Reference Evapotranspiration Estimation in a Highly Advective Semiarid Environment

Berengena, J.; Jiménez-Gavilán, Pablo

doi:10.1061/(asce)0733-9437(2005)131:2(147)

Cited by 143 publications

(86 citation statements)

References 17 publications

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“…In those conditions horizontal advection of sensible heat supplied by the dry upwind terrain tends to enhance evapotranspiration Berengena and Gavilán, 2005). The physics behind advection is still not solved entirely.…”

Section: Discussionmentioning

confidence: 99%

Reference crop evapotranspiration derived from geo-stationary satellite imagery: a case study for the Fogera flood plain, NW-Ethiopia and the Jordan Valley, Jordan

Bruin

Trigo

Jitan

et al. 2010

Hydrol. Earth Syst. Sci.

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Abstract.First results are shown of a project aiming to estimate daily values of reference crop evapotranspiration ET 0 from geo-stationary satellite imagery. In particular, for Woreta, a site in the Ethiopian highland at an elevation of about 1800 m, we tested a radiation-temperature based approximate formula proposed by Makkink (MAK), adopting ET 0 evaluated with the version of the Penman-Monteith equation described in the FAO Irrigation and Drainage paper 56 as the most accurate estimate. More precisely we used the latter with measured daily solar radiation as input (denoted by PMFAO-Rs). Our data set for Woreta concerns a period where the surface was fully covered with short green non-stressed vegetation. Our project was carried out in the context of the Satellite Application Facility on Land Surface Analysis (LANDSAF) facility. Among others, the scope of LANDSAF is to increase benefit from the EUMETSAT Satellite Meteosat Second Generation (MSG). In this study we applied daily values of downward solar radiation at the surface obtained from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) radiometer. In addition, air temperature at 2 m was obtained from 3-hourly forecasts provided by the European Centre for Medium-Range Weather Forecasts (ECMWF).Both MAK and PMFAO-Rs contain the psychrometric "constant", which is proportional to air pressure, which, in turn, decreases with elevation. In order to test elevation effects we tested MAK and its LANDSAF input data for 2 sites in the Jordan Valley located about 250 m b.s.l.Correspondence to: H. A. R. de Bruin (hardb@xs4all.nl) Except for a small underestimation of air temperature at the Ethiopian site at 1800 m, the first results of our LANDSAF-ET 0 project are promising. If our approach to derive ET 0 proves successfully, then the LANDSAF will be able to initiate nearly real time free distribution of ET 0 for the full MSG disk.

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Section: Discussionmentioning

confidence: 99%

Reference crop evapotranspiration derived from geo-stationary satellite imagery: a case study for the Fogera flood plain, NW-Ethiopia and the Jordan Valley, Jordan

Bruin

Trigo

Jitan

et al. 2010

Hydrol. Earth Syst. Sci.

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“…Daily changes in mass (kg) were converted to equivalent water depths (mm) to obtain daily ET. The outputs were obtained as the average of 120 readings taken every 2 s over a 4-min period centered at the respective sampling times, so that fluctuations in weight due to wind friction on the lysimeter surface were smoothed (Berengena and Gavilán, 2005). Only measured ET from days with precipitation below 0.2 mm were used for comparison purposes.…”

Section: Weighing Lysimetermentioning

confidence: 99%

Integration of vegetation indices into a water balance model to estimate evapotranspiration of wheat and corn

Padilla

González‐Dugo

Jiménez-Gavilán

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. Vegetation indices (VIs) have been traditionally used for quantitative monitoring of vegetation. Remotely sensed radiometric measurements of visible and infrared solar energy, which is reflected or emitted by plant canopies, can be used to obtain rapid, non-destructive estimates of certain canopy attributes and parameters. One parameter of special interest for water management applications, is the crop coefficient employed by the FAO-56 model to derive actual crop evapotranspiration (ET). The aim of this study was to evaluate a methodology that combines the basal crop coefficient derived from VIs with a daily soil water balance in the root zone to estimate daily evapotranspiration rates for corn and wheat crops at field scale. The ability of the model to trace water stress in these crops was also assessed. Vegetation indices were first retrieved from field hand-held radiometer measurements and then from Landsat 5 and 7 satellite images. The results of the model were validated using two independent measurement systems for ET and regular soil moisture monitoring, in order to evaluate the behavior of the soil and atmosphere components of the model. ET estimates were compared with latent heat flux measured by an eddy covariance system and with weighing lysimeter measurements. Average overestimates of daily ET of 8 and 11% were obtained for corn and wheat, respectively, with good agreement between the estimated and measured root-zone water deficit for both crops when field radiometry was employed. When the satellite sensor data replaced the field radiometry data the overestimation figures slightly changed to 9 and 6% for the same two crops. The model was also used to monitor the water stress during the 2009 growing season, detecting several periods of water stress in both crops. Some of these stresses occurred during stages like grain filling, whenCorrespondence to: F. L. M. Padilla (franciscol.munoz@juntadeandalucia.es) the water stress is know to have a negative effect on yield. This fact could explain the lower yield reached compared to local yield statistics for wheat and corn. The results showed that the model can be used to calculate the water requirements of these crops in irrigated areas and that its ability to monitor water stress deserves further research.

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“…These methods are indicators of model performance according to Fox (1981), Willmott (1982), Douglas et al (2009), Berengena and Gavilan (2005), Alexandris et al (2008), Pogen et al (2016), and Dash and Khatua (2016). These statistical measures and the regression equations were evaluated using their optimal values as benchmarks.…”

Section: Evaluation Of Empirical Model Performancementioning

confidence: 99%

Evaluation of empirical models for estimating reference-evapotranspiration (RET-ET) in humid semi-hot equatorial coastal climate

Ologhadien¹,

Nwaogazie²

2017

Int. J. Water Res. Environ. Eng.

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Reference Evapotranspiration Estimation in a Highly Advective Semiarid Environment

Cited by 143 publications

References 17 publications

Reference crop evapotranspiration derived from geo-stationary satellite imagery: a case study for the Fogera flood plain, NW-Ethiopia and the Jordan Valley, Jordan

Reference crop evapotranspiration derived from geo-stationary satellite imagery: a case study for the Fogera flood plain, NW-Ethiopia and the Jordan Valley, Jordan

Integration of vegetation indices into a water balance model to estimate evapotranspiration of wheat and corn

Evaluation of empirical models for estimating reference-evapotranspiration (RET-ET) in humid semi-hot equatorial coastal climate

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