SVERIGES LANTBRUKSUNIVERSITET - Epsilon Open Archive - SLU
SVERIGES LANTBRUKSUNIVERSITET - Epsilon Open Archive - SLU
SVERIGES LANTBRUKSUNIVERSITET - Epsilon Open Archive - SLU
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irrigation management and to carry further research on the water<br />
movement in the soil-plant-atmosphere system.<br />
5. Summary<br />
Recently, reliable and relatively low cost infrared temperature<br />
sensors have become available, allowing the practical determination of<br />
sensible and latent heat fluxes over homogeneous terrains. The<br />
appropriate micrometeorological theory uses the energy balance and<br />
aerodynamic equations to calculate actual water loss from the surface.<br />
Automated weather stations can be equipped to monitor actual<br />
evaporation in stead of using lysimeters or other sophisticated<br />
research methods that require great care and maintenance.<br />
Routine estimates of site-specific actual evapotranspiration for<br />
different crops is essential for the study of the water balance of<br />
soil and plants. Obtained from many locations at representative sites<br />
this information, together with the standard meteorological data could<br />
also be used in real time by the information systems that serve the<br />
farmer.<br />
6. References<br />
Brutsaert, W. 1982: Evaporation in to the Atmosphere, Theory, History<br />
and Applications. Reidel, Dordrecht, Holland, 299 pp.<br />
Kustas, W.P., B.J. Choudhury, M.S. Moran, R.J. Reginato, R.D.<br />
Jackson, L.W. Gay, H.L. Weaver, 1989: Determination of sensible<br />
heat flux over spar se canopy using thermal infrared data.<br />
Agric.For. Met., 44, 197-216.<br />
Launiainen, 1983: Parametrization of the water vapour flux over a<br />
water surface by the bulk aerodynamic method. Annales<br />
Geophysicae, 6, 481-492.<br />
Tanner, C.B., 1960:. Energy balance approach to evapotranspiration<br />
from crops. Soil Sci.Soc. Am.Proc., 24, 1-9.