Procedures to Develop a Standardized Reference Evapotranspiration Zone Map

Mancosu, Noemi; Snyder, Richard L.; Spano, Donatella

doi:10.1061/(asce)ir.1943-4774.0000697

Cited by 16 publications

(12 citation statements)

References 47 publications

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“…A preliminary attempt in PET mapping was presented by Foyster [54], and followed by several publications where different spatial interpolation methods have been applied [55][56][57][58][59], with satisfying performance. In a recent study, Tegos et al [25] illustrated that the inverse distance method (IDW) was the most efficient than other interpolation techniques, i.e., Kriging, Bilinear Surface Smoothing and Natural Neighbours.…”

Section: Spatial Interpolation Of Optimized Parametersmentioning

confidence: 99%

Parametric Modelling of Potential Evapotranspiration: A Global Survey

Tegos

Malamos

Efstratiadis

et al. 2017

Water

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Abstract:We present and validate a global parametric model of potential evapotranspiration (PET) with two parameters that are estimated through calibration, using as explanatory variables temperature and extraterrestrial radiation. The model is tested over the globe, taking advantage of the Food and Agriculture Organization (FAO CLIMWAT) database that provides monthly averaged values of meteorological inputs at 4300 locations worldwide. A preliminary analysis of these data allows for explaining the major drivers of PET over the globe and across seasons. The model calibration against the given Penman-Monteith values was carried out through an automatic optimization procedure. For the evaluation of the model, we present global maps of optimized model parameters and associated performance metrics, and also contrast its performance against the well-known Hargreaves-Samani method. Also, we use interpolated values of the optimized parameters to validate the predictive capacity of our model against monthly meteorological time series, at several stations worldwide. The results are very encouraging, since even with the use of abstract climatic information for model calibration and the use of interpolated parameters as local predictors, the model generally ensures reliable PET estimations. Exceptions are mainly attributed to irregular interactions between temperature and extraterrestrial radiation, as well as because the associated processes are influenced by additional drivers, e.g., relative humidity and wind speed. However, the analysis of the residuals shows that the model is consistent in terms of parameters estimation and model validation. The parameter maps allow for the direct use of the model wherever in the world, providing PET estimates in case of missing data, that can be further improved even with a short term acquisition of meteorological data.

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Section: Spatial Interpolation Of Optimized Parametersmentioning

confidence: 99%

Parametric Modelling of Potential Evapotranspiration: A Global Survey

Tegos

Malamos

Efstratiadis

et al. 2017

Water

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“…However, two main methodological frameworks emerged for the interpolation of ET0 (McVicar et al, 2007): (i) interpolation of the forcing data and then calculation of ET0, or (ii) calculation of ET0 at every weather station followed by an interpolation of ET0 onto the grid. Here, we follow the first approach and combine it with methods proposed by Tegos et al (2015) and Mancosu et al (2014) which use spatially interpolated ET0 model parameters. Gridded data of minimum and maximum temperatures are used as forcing fields for the application of the Hargreaves formulation of ET0.…”

Section: Introductionmentioning

confidence: 99%

Creating long-term gridded fields of reference evapotranspiration in Alpine terrain based on a recalibrated Hargreaves method

Haslinger¹,

Bartsch²

2016

Hydrol. Earth Syst. Sci.

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Abstract.A new approach for the construction of highresolution gridded fields of reference evapotranspiration for the Austrian domain on a daily time step is presented. Gridded data of minimum and maximum temperatures are used to estimate reference evapotranspiration based on the formulation of Hargreaves. The calibration constant in the Hargreaves equation is recalibrated to the Penman-Monteith equation in a monthly and station-wise assessment. This ensures, on one hand, eliminated biases of the Hargreaves approach compared to the formulation of Penman-Monteith and, on the other hand, also reduced root mean square errors and relative errors on a daily timescale. The resulting new calibration parameters are interpolated over time to a daily temporal resolution for a standard year of 365 days. The overall novelty of the approach is the use of surface elevation as the only predictor to estimate the recalibrated Hargreaves parameter in space. A third-order polynomial is fitted to the recalibrated parameters against elevation at every station which yields a statistical model for assessing these new parameters in space by using the underlying digital elevation model of the temperature fields. With these newly calibrated parameters for every day of year and every grid point, the Hargreaves method is applied to the temperature fields, yielding reference evapotranspiration for the entire grid and time period from 1961-2013. This approach is opening opportunities to create high-resolution reference evapotranspiration fields based only temperature observations, but being as close as possible to the estimates of the Penman-Monteith approach.

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“…The paper finally presents an on-farm controller device driven by simulation models that can be used for a solid set sprinkler system, in order to reduce the effects of meteorological conditions on wind drift and evaporation losses. The opportunities and the limitation of their different alternatives, according to sitespecific conditions, are illustrated and discussed.A methodology to derive standardized reference evapotranspiration zone maps by daily climate data and GIS is proposed in the paper by Mancosu et al (2014) that describes its application for Sardinia region (Italy). The characterization of irrigated zones by class of reference evapotranspiration open the window to evaluate crop water requirements on large areas and/or to investigate the impact of climate change.…”

mentioning

confidence: 99%

“…A methodology to derive standardized reference evapotranspiration zone maps by daily climate data and GIS is proposed in the paper by Mancosu et al (2014) that describes its application for Sardinia region (Italy). The characterization of irrigated zones by class of reference evapotranspiration open the window to evaluate crop water requirements on large areas and/or to investigate the impact of climate change.…”

mentioning

confidence: 99%

“…However, further research is necessary in order to verify the representativeness of the approach and to extend the validity of the results to field conditions. The paper of Pascual-Seva et al (2014) describes the effect of planting strategies and irrigation systems on yield and water use efficiency of chufa, a typical crop in Valencia area (Spain). In particular, three planting strategies, considering ridges with a plant row and flat raised beds with two or three plant rows, under furrow and drip irrigation were studied for two years.…”

mentioning

confidence: 99%

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Special Issue on Trends and Challenges of Sustainable Irrigated Agriculture

Provenzano

Sinobas

2014

J. Irrig. Drain Eng.

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In the twenty-first century, the shortage of freshwater is one of the most important environmental concerns facing several regions of the world because of the growing demand of increasing population, agricultural intensification, and economic growth. Global climate change will contribute to exacerbate the problem, generating new drought-prone areas and increasing those already characterized by severe aridity.Worldwide it is estimated that, on average, agriculture accounts for 70% of the total water consumption, compared with 10% for domestic consume and the remaining used by industry. Moreover, according to FAO estimates, by 2050 agricultural production has to increase by 60% to satisfy the demands for food and feed (FAO 2013). Within this context, it is necessary to think back and make effective policies and actions for enhancing rational land use planning and agricultural inputs for a better exploitation of the existing technologies, even to rise the farmers' awareness on the consequences of water scarcity.Sustainable agriculture must therefore be prescribed as a policy approach to maximize production while maintaining environmental quality in a fragile and quite stressed environment Cammalleri et al. 2013b). It requires the conversion of current agricultural practices toward systems more productive and resilient to climate variability, in which land, water, and other inputs would be more efficiently used, and crops yield would be less variable. Heading forward to achieve these goals, short-and long-term strategies across different and integrated pathways are required. These would have to keep in mind issues such as food security and agricultural development, and take into account the existing environmental constrains.According to FAO (2013), climate-smart agriculture (CSA) would be an integrated approach to achieve the goals of a sustainable development. It addresses the food security and climate challenges issues within the economic, social, and environmental dimensions of sustainable development.Considering that in irrigated agriculture, water resources (both quantity and quality) are one of the major environmental constrains, which will intensify in the future, there is a priority for water management agents and stakeholders to consider its use sustainable. Thus, it is required and no longer postponed to improve technologies and approaches to optimize water use at different scales (farm, field, district, and higher).On the one hand, it is necessary to increase the performance of irrigation systems, and on the other hand, it is crucial to adopt technologies for irrigation scheduling aimed to increase water use efficiency, avoiding wastes and losses.This special issue reports the results of some research presented in the session 11.3. Soil and Irrigation Sustainability Practices, at the European Geoscience Union general assembly, held in Vienna in 2012, related, as summarized below, to applications of on-farm control sensors aimed to increase effectiveness of irrigation, to methodologies for improving agroh...

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Procedures to Develop a Standardized Reference Evapotranspiration Zone Map

Cited by 16 publications

References 47 publications

Parametric Modelling of Potential Evapotranspiration: A Global Survey

Parametric Modelling of Potential Evapotranspiration: A Global Survey

Creating long-term gridded fields of reference evapotranspiration in Alpine terrain based on a recalibrated Hargreaves method

Special Issue on Trends and Challenges of Sustainable Irrigated Agriculture

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