHOD = 2)
+  Actual_Transpiration_[mm/h]         => Actual Transpiration rate      (only if EVAPOTRANSPIRATION_METHOD = 2)
   Reference_Evapotranspiration_[mm/h] => Reference Evapotranspiration rate
@@ Line 98: / Line 101: @@
 ==Links==
-*[[Module Basin]]
+*'''[[Module Basin]]'''
-*[[Module FillMatrix]]
+*'''[[Module FillMatrix]]'''
-*[[Module Atmosphere]]
+*'''[[Module Atmosphere]]'''
-*[[Module Vegetation]]
+*'''[[Module Vegetation]]'''

← Older revision	Revision as of 10:27, 3 December 2008
(No difference)