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Last updated: 03/03/08
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HYD151
Field Methods in Hydrology
WEEK 8
Lecture 18: Evapotranspiration Measurement
Outline:
Evaporation measurement
Direct- lysimeters, pan evaporation, air moisture profiling
Indirect- mass transfer empirical methods
Evaporation by energy balance approach
evaporative heat flux
sensible heat flux
net radiation
soil heat storage
Bown Ratio
Evapotranspiriation estimation
Bowen Ratio
Penmen-Monteith equation
Textbook reading:
Other reading:
Hsiao, T.C. 1990. Crop water requirement and productivity. Proceedings of the 5th International Conference on Irrigation, Tel-Aviv, Israel.download here
"Evaporation and Energy balance" handoutdownload here
Related web links:
Lecture 19: Forest Water Balance
Outline:
Mass balance approach to measuring evapotranspiration
Interception
Throughfall
Stemflow
Textbook reading:
Other reading:
Solar Light Company, Inc. Radiometer Specification Guide. Application Note 113.download here
Hygometrix, Inc. 2004. A Comparison of Relative Humidity Sensing Technologies. Application Note 2004-2. Alpine, CA.download here
Related web links:
Lecture 20: Plot-scale water balance and soil physics
Outline:
Plot water balance equations
Vadose zone concepts
Volume and mass relationships in soils
Forces acting on soil
Instruments for measuring soil moisture
Instruments for measuring matric potential
Soil water retention curves
Saturated versus unsaturated hydraulic conductivity
Textbook reading:
Chapter 12: pages 207-223
Other reading:
Related web links:
Infiltration/Soil Moisture Equipment Demonstration
Outline:
Demonstration of tensiometers, soil-water samplers, neutron probe, TDR, unsaturated hydraulic conductivity measurement.
Other reading:
none.
Here is a useful reference:
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