Since many empirical methods measure potential evapotranspiration
and lack of Lysimeter data for all areas, comparison of empirical methods output with evaporation basin data to determine best empirical equation, has grown as a common and reasonable issue.
2005), while actual evapotranspiration (AET) and potential evapotranspiration
(PET) are the normals from 1931-1960 (Leemans and Cramer, 1991).
According to the table, the amount of annual precipitation in all stations located on the shore of Caspian Sea is very greater than the annual potential evapotranspiration
Instructions and Tables for Computing Potential Evapotranspiration
and the Water Balance.
A base run is created by running the water balance model once, with only one input selected for each of the basic input parameters--precipitation, temperature, and soil moisture--and the sub-model for potential evapotranspiration
Where PET is the potential evapotranspiration
(mm/day),[DELTA] is the slop of the saturation vapour pressure temperature curve(mb/[degrees]c),y is the psychrometric constant(mb/[degrees]c),P is the air pressure (mb),E is the elevation of the site(m),[lambda] is the latent heat of evaporation(kj/kg), [T.
Thus, at 90mm deficit, the calculated evapotranspiration was half the potential evapotranspiration
, and at 120mm deficit, the evapotranspiration was assumed to be zero.
2004) evaluated various potential evapotranspiration
equations and different ways of partitioning evaporation between soil evaporation and crop transpiration in DSSAT models and particularly in CROPGRO faba bean (Vicia faba L.
1987), soil decomposition is fastest when precipitation equals potential evapotranspiration
, while soil moisture is assumed optimum when the degree of saturation is midway between permanent wilting point and complete saturation (Cox 2001), and when precipitation/potential evapotranspiration
0 dS/m; and applied water at 80%, 100% and 115% of potential evapotranspiration
Each climate scenario models runoff at a resolution of 5 km by 5 km using daily rainfall and potential evapotranspiration
Soil moisture and air relative humidity are negatively related to insolation, while air temperature and potential evapotranspiration
are positively related.