potential evapotranspiration


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potential evapotranspiration

[pə′ten·chəl i‚vap·ō‚tranz·pə′rā·shən]
(hydrology)
Generally, the amount of moisture which, if available, would be removed from a given land area by evapotranspiration; expressed in units of water depth.
References in periodicals archive ?
After defining the potential evapotranspiration of the crop (ETc) by the variation in the volumetric moisture levels in the soil layers, crop coefficients (Kc) were defined by the ratio between ETc and reference evapotranspiration (ET0) obtained by the FAO-56 Penman-Monteith method (Allen et al., 1998).
In order to compare results from empirical methods with pan data, the following diagrams are used: According to table 2 and figure 1, best method to measure monthly potential evapotranspiration is determinable.
To run the described model, it is necessary to obtain precipitation, temperature and potential evapotranspiration series, as well as the geomorphological characterization of the basin to compute the monthly 0[degrees]C isotherm elevation.
Takeuchi, "Estimating potential evapotranspiration using Shuttleworth-Wallace model and NOAA-AVHRR NDVI data to feed a distributed hydrological model over the Mekong River basin," Journal of Hydrology, vol.
K, as an empirical coefficient transferring the pan evaporation to potential evapotranspiration, and is calibrated alone firstly.
Monthly average of potential evapotranspiration E[T.sub.o], relative humidity, radiation, temperature and total precipitation between 2008 and 2010 on a pear crop cv.
Potential evapotranspiration, E[T.sub.o], that is evaporation in plants that is used to calculate the need of water, can be calculated using CropWat computer model [5].
Various factors, like vegetation cover, soil cover, precipitation, potential evapotranspiration, soil texture, desertification potential, land forms and land use attributes were used to identify the land degradation problems in each soil geomorphologic unit.
This index is based on cumulative value of precipitation and potential evapotranspiration. The advantage of RDI, when compared to SPI, is that it uses potential evapotranspiration in addition to precipitation and meteorological drought is therefore better represented.
The rate at which the water is removed out of the soil depends on the energy available for moisture extraction, expressed in terms of potential evapotranspiration. NSM uses longitude and latitude information to obtain potential evapotranspiration following the Thornthwaite equation (Thornthwaite & Mather, 1957).
Despite popular perceptions that northern Australia has a surplus of water, the research found the extremely seasonal climate with continuously high temperatures meant that the landscape was annually water-limited, with little or no rain for three to six months every year, and very high potential evapotranspiration rates.
In the present study, despite the net radiation differences, potential evapotranspiration for the sample without plants was 0.039 lb/[ft.sup.2]h (0.19 kg/([m.sup.2]h)) or 41 Btu/h [ft.sup.2] (128 W/[m.sup.2]) during the second day of experiments.

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