Automation of a Class A Evaporation Pan

1985 ◽  
Vol 28 (1) ◽  
pp. 169-171 ◽  
Author(s):  
James M. McKinion ◽  
Anthony Trent
Keyword(s):  
Class A ◽  
Evaporation Pan

The energy balance of a US Class A evaporation pan

2013 ◽  
Vol 182-183 ◽  
pp. 314-331 ◽  
Author(s):  
Wee Ho Lim ◽  
Michael L. Roderick ◽  
Michael T. Hobbins ◽  
Suan Chin Wong ◽  
Graham D. Farquhar
Keyword(s):  
Energy Balance ◽  
Class A ◽  
Evaporation Pan

scholarly journals EVAPOTRANSPIRATION FROM ALFALFA AS RELATED TO EVAPORATION AND OTHER METEOROLOGICAL VARIABLES

1966 ◽  
Vol 46 (3) ◽  
pp. 271-277 ◽  
Author(s):  
E. H. Hobbs ◽  
K. K. Krogman
Keyword(s):  
Vapor Pressure ◽  
Meteorological Data ◽  
Correlation Coefficients ◽  
Meteorological Variables ◽  
Simple Correlation ◽  
Class A ◽  
Evaporation Pan

Evapotranspiration from irrigated alfalfa was related to evaporation from a Class A evaporation pan, an Experimental Farms buried tank, and a Bellani plate atmometer in addition to the meteorological variables temperature, sunshine, wind, and vapor pressure. Except for the evapotranspiration–wind relationship all simple correlation coefficients were significant when the crop was growing vigorously and completely shaded the ground.Although wind alone did not correlate significantly with either evaporation or evapotranspiration, it contributed appreciably when considered in combination with other meteorological variables. The limitations of simple correlation must be recognized in developing formulas intended for estimating evapotranspiration from meteorological data.

scholarly journals Estudio del proceso de evaporación en el Salar Tres Quebradas por medio de medidas in situ y datos de satélite

2019 ◽  
pp. 1
Author(s):  
F. Carmona ◽  
R. Rivas ◽  
A.M.G. Faramiñán ◽  
C. Mancino ◽  
M. Bayala ◽  
...  
Keyword(s):  
Satellite Data ◽  
Landsat 8 ◽  
Flow Models ◽  
Spectral Signatures ◽  
Class A ◽  
Salt Flats ◽  
Level Function ◽  
Evaporation Pan ◽  
Numerical Flow Modeling

<p>The calculation of evaporation (<em>Ev</em>) is a fundamental process on the planning of investment for nonmetallic mining in salt flats. Dispose to reliable estimates of evaporation allows to reduce one of the main uncertainties of the flow models in this type of basin. This paper focuses on the calculation of <em>Ev</em> in the Tres Quebradas salt flat, Catamarca (Argentina), applying Priestley-Taylor model whit satellite data. Study area comprises the Tres Quebradas and Verde lagoons, and a central evaporite zone. Satellite data (CERES and OLI-LandSat 8), meteorological information, brine density measurements, evaporation measurements, and spectral signatures to calculations were used. The lagoons evaporation was estimated and by means of a Class A evaporation pan validated. The evaporation control in evaporite zones also was studied using a phreatic level function. <em>Ev</em> values of 1302 mm year<sup>–1</sup> and 1249 mm year<sup>–1</sup> for the Tres Quebradas and Verde lagoons were obtained, respectively, similar to Class A evaporation pan values measured. In the case of evaporite zones, an average annual value of 152 mm year<sup>–1</sup> was estimated, regulated by the phreatic level. In summary, an average annual of system water loss by evaporation of 1.31±0.32 m<sup>3</sup> s<sup>–1</sup> was obtained, where more than 80% corresponds to the Tres Quebradas and Verde lagoons, and the rest to the central evaporite zone. The results achieved are consistent and will be used as input data in the numerical flow modeling to the estimation of the lithium brine reserve of the salt flats.</p>

A Cheap Weighable Container for Measuring Evaporation from Alfalfa in the Sudan

1965 ◽  
Vol 1 (2) ◽  
pp. 99-106 ◽  
Author(s):  
A. T. A/Hafeez ◽  
J. P. Hudson
Keyword(s):  
Free Water ◽  
Leading Edge ◽  
Water Losses ◽  
Class A ◽  
Water Surfaces ◽  
Evaporation Pan ◽  
Dry Out

SUMMARYTen weighable containers, the same size as 4-gallon petrol tins, were located in a plot 80 metres from the leading edge of a 2-acre field of irrigated alfalfa growing under advective conditions in the Sudan. Evapo-transpiration from alfalfa growing in these containers was compared with evaporation from a series of small evaporimeters level with the top of the plants and from a standard U.S. Class A evaporation pan, and also with estimates of evaporation calculated by the Penman formula. Evaporation from the free water surfaces in evaporimeters or pan was always greater than from alfalfa in the containers when the crop was 25 cm. high or less, but lower when the crop was more than that height, whilst the figures calculated by the Penman formula were much lower than either. Cumulative water losses were also recorded from containers where the soil was kept wet or allowed to dry out, and these were compared with evaporimeter losses up to the stage where no further water was being lost from the dry containers.

Evaporation Rate of a White Class A Evaporation Pan

2016 ◽  
Vol 142 (6) ◽  
pp. 04016018 ◽  
Author(s):  
Chia-Ren Chu ◽  
Ming-Hsu Li ◽  
Chien-Han Chen ◽  
Jih-Shun Liu
Keyword(s):  
Evaporation Rate ◽  
Class A ◽  
Evaporation Pan

RESPOSTA DA PRODUTIVIDADE DE HÍBRIDOS DE MILHO CULTIVADO EM DIFERENTES ESTRATÉGIAS DE IRRIGAÇÃO

Irriga ◽  
2010 ◽  
Vol 15 (1) ◽  
pp. 36-50 ◽  
Author(s):  
Fatima Cibele Soares ◽  
Marcia Xavier Peiter ◽  
Adroaldo Dias Robaina ◽  
Ana Rita Costenaro Parizi ◽  
Cleiton José Ramão ◽  
...  
Keyword(s):  
Zea Mays ◽  
Yield Components ◽  
Zea Mays L ◽  
Irrigation System ◽  
Irrigation Management ◽  
Corn Hybrids ◽  
Management Culture ◽  
Class A ◽  
Final Yield ◽  
Evaporation Pan

O aumento da produtividade das áreas cultivadas no Rio Grande do Sul deve-se principalmente ao uso de sistemas de irrigação. Porém, o manejo inadequado destes sistemas pode ser um fator limitante à produção das culturas irrigadas e dentre os elementos a serem considerados para um eficiente controle de regas, pode-se destacar o indicador de déficit hídrico que pode ser via solo, planta ou através da estimativa da demanda evaporativa da atmosfera. Este trabalho teve por objetivo avaliar a produtividade de dois híbridos de milho cultivados sob estratégias de irrigação com diferentes indicadores e lâminas, no município de Jaguari, RS. Os tratamentos constaram de três diferentes estratégias de irrigação: T1 - sensores dielétricos de umidade do solo, T2 - 100% de reposição da evaporação de Tanque Classe A e T3 - 80% de reposição da evaporação de Tanque Classe A. Os híbridos de milho testados foram: BM 1201 e BRS 3150, utilizando-se um sistema de irrigação do tipo mini-pivô central. Na colheita determinou-se os componentes de produção, que foram submetidos a análise de variância e comparação de médias. Os manejos de irrigação influenciaram nos componentes de produção e no rendimento final dos dois híbridos testados. O híbrido BRS 3150 apresentou maior produtividade comparado ao híbrido BM 1201 para as estratégias com sensores de umidade de solo e reposição de 80% da evaporação do Tanque Classe A, sendo que para a estratégia de 100% da evaporação do Tanque Classe A, o híbrido BM 1201 apresentou maior produção.   UNITERMOS: Zea mays L., manejo de irrigação, parâmetros de cultura, rendimento de grãos     SOARES, F.C.; PEITER, M.X.; ROBAINA, A.D.; PARIZI, A.R.C.; RAMÃO, C.J; VIVAN, G.A. MAIZE HYBRIDS PRODUCTIVITY RESPONSE, CULTIVATED UNDER DIFFERENT IRRIGATION STRATEGIES     2 ABSTRACT   This work aimed to evaluate the yield of two corn hybrids cultivated under different irrigation strategies, in Jaguari, RS, Brazil. Treatments consisted of three different irrigation strategies: T1 - measurement sensors of soil moisture, T2 - replacement of 100% of evaporation of Class A Evaporation Pan and T3 - replacement of 80% of evaporation of Class A Evaporation Pan. The tested corn hybrids were BM 1201 and BRS 3150. The experiment was bifactorial, and a central mini-pivot irrigation system was used. At harvest time,  the plants were located in a stove at 65ºC, until reaching constant mass and yield components were determined. Data were analyzed through the analyses of variance and mean comparison, (Tukey's test) at 5%. The irrigation management influenced the yield components and the final yield of the two tested hybrids; the hybrid BRS 3150 presented a greater productivity compared to the hybrid BM 1201 for measurement sensors of humidity and replacement of 80% of evaporation of Class A Evaporation Pan, whereas the hybrid BM 1202 had bigger production for the replacement of  100% of evaporation of Class A Evaporation Pan.   KEYWORDS: Zea mays L., irrigation management, culture parameters, grain yield.  

scholarly journals Evaluation of evaporation-measuring equipments for estimating evapotranspiration within a greenhouse

2004 ◽  
Vol 8 (2-3) ◽  
pp. 184-188 ◽  
Author(s):  
Flávio F. Blanco ◽  
Marcos V. Folegatti
Keyword(s):  
Evaporation Rate ◽  
Growing Season ◽  
Water Evaporation ◽  
Crop Evapotranspiration ◽  
Class A ◽  
Daily Water ◽  
Evaporation Pan ◽  
Monteith Equation ◽  
Class A Pan

With the objective of evaluating the performance of simple evaporation measuring equipments in estimating the evapotranspiration in greenhouse, an experiment was conducted in Piracicaba, SP, during a tomato-growing season. Daily water evaporation rate from Piche atmometer, modified atmometer and a reduced evaporation pan installed inside the greenhouse and a Class A pan installed outside were compared to the evapotranspiration rates calculated with Penman-Monteith equation. Results showed that atmometers had the best performance in estimating the crop evapotranspiration in greenhouse and could be used advantageously in relation to the evaporation pans.

Automating a class a evaporation pan for semi-continuous recording

1981 ◽  
Vol 25 ◽  
pp. 275-281 ◽  
Author(s):  
G. Asrar ◽  
R.J. Kunze ◽  
D.E. Linvill
Keyword(s):  
Continuous Recording ◽  
Class A ◽  
Evaporation Pan
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