Watershed evapotranspiration by the combination method

Saxton, K. E.

doi:10.31274/rtd-180813-17314

Cited by 13 publications

(24 citation statements)

References 20 publications

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“…Omaha, Nebraska, satisfied most of these requirements; in particular, there were watershed evapotranspiration data available. These data were obtained by Saxton [1972] from a study of the Treynor basins in western Iowa: five small catchments situated approximately 30 km southeast of North Omaha airport, the location of the rawinsonde data. The catchment used for this study was 0.6 km •' and planted with corn.…”

Section: The Watershedmentioning

confidence: 99%

“…He estimated the actual evapotranspiration by reducing by a certain fraction the potential evapotranspiration, determined either by the Penman equation or from pan evaporation. This fraction was found by using a method [Saxton, 1972] based mainly on the stage of plant growth and the soil moisture content. The model involved certain parameters which were optimized by using river flow, rainfall, and soil moisture data from the basins.…”

Section: The Watershedmentioning

confidence: 99%

“…Because of the apparently mildly stable layer frequently occurring above the surface layer, the minimum recorded potential temperature was thought to be the best estimate of the boundary layer value for the observed height procedures under unstable conditions [Arya, 1975], even though it might have The roughness lengths used in this research are presented in Table 2, together with the regional roughness estimated by Kung [1963] and the roughness for the Treynor basins estimated by Saxton [1972]. The lengths used were in the range between these two estimates but in closer agreement with Saxton's estimates for corn.…”

Section: The Watershedmentioning

confidence: 99%

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Determination of regional evapotranspiration from upper air meteorological data

Mawdsley¹,

Brutsaert²

1977

Water Resources Research

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A procedure, recently proposed by the authors to calculate actual evapotranspiration on the basis of parameterization of the atmospheric boundary layer, was applied for the period April through November 1969–1972 with upper air (‘rawinsonde’) meteorological data from Omaha, Nebraska. The accuracy of the 1‐day, 3‐day, weekly, and monthly evapotranspiration totals was assessed by comparing them to evapotranspiration data estimated by a suitable adjustment of potential evapotranspiration from a nearby catchment in the Treynor basins. Several alternative methods for determining the height of the boundary layer and the wind speed at the top of the boundary layer were used; as a result, seven variations of the basic procedure were tested. The similarity functions for water vapor D were found to be smaller than the corresponding functions for sensible heat C and not equal as was previously assumed. Difficulties were encountered, since published upper air humidity data were in error; nevertheless, the method was reasonably successful on a monthly basis with a correlation coefficient of the order of 0.83 but far less so on a daily basis. The recommended version of the method uses the height of the temperature inversion as an estimate of the boundary layer height and the measured wind as the estimate of the wind speed at the top of the boundary layer.

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Section: The Watershedmentioning

confidence: 99%

Section: The Watershedmentioning

confidence: 99%

Section: The Watershedmentioning

confidence: 99%

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Determination of regional evapotranspiration from upper air meteorological data

Mawdsley¹,

Brutsaert²

1977

Water Resources Research

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“…Also, water held in interception storage is subject to rapid evaporation from solar radiation and wind. The ratio^is computed as: 36 -= 0.672 + 0.0428 Tc + 1.13 x lO"^TcŶ + 1,66 X 10"^Tc^+ 1.7 X 10"^Tc( Saxton, 1972) where Tc is the mean daily air temperature (in degrees C). (Saxton e t a_l.…”

Section: Interceptionmentioning

confidence: 99%

“…The model calculates actual evapotranspiration based on the method developed by Saxton (1972), and modified by Anderson (1975 Potential evapotranspiration (PET) is the main input to the Actual evapotranspiration subroutine, and is used first to evaporate water held in interception storage.…”

Section: Actual Evapotranspirationmentioning

confidence: 99%

Computer modeling of crop response to moisture stress

Ogunlela

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Estimation of regional evaporation for a tallgrass prairie from measurements of properties of the atmospheric boundary layer

Munley¹,

Hipps²

1991

Water Resources Research

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Regional scale latent heat flux (LE) was estimated from rawinsonde soundings of the planetary boundary layer (PBL) over the Konza tailgrass prairie in July 1986. Two approaches were used to calculate LE: similarity theory and an algebraic solution of a conservation equation for water vapor in the PBL. Nine of the soundings were complete. However, the latter five soundings only recovered data for every sixth possible level. The results were compared with estimates made by an array of nine Bowen Ratio surface stations. Similarity theory, using vertically averaged values, produced estimates that were reasonably close to the surface values. However, the use of values at the top of the PBL resulted in large overestimation of the evaporation fluxes. When complete soundings were available, the conservation equation yielded estimates which agreed very well with surface values. The agreement was reduced for incomplete soundings. This is likely related to the sensitivity of the equation to uncertainties in the height of the inversion. Overall, the conservation equation produced estimates in closest agreement with the surface stations. The results suggest that adequate vertical resolution of measured profiles is important for proper estimation of regional surface fluxes.

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Watershed evapotranspiration by the combination method

Abstract: Calibration curves of the Minneapolis-Honeywell Dew Probes Calibration curve for neutron soil moisture probe Typical diurnal patterns of vapor pressure deficits Annual distribution of daily net radiation over grass during 1970

Cited by 13 publications

References 20 publications

Determination of regional evapotranspiration from upper air meteorological data

Determination of regional evapotranspiration from upper air meteorological data

Computer modeling of crop response to moisture stress

Estimation of regional evaporation for a tallgrass prairie from measurements of properties of the atmospheric boundary layer

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