An evaluation of two hourly reference evapotranspiration equations for semiarid conditions

López-Urrea, R.; Olalla, F. Martı́n de Santa; Fabeiro, C.; Moratalla, A.

doi:10.1016/j.agwat.2006.05.017

Cited by 92 publications

(43 citation statements)

References 7 publications

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“…López-Urrea et al (2006) found a good agreement of Penman-Monteith with lysimeter data on an hourly basis. Vaughan et al (2007) also reported a good accordance of hourly lysimeter measurements with a Penman-Monteith approach of the California Irrigation Management Information System.…”

Section: Introductionmentioning

confidence: 57%

Actual evapotranspiration and precipitation measured by lysimeters: a comparison with eddy covariance and tipping bucket

Gebler¹,

Franssen²,

Pütz³

et al. 2015

Hydrol. Earth Syst. Sci.

148

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Abstract. This study compares actual evapotranspiration (ET a ) measurements by a set of six weighable lysimeters, ET a estimates obtained with the eddy covariance (EC) method, and evapotranspiration calculated with the full-form Penman-Monteith equation (ET PM ) for the Rollesbroich site in the Eifel (western Germany). The comparison of ET a measured by EC (including correction of the energy balance deficit) and by lysimeters is rarely reported in the literature and allows more insight into the performance of both methods. An evaluation of ET a for the two methods for the year 2012 shows a good agreement with a total difference of 3.8 % (19 mm) between the ET a estimates. The highest agreement and smallest relative differences (< 8 %) on a monthly basis between both methods are found in summer. ET a was close to ET PM , indicating that ET was energy limited and not limited by water availability. ET a differences between lysimeter and EC were mainly related to differences in grass height caused by harvest and the EC footprint. The lysimeter data were also used to estimate precipitation amounts in combination with a filter algorithm for the high-precision lysimeters recently introduced by Peters et al. (2014). The estimated precipitation amounts from the lysimeter data differ significantly from precipitation amounts recorded with a standard rain gauge at the Rollesbroich test site. For the complete year 2012 the lysimeter records show a 16 % higher precipitation amount than the tipping bucket. After a correction of the tipping bucket measurements by the method of Richter (1995) this amount was reduced to 3 %. With the help of an onsite camera the precipitation measurements of the lysimeters were analyzed in more detail. It was found that the lysimeters record more precipitation than the tipping bucket, in part related to the detection of rime and dew, which contribute 17 % to the yearly difference between both methods. In addition, fog and drizzle explain an additional 5.5 % of the total difference. Larger differences are also recorded for snow and sleet situations. During snowfall, the tipping bucket device underestimated precipitation severely, and these situations contributed also 7.9 % to the total difference. However, 36 % of the total yearly difference was associated with snow cover without apparent snowfall, and under these conditions snow bridges and snow drift seem to explain the strong overestimation of precipitation by the lysimeter. The remaining precipitation difference (about 33 %) could not be explained and did not show a clear relation to wind speed. The variation of the individual lysimeters devices compared to the lysimeter mean are small, showing variations up to 3 % for precipitation and 8 % for evapotranspiration.

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Section: Introductionmentioning

confidence: 57%

Actual evapotranspiration and precipitation measured by lysimeters: a comparison with eddy covariance and tipping bucket

Gebler¹,

Franssen²,

Pütz³

et al. 2015

Hydrol. Earth Syst. Sci.

148

View full text Add to dashboard Cite

show abstract

“…Hence, mathematical models are commonly used for estimating ET c over the entire range of crop development stages. Many studies show that the Penman-Monteith equation is able to estimate ET o from weather data under diverse climatic conditions with a reasonable accuracy (Amatya et al, 1995;Ventura et al, 1999;Irmak et al, 2008;Temesgen et al, 2005;Yoder et al, 2005;Lopez-Urrea et al, 2006). Several Penman-Monteith (Monteith, 1965)-type combination-based energy balance modeling approaches have been employed to estimate ET c by separately taking into account soil surface and plant canopy conditions.…”

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confidence: 99%

Evaluation of the impact of surface residue cover on single and dual crop coefficient for estimating soybean actual evapotranspiration

Odhiambo

Irmak

2012

Agricultural Water Management

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“…A range of resolution between 0.02 mm and 0.05 mm is required to obtain hourly ET c rates (Dugas et al, 1985;Howell et al, 1985;Schneider et al, 1998;Girona et al, 2004;López-Urrea et al, 2006a). Malone et al (2000) proposed a maximum relative error of 10% for hourly ET c estimations, implying that for the lysimeter reported here a threshold ET c of 0.56 mm hour -1 is required to obtain reliable hourly values.…”

Section: Measurement Resolutionmentioning

confidence: 99%

Design and construction of a large weighing lysimeter in an almond orchard

Lorite

Santos

Testi

et al. 2012

Span. j. agric. res.

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Effective water management is essential to ensure the sustainability of irrigated agriculture. The accurate determination of crop water requirements is the first step in this task. This paper describes the building of a one-tree weighing lysimeter (3m x 3m and 2.15m depth) located in an almond orchard (Prunus dulcis “Guara”), inside the experimental farm “Alameda del Obispo” in Córdoba, Spain, to measure orchard evapotranspiration (ETc). Following a review on lysimetry, the description of the construction of the weighing lysimeter is provided in detail, including considerations relative to system resolution and wind effects on the measurements. Finally, some preliminary results of the evaporation and transpiration of young almond trees are presented demonstrating that lysimetry in orchards provides accurate ET values needed to determine irrigation water requirements.

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An evaluation of two hourly reference evapotranspiration equations for semiarid conditions

Cited by 92 publications

References 7 publications

Actual evapotranspiration and precipitation measured by lysimeters: a comparison with eddy covariance and tipping bucket

Actual evapotranspiration and precipitation measured by lysimeters: a comparison with eddy covariance and tipping bucket

Evaluation of the impact of surface residue cover on single and dual crop coefficient for estimating soybean actual evapotranspiration

Design and construction of a large weighing lysimeter in an almond orchard

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