SlideShare a Scribd company logo
Evaporation
• Terminology
– Evaporation – process by which liquid
water passes directly to the vapor phase
– Transpiration - process by which liquid
water passes from liquid to vapor through
plant metabolism
– Sublimation - process by which water
passes directly from the solid phase to the
vapor phase
Factors Influencing Evaporation
• Energy supply for
vaporization (latent heat)
– Solar radiation
• Transport of vapor away from
evaporative surface
– Wind velocity over surface
– Specific humidity gradient
above surface
• Vegetated surfaces
– Supply of moisture to the
surface
– Evapotranspiration (ET)
• Potential Evapotranspiration
(PET) – moisture supply is not
limited
n
R
E
Net radiation
Evaporation
Air Flow
u
Evaporation from a Water
Surface
• Simplest form of evaporation
– From free liquid of permanently saturated
surface
Evaporation from a Pan
• National Weather Service Class A
type
• Installed on a wooden platform in a
grassy location
• Filled with water to within 2.5 inches
of the top
• Evaporation rate is measured by
manual readings or with an analog
output evaporation gauge
h
Area, A
CS
w

a

AE
m w
v 


dt
dh
E 

n
R
s
H
Sensible
heat to air
Net radiation Vapor flow rate
Heat conducted
to ground
G
Methods of Estimating Evaporation
• Energy Balance Method
• Aerodynamic method
• Combined method
Wind as a Factor in Evaporation
• Wind has a major effect on evaporation, E
– Wind removes vapor-laden air by convection
– This Keeps boundary layer thin
– Maintains a high rate of water transfer from
liquid to vapor phase
– Wind is also turbulent
• Convective diffusion is several orders of magnitude
larger than molecular diffusion
Evapotranspiration
• Evapotranspiration
– Combination of evaporation from soil surface and
transpiration from vegetation
– Governing factors
• Energy supply and vapor transport
• Supply of moisture at evaporative surfaces
– Reference crop
• 8-15 cm of healthy growing green grass with abundant water
– Combo Method works well if B is calibrated to local
conditions

More Related Content

Similar to Evaporation.ppt

water resources engineering
water resources engineeringwater resources engineering
water resources engineering
SRIKANTH SAMUDRALA
 
AS Geography (AQA) - Rivers
AS Geography (AQA) - RiversAS Geography (AQA) - Rivers
AS Geography (AQA) - Rivers
lordvoldermort123
 
Chapter 1
Chapter 1Chapter 1
Hydrologic cycle and field water balance
Hydrologic cycle and field water balance Hydrologic cycle and field water balance
Hydrologic cycle and field water balance
dathan cs
 
Estimation of Evapotranspiration.pdf
Estimation of Evapotranspiration.pdfEstimation of Evapotranspiration.pdf
Estimation of Evapotranspiration.pdf
PraveenJ578
 
Hydrologyical cycle lesson 1
Hydrologyical cycle lesson 1Hydrologyical cycle lesson 1
Hydrologyical cycle lesson 1
Ms Geoflake
 
Introduction to Hydrology
Introduction to HydrologyIntroduction to Hydrology
Introduction to Hydrology
DivakarPamanji
 
Evaporation
EvaporationEvaporation
Evaporation
AsmarudDin
 
Abstractions of precipitation ppt
Abstractions of precipitation pptAbstractions of precipitation ppt
Abstractions of precipitation ppt
pradeepkumawat4142
 
Lecture4(hydro)
Lecture4(hydro)Lecture4(hydro)
Lecture4(hydro)
mltan4
 
Hydrology
HydrologyHydrology
Hydrology
1396Surjeet
 
Lecture Three on evaporation and evapotranspiration
Lecture Three on evaporation and evapotranspirationLecture Three on evaporation and evapotranspiration
Lecture Three on evaporation and evapotranspiration
Getachew563258
 
Evapotranspiration
EvapotranspirationEvapotranspiration
Evapotranspiration
Jannat Iftikhar
 
Evaporation and transpiration for hydrology subject
Evaporation and transpiration for hydrology subjectEvaporation and transpiration for hydrology subject
Evaporation and transpiration for hydrology subject
Muhammad Sultan
 
Evaporation: a key component of water cycle
Evaporation: a key component of water cycleEvaporation: a key component of water cycle
Evaporation: a key component of water cycle
BahramKhan20
 
Measurement and estimation of different environmental variables
Measurement and estimation of different environmental variablesMeasurement and estimation of different environmental variables
Measurement and estimation of different environmental variables
PMAS Arid Agriculture University Rawalpindi, Pakistan
 
Evaporation (1).ppt
Evaporation (1).pptEvaporation (1).ppt
Evaporation (1).ppt
PapuKumarNaik1
 
1.1 drainage basin system
1.1 drainage basin system1.1 drainage basin system
1.1 drainage basin system
Kylie Kemp
 
Soil, plant and meteorological factors determining water needs of crops
Soil, plant and meteorological factors determining water needs of cropsSoil, plant and meteorological factors determining water needs of crops
Soil, plant and meteorological factors determining water needs of crops
KhileshKumarsahu
 
Hydrologic cycle
Hydrologic cycleHydrologic cycle
Hydrologic cycle
yarrakula
 

Similar to Evaporation.ppt (20)

water resources engineering
water resources engineeringwater resources engineering
water resources engineering
 
AS Geography (AQA) - Rivers
AS Geography (AQA) - RiversAS Geography (AQA) - Rivers
AS Geography (AQA) - Rivers
 
Chapter 1
Chapter 1Chapter 1
Chapter 1
 
Hydrologic cycle and field water balance
Hydrologic cycle and field water balance Hydrologic cycle and field water balance
Hydrologic cycle and field water balance
 
Estimation of Evapotranspiration.pdf
Estimation of Evapotranspiration.pdfEstimation of Evapotranspiration.pdf
Estimation of Evapotranspiration.pdf
 
Hydrologyical cycle lesson 1
Hydrologyical cycle lesson 1Hydrologyical cycle lesson 1
Hydrologyical cycle lesson 1
 
Introduction to Hydrology
Introduction to HydrologyIntroduction to Hydrology
Introduction to Hydrology
 
Evaporation
EvaporationEvaporation
Evaporation
 
Abstractions of precipitation ppt
Abstractions of precipitation pptAbstractions of precipitation ppt
Abstractions of precipitation ppt
 
Lecture4(hydro)
Lecture4(hydro)Lecture4(hydro)
Lecture4(hydro)
 
Hydrology
HydrologyHydrology
Hydrology
 
Lecture Three on evaporation and evapotranspiration
Lecture Three on evaporation and evapotranspirationLecture Three on evaporation and evapotranspiration
Lecture Three on evaporation and evapotranspiration
 
Evapotranspiration
EvapotranspirationEvapotranspiration
Evapotranspiration
 
Evaporation and transpiration for hydrology subject
Evaporation and transpiration for hydrology subjectEvaporation and transpiration for hydrology subject
Evaporation and transpiration for hydrology subject
 
Evaporation: a key component of water cycle
Evaporation: a key component of water cycleEvaporation: a key component of water cycle
Evaporation: a key component of water cycle
 
Measurement and estimation of different environmental variables
Measurement and estimation of different environmental variablesMeasurement and estimation of different environmental variables
Measurement and estimation of different environmental variables
 
Evaporation (1).ppt
Evaporation (1).pptEvaporation (1).ppt
Evaporation (1).ppt
 
1.1 drainage basin system
1.1 drainage basin system1.1 drainage basin system
1.1 drainage basin system
 
Soil, plant and meteorological factors determining water needs of crops
Soil, plant and meteorological factors determining water needs of cropsSoil, plant and meteorological factors determining water needs of crops
Soil, plant and meteorological factors determining water needs of crops
 
Hydrologic cycle
Hydrologic cycleHydrologic cycle
Hydrologic cycle
 

More from PapuKumarNaik1

Ch 14 short version directly from 14th New Edition saved 14 Feb 2012 and 15 A...
Ch 14 short version directly from 14th New Edition saved 14 Feb 2012 and 15 A...Ch 14 short version directly from 14th New Edition saved 14 Feb 2012 and 15 A...
Ch 14 short version directly from 14th New Edition saved 14 Feb 2012 and 15 A...
PapuKumarNaik1
 
chapter-24.ppty5y54y645654645645645y5t55
chapter-24.ppty5y54y645654645645645y5t55chapter-24.ppty5y54y645654645645645y5t55
chapter-24.ppty5y54y645654645645645y5t55
PapuKumarNaik1
 
112408.pptfgfgfdgfdgfgffgfgffffffgfdgddffg
112408.pptfgfgfdgfdgfgffgfgffffffgfdgddffg112408.pptfgfgfdgfdgfgffgfgffffffgfdgddffg
112408.pptfgfgfdgfdgfgffgfgffffffgfdgddffg
PapuKumarNaik1
 
hplc2.pptjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
hplc2.pptjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjhplc2.pptjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
hplc2.pptjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
PapuKumarNaik1
 
Org Stru.pptgfdgrdgrtgrrrtrtrrrrrrryryre
Org Stru.pptgfdgrdgrtgrrrtrtrrrrrrryryreOrg Stru.pptgfdgrdgrtgrrrtrtrrrrrrryryre
Org Stru.pptgfdgrdgrtgrrrtrtrrrrrrryryre
PapuKumarNaik1
 
Wilhelmi-UR-Boulder (1h8776565,n8t7).pptx
Wilhelmi-UR-Boulder (1h8776565,n8t7).pptxWilhelmi-UR-Boulder (1h8776565,n8t7).pptx
Wilhelmi-UR-Boulder (1h8776565,n8t7).pptx
PapuKumarNaik1
 
noaa_csc1231455445156555455656666566.ppt
noaa_csc1231455445156555455656666566.pptnoaa_csc1231455445156555455656666566.ppt
noaa_csc1231455445156555455656666566.ppt
PapuKumarNaik1
 
Biomass-1cgygiopiooooou9u9897678978y8.ppt
Biomass-1cgygiopiooooou9u9897678978y8.pptBiomass-1cgygiopiooooou9u9897678978y8.ppt
Biomass-1cgygiopiooooou9u9897678978y8.ppt
PapuKumarNaik1
 
05 Biomass3de455ver44fa ewr4 er454 dfgr.ppt
05 Biomass3de455ver44fa ewr4 er454 dfgr.ppt05 Biomass3de455ver44fa ewr4 er454 dfgr.ppt
05 Biomass3de455ver44fa ewr4 er454 dfgr.ppt
PapuKumarNaik1
 
hydrogen_senator_dorgan_rrrrt18nov04.ppt
hydrogen_senator_dorgan_rrrrt18nov04.ppthydrogen_senator_dorgan_rrrrt18nov04.ppt
hydrogen_senator_dorgan_rrrrt18nov04.ppt
PapuKumarNaik1
 
Sound-or-Noise-Pollution-1detailsoutpptx
Sound-or-Noise-Pollution-1detailsoutpptxSound-or-Noise-Pollution-1detailsoutpptx
Sound-or-Noise-Pollution-1detailsoutpptx
PapuKumarNaik1
 
noisepollutionpresentationexamoledetails
noisepollutionpresentationexamoledetailsnoisepollutionpresentationexamoledetails
noisepollutionpresentationexamoledetails
PapuKumarNaik1
 
Communication.ppt
Communication.pptCommunication.ppt
Communication.ppt
PapuKumarNaik1
 
chapter14.ppt
chapter14.pptchapter14.ppt
chapter14.ppt
PapuKumarNaik1
 
1624851192.pptx
1624851192.pptx1624851192.pptx
1624851192.pptx
PapuKumarNaik1
 
ENVIRONMENTAL EDUCATION.ppt
ENVIRONMENTAL  EDUCATION.pptENVIRONMENTAL  EDUCATION.ppt
ENVIRONMENTAL EDUCATION.ppt
PapuKumarNaik1
 
smog.ppt
smog.pptsmog.ppt
smog.ppt
PapuKumarNaik1
 
Global Warming.ppt
Global Warming.pptGlobal Warming.ppt
Global Warming.ppt
PapuKumarNaik1
 
ACID BASES AND SALTS.ppt
ACID BASES AND SALTS.pptACID BASES AND SALTS.ppt
ACID BASES AND SALTS.ppt
PapuKumarNaik1
 
Solutions ppt.pptx
Solutions ppt.pptxSolutions ppt.pptx
Solutions ppt.pptx
PapuKumarNaik1
 

More from PapuKumarNaik1 (20)

Ch 14 short version directly from 14th New Edition saved 14 Feb 2012 and 15 A...
Ch 14 short version directly from 14th New Edition saved 14 Feb 2012 and 15 A...Ch 14 short version directly from 14th New Edition saved 14 Feb 2012 and 15 A...
Ch 14 short version directly from 14th New Edition saved 14 Feb 2012 and 15 A...
 
chapter-24.ppty5y54y645654645645645y5t55
chapter-24.ppty5y54y645654645645645y5t55chapter-24.ppty5y54y645654645645645y5t55
chapter-24.ppty5y54y645654645645645y5t55
 
112408.pptfgfgfdgfdgfgffgfgffffffgfdgddffg
112408.pptfgfgfdgfdgfgffgfgffffffgfdgddffg112408.pptfgfgfdgfdgfgffgfgffffffgfdgddffg
112408.pptfgfgfdgfdgfgffgfgffffffgfdgddffg
 
hplc2.pptjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
hplc2.pptjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjhplc2.pptjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
hplc2.pptjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
 
Org Stru.pptgfdgrdgrtgrrrtrtrrrrrrryryre
Org Stru.pptgfdgrdgrtgrrrtrtrrrrrrryryreOrg Stru.pptgfdgrdgrtgrrrtrtrrrrrrryryre
Org Stru.pptgfdgrdgrtgrrrtrtrrrrrrryryre
 
Wilhelmi-UR-Boulder (1h8776565,n8t7).pptx
Wilhelmi-UR-Boulder (1h8776565,n8t7).pptxWilhelmi-UR-Boulder (1h8776565,n8t7).pptx
Wilhelmi-UR-Boulder (1h8776565,n8t7).pptx
 
noaa_csc1231455445156555455656666566.ppt
noaa_csc1231455445156555455656666566.pptnoaa_csc1231455445156555455656666566.ppt
noaa_csc1231455445156555455656666566.ppt
 
Biomass-1cgygiopiooooou9u9897678978y8.ppt
Biomass-1cgygiopiooooou9u9897678978y8.pptBiomass-1cgygiopiooooou9u9897678978y8.ppt
Biomass-1cgygiopiooooou9u9897678978y8.ppt
 
05 Biomass3de455ver44fa ewr4 er454 dfgr.ppt
05 Biomass3de455ver44fa ewr4 er454 dfgr.ppt05 Biomass3de455ver44fa ewr4 er454 dfgr.ppt
05 Biomass3de455ver44fa ewr4 er454 dfgr.ppt
 
hydrogen_senator_dorgan_rrrrt18nov04.ppt
hydrogen_senator_dorgan_rrrrt18nov04.ppthydrogen_senator_dorgan_rrrrt18nov04.ppt
hydrogen_senator_dorgan_rrrrt18nov04.ppt
 
Sound-or-Noise-Pollution-1detailsoutpptx
Sound-or-Noise-Pollution-1detailsoutpptxSound-or-Noise-Pollution-1detailsoutpptx
Sound-or-Noise-Pollution-1detailsoutpptx
 
noisepollutionpresentationexamoledetails
noisepollutionpresentationexamoledetailsnoisepollutionpresentationexamoledetails
noisepollutionpresentationexamoledetails
 
Communication.ppt
Communication.pptCommunication.ppt
Communication.ppt
 
chapter14.ppt
chapter14.pptchapter14.ppt
chapter14.ppt
 
1624851192.pptx
1624851192.pptx1624851192.pptx
1624851192.pptx
 
ENVIRONMENTAL EDUCATION.ppt
ENVIRONMENTAL  EDUCATION.pptENVIRONMENTAL  EDUCATION.ppt
ENVIRONMENTAL EDUCATION.ppt
 
smog.ppt
smog.pptsmog.ppt
smog.ppt
 
Global Warming.ppt
Global Warming.pptGlobal Warming.ppt
Global Warming.ppt
 
ACID BASES AND SALTS.ppt
ACID BASES AND SALTS.pptACID BASES AND SALTS.ppt
ACID BASES AND SALTS.ppt
 
Solutions ppt.pptx
Solutions ppt.pptxSolutions ppt.pptx
Solutions ppt.pptx
 

Recently uploaded

world-environment-day-2024-240601103559-14f4c0b4.pptx
world-environment-day-2024-240601103559-14f4c0b4.pptxworld-environment-day-2024-240601103559-14f4c0b4.pptx
world-environment-day-2024-240601103559-14f4c0b4.pptx
mfasna35
 
原版制作(Manitoba毕业证书)曼尼托巴大学毕业证学位证一模一样
原版制作(Manitoba毕业证书)曼尼托巴大学毕业证学位证一模一样原版制作(Manitoba毕业证书)曼尼托巴大学毕业证学位证一模一样
原版制作(Manitoba毕业证书)曼尼托巴大学毕业证学位证一模一样
mvrpcz6
 
Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...
Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...
Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...
Joshua Orris
 
BASIC CONCEPT OF ENVIRONMENT AND DIFFERENT CONSTITUTENET OF ENVIRONMENT
BASIC CONCEPT OF ENVIRONMENT AND DIFFERENT CONSTITUTENET OF ENVIRONMENTBASIC CONCEPT OF ENVIRONMENT AND DIFFERENT CONSTITUTENET OF ENVIRONMENT
BASIC CONCEPT OF ENVIRONMENT AND DIFFERENT CONSTITUTENET OF ENVIRONMENT
AmitKumar619042
 
PACKAGING OF FROZEN FOODS ( food technology)
PACKAGING OF FROZEN FOODS  ( food technology)PACKAGING OF FROZEN FOODS  ( food technology)
PACKAGING OF FROZEN FOODS ( food technology)
Addu25809
 
Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...
Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...
Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...
Joshua Orris
 
Kinetic studies on malachite green dye adsorption from aqueous solutions by A...
Kinetic studies on malachite green dye adsorption from aqueous solutions by A...Kinetic studies on malachite green dye adsorption from aqueous solutions by A...
Kinetic studies on malachite green dye adsorption from aqueous solutions by A...
Open Access Research Paper
 
RoHS stands for Restriction of Hazardous Substances, which is also known as t...
RoHS stands for Restriction of Hazardous Substances, which is also known as t...RoHS stands for Restriction of Hazardous Substances, which is also known as t...
RoHS stands for Restriction of Hazardous Substances, which is also known as t...
vijaykumar292010
 
Improving the viability of probiotics by encapsulation methods for developmen...
Improving the viability of probiotics by encapsulation methods for developmen...Improving the viability of probiotics by encapsulation methods for developmen...
Improving the viability of probiotics by encapsulation methods for developmen...
Open Access Research Paper
 
Lessons from operationalizing integrated landscape approaches
Lessons from operationalizing integrated landscape approachesLessons from operationalizing integrated landscape approaches
Lessons from operationalizing integrated landscape approaches
CIFOR-ICRAF
 
快速办理(Calabria毕业证书)卡拉布里亚大学毕业证在读证明一模一样
快速办理(Calabria毕业证书)卡拉布里亚大学毕业证在读证明一模一样快速办理(Calabria毕业证书)卡拉布里亚大学毕业证在读证明一模一样
快速办理(Calabria毕业证书)卡拉布里亚大学毕业证在读证明一模一样
astuz
 
在线办理(lboro毕业证书)拉夫堡大学毕业证学历证书一模一样
在线办理(lboro毕业证书)拉夫堡大学毕业证学历证书一模一样在线办理(lboro毕业证书)拉夫堡大学毕业证学历证书一模一样
在线办理(lboro毕业证书)拉夫堡大学毕业证学历证书一模一样
pjq9n1lk
 
Biomimicry in agriculture: Nature-Inspired Solutions for a Greener Future
Biomimicry in agriculture: Nature-Inspired Solutions for a Greener FutureBiomimicry in agriculture: Nature-Inspired Solutions for a Greener Future
Biomimicry in agriculture: Nature-Inspired Solutions for a Greener Future
Dr. P.B.Dharmasena
 
Environment Conservation Rules 2023 (ECR)-2023.pptx
Environment Conservation Rules 2023 (ECR)-2023.pptxEnvironment Conservation Rules 2023 (ECR)-2023.pptx
Environment Conservation Rules 2023 (ECR)-2023.pptx
neilsencassidy
 
原版制作(Newcastle毕业证书)纽卡斯尔大学毕业证在读证明一模一样
原版制作(Newcastle毕业证书)纽卡斯尔大学毕业证在读证明一模一样原版制作(Newcastle毕业证书)纽卡斯尔大学毕业证在读证明一模一样
原版制作(Newcastle毕业证书)纽卡斯尔大学毕业证在读证明一模一样
p2npnqp
 
Wildlife-AnIntroduction.pdf so that you know more about our environment
Wildlife-AnIntroduction.pdf so that you know more about our environmentWildlife-AnIntroduction.pdf so that you know more about our environment
Wildlife-AnIntroduction.pdf so that you know more about our environment
amishajha2407
 

Recently uploaded (16)

world-environment-day-2024-240601103559-14f4c0b4.pptx
world-environment-day-2024-240601103559-14f4c0b4.pptxworld-environment-day-2024-240601103559-14f4c0b4.pptx
world-environment-day-2024-240601103559-14f4c0b4.pptx
 
原版制作(Manitoba毕业证书)曼尼托巴大学毕业证学位证一模一样
原版制作(Manitoba毕业证书)曼尼托巴大学毕业证学位证一模一样原版制作(Manitoba毕业证书)曼尼托巴大学毕业证学位证一模一样
原版制作(Manitoba毕业证书)曼尼托巴大学毕业证学位证一模一样
 
Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...
Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...
Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...
 
BASIC CONCEPT OF ENVIRONMENT AND DIFFERENT CONSTITUTENET OF ENVIRONMENT
BASIC CONCEPT OF ENVIRONMENT AND DIFFERENT CONSTITUTENET OF ENVIRONMENTBASIC CONCEPT OF ENVIRONMENT AND DIFFERENT CONSTITUTENET OF ENVIRONMENT
BASIC CONCEPT OF ENVIRONMENT AND DIFFERENT CONSTITUTENET OF ENVIRONMENT
 
PACKAGING OF FROZEN FOODS ( food technology)
PACKAGING OF FROZEN FOODS  ( food technology)PACKAGING OF FROZEN FOODS  ( food technology)
PACKAGING OF FROZEN FOODS ( food technology)
 
Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...
Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...
Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...
 
Kinetic studies on malachite green dye adsorption from aqueous solutions by A...
Kinetic studies on malachite green dye adsorption from aqueous solutions by A...Kinetic studies on malachite green dye adsorption from aqueous solutions by A...
Kinetic studies on malachite green dye adsorption from aqueous solutions by A...
 
RoHS stands for Restriction of Hazardous Substances, which is also known as t...
RoHS stands for Restriction of Hazardous Substances, which is also known as t...RoHS stands for Restriction of Hazardous Substances, which is also known as t...
RoHS stands for Restriction of Hazardous Substances, which is also known as t...
 
Improving the viability of probiotics by encapsulation methods for developmen...
Improving the viability of probiotics by encapsulation methods for developmen...Improving the viability of probiotics by encapsulation methods for developmen...
Improving the viability of probiotics by encapsulation methods for developmen...
 
Lessons from operationalizing integrated landscape approaches
Lessons from operationalizing integrated landscape approachesLessons from operationalizing integrated landscape approaches
Lessons from operationalizing integrated landscape approaches
 
快速办理(Calabria毕业证书)卡拉布里亚大学毕业证在读证明一模一样
快速办理(Calabria毕业证书)卡拉布里亚大学毕业证在读证明一模一样快速办理(Calabria毕业证书)卡拉布里亚大学毕业证在读证明一模一样
快速办理(Calabria毕业证书)卡拉布里亚大学毕业证在读证明一模一样
 
在线办理(lboro毕业证书)拉夫堡大学毕业证学历证书一模一样
在线办理(lboro毕业证书)拉夫堡大学毕业证学历证书一模一样在线办理(lboro毕业证书)拉夫堡大学毕业证学历证书一模一样
在线办理(lboro毕业证书)拉夫堡大学毕业证学历证书一模一样
 
Biomimicry in agriculture: Nature-Inspired Solutions for a Greener Future
Biomimicry in agriculture: Nature-Inspired Solutions for a Greener FutureBiomimicry in agriculture: Nature-Inspired Solutions for a Greener Future
Biomimicry in agriculture: Nature-Inspired Solutions for a Greener Future
 
Environment Conservation Rules 2023 (ECR)-2023.pptx
Environment Conservation Rules 2023 (ECR)-2023.pptxEnvironment Conservation Rules 2023 (ECR)-2023.pptx
Environment Conservation Rules 2023 (ECR)-2023.pptx
 
原版制作(Newcastle毕业证书)纽卡斯尔大学毕业证在读证明一模一样
原版制作(Newcastle毕业证书)纽卡斯尔大学毕业证在读证明一模一样原版制作(Newcastle毕业证书)纽卡斯尔大学毕业证在读证明一模一样
原版制作(Newcastle毕业证书)纽卡斯尔大学毕业证在读证明一模一样
 
Wildlife-AnIntroduction.pdf so that you know more about our environment
Wildlife-AnIntroduction.pdf so that you know more about our environmentWildlife-AnIntroduction.pdf so that you know more about our environment
Wildlife-AnIntroduction.pdf so that you know more about our environment
 

Evaporation.ppt

  • 1. Evaporation • Terminology – Evaporation – process by which liquid water passes directly to the vapor phase – Transpiration - process by which liquid water passes from liquid to vapor through plant metabolism – Sublimation - process by which water passes directly from the solid phase to the vapor phase
  • 2. Factors Influencing Evaporation • Energy supply for vaporization (latent heat) – Solar radiation • Transport of vapor away from evaporative surface – Wind velocity over surface – Specific humidity gradient above surface • Vegetated surfaces – Supply of moisture to the surface – Evapotranspiration (ET) • Potential Evapotranspiration (PET) – moisture supply is not limited n R E Net radiation Evaporation Air Flow u
  • 3. Evaporation from a Water Surface • Simplest form of evaporation – From free liquid of permanently saturated surface
  • 4. Evaporation from a Pan • National Weather Service Class A type • Installed on a wooden platform in a grassy location • Filled with water to within 2.5 inches of the top • Evaporation rate is measured by manual readings or with an analog output evaporation gauge h Area, A CS w  a  AE m w v    dt dh E   n R s H Sensible heat to air Net radiation Vapor flow rate Heat conducted to ground G
  • 5. Methods of Estimating Evaporation • Energy Balance Method • Aerodynamic method • Combined method
  • 6. Wind as a Factor in Evaporation • Wind has a major effect on evaporation, E – Wind removes vapor-laden air by convection – This Keeps boundary layer thin – Maintains a high rate of water transfer from liquid to vapor phase – Wind is also turbulent • Convective diffusion is several orders of magnitude larger than molecular diffusion
  • 7. Evapotranspiration • Evapotranspiration – Combination of evaporation from soil surface and transpiration from vegetation – Governing factors • Energy supply and vapor transport • Supply of moisture at evaporative surfaces – Reference crop • 8-15 cm of healthy growing green grass with abundant water – Combo Method works well if B is calibrated to local conditions