1. bookVolume 67 (2019): Issue 3 (September 2019)
Journal Details
License
Format
Journal
eISSN
1338-4333
First Published
28 Mar 2009
Publication timeframe
4 times per year
Languages
English
access type Open Access

Evaluation and validation of the ASCE standardized reference evapotranspiration equations for a subhumid site in northeastern Austria

Published Online: 26 Jun 2019
Page range: 289 - 296
Received: 08 Jan 2018
Accepted: 30 Oct 2018
Journal Details
License
Format
Journal
eISSN
1338-4333
First Published
28 Mar 2009
Publication timeframe
4 times per year
Languages
English
Abstract

Employing evapotranspiration models is a widely used method to estimate reference evapotranspiration (ETREF) based on weather data. Evaluating such models considering site-specific boundary conditions is recommended to interpret ETREF-calculations in a realistic and substantiated manner. Therefore, we evaluated the ASCE standardized ETREF-equations at a subhumid site in northeastern Austria. We calculated ETREF-values for hourly and daily time steps, whereof the former were processed to sum-of-hourly values. The obtained data were compared to each other and to ET-values measured by a weighing lysimeter under reference conditions. The resulting datasets covered daily data of the years 2004 to 2011.

Sum-of-hourly values correlated well (r2 = 0.978) with daily values, but an RMSE of 0.27 mm specified the differences between the calculation procedures. Comparing the calculations to lysimeter measurements revealed overestimation of small ETREF-values and underestimation of large values. The sum-of-hourly values outperformed the daily values, as r2 of the former was slightly larger and RMSE was slightly smaller. Hence, sum-of-hourly computations delivered the best estimation of ETREF for a single day. Seasonal effects were obvious, with computations and measurements being closest to each other in the summer months.

Keywords

Aboukhaled, A., Alfaro, A., Smith, M., 1982. Lysimeters. In: Irrigation and Drainage Paper 39, FAO, Rome (Italy), 73 p.Search in Google Scholar

Allen, R.G., Smith, M., Perrier, A., Pereira, L.S., 1994. An update for the calculation of reference evapotranspiration. ICID (International Commission on Irrigation and Drainage) Bulletin, 43, 2, 35–92.Search in Google Scholar

Allen, R.G., Pereira, L.S., Raes, D., Smith, M., 1998. Crop evapotranspiration: guidelines for computing crop water requirements. In: Irrigation and drainage paper 56. Food and Agriculture Organization of the United Nations, Rome.Search in Google Scholar

Allen, R.G., Pereira, L.S., Howell, T.A., Jensen, M.E., 2011. Evapotranspiration information reporting: I. Factors governing measurement accuracy. Agricultural Water Management, 98, 899–920.10.1016/j.agwat.2010.12.015Open DOISearch in Google Scholar

ASCE-EWRI, 2005. The ASCE standardized reference evapotranspiration equation. In: Allen, R.G.,Walter, I.A., Elliott, R., Howell, T., Itenfisu, D., Jensen, M. (Eds.): ASCE-EWRI Task committee report. American Society of Civil Engineers, Reston, VA, 171 p.Search in Google Scholar

Berengena, J., Gavilán, P., 2005. Reference evapotranspiration estimation in a highly advective semiarid environment. J. Irrig. Drain. Eng., 131, 2,147–163.10.1061/(ASCE)0733-9437(2005)131:2(147)Search in Google Scholar

Doorenbos, J., Pruitt, W.O., 1977. Guidelines for predicting crop water requirements. In: Irrigation and drainage paper 24. Food and Agriculture Organization of the United Nations, Rome, 175 p.Search in Google Scholar

Garcia, M., Raes, D., Allen, R., Herbas, C., 2004. Dynamics of reference evapotranspiration in the Bolivian highlands (Altiplano). Agric. For. Meteorol., 125, 1–2, 67–82.10.1016/j.agrformet.2004.03.005Search in Google Scholar

Gavilan, P., Berengena, J., Allen, R.G., 2007. Measuring versus estimating net radiation and soil heat flux: Impact on Penman–Monteith reference ET estimates in semiarid regions. Agric. Water Manage., 89, 275–286.10.1016/j.agwat.2007.01.014Search in Google Scholar

Gavilán, P., Estévez J., Berengena J., 2008. Comparison of standardized reference evapotranspiration equations in southern Spain. J. Irrig. Drain. Eng., 134, 1–12.10.1061/(ASCE)0733-9437(2008)134:1(1)Search in Google Scholar

Howell, T.A., Evett, S.R., Schneider, A.D., Dusek, D.A., Copeland, K.S., 2000. Irrigated fescue grass ET compared with calculated reference grass ET. In: Proceedings of 4th National Irrigation Symposium, ASAE, Phoenix, AZ, pp. 228–242.Search in Google Scholar

Irmak, S., Howell, T.A., Allen, R.G., Payero, J.O., Martin, D.L., 2005. Standardized ASCE Penman-Monteith: impact of sum-of-hourly vs. 24-hour timestep computations at reference weather station sites. T. ASEA, 48, 1063–1077.10.13031/2013.18517Search in Google Scholar

Jensen, M.E., Burman, R.D., Allen, R.G., 1990. Evapotranspiration and irrigation water requirements. ASCE Manuals and Reports on Engineering Practice, No. 70. American Society of Civil Engineers, New York.Search in Google Scholar

Nolz, R., Kammerer, G., Cepuder, P., 2013a. Interpretation of lysimeter weighing data affected by wind. J. Plant Nutr. Soil Sci., 176, 200–208.10.1002/jpln.201200342Search in Google Scholar

Nolz, R., Kammerer, G., Cepuder, P., 2013b. Improving interpretation of lysimeter weighing data. Die Bodenkultur: J. Land Manage. Food Environ., 64, 27–35.Search in Google Scholar

Nolz, R., Cepuder, P., Kammerer, G., 2014. Determining soil water-balance components using an irrigated grass lysimeter in NE Austria. J. Plant Nutr. Soil Sci., 177, 237–244.10.1002/jpln.201300335Search in Google Scholar

Nolz, R., Cepuder, P., Eitzinger, J., 2016. Comparison of lysimeter based and calculated ASCE reference evapotranspiration in a subhumid climate. Theor. Appl. Climatol., 124, 315–324.10.1007/s00704-015-1417-ySearch in Google Scholar

Perez, L., Castellvi, F., Martínez-Cob, A., Villalobos, F.J., 2006. A simple parameterization of bulk canopy resistance from climatic variables for estimating hourly evapotranspiration. Hydrol. Process., 20, 515–532.10.1002/hyp.5919Search in Google Scholar

Perera, K.C., Western, A.W., Nawarathna, B., George, B., 2015. Comparison of hourly and daily reference crop evapotranspiration equations across seasons and climate zones in Australia. Agric. Water Manage., 148, 84–96.10.1016/j.agwat.2014.09.016Search in Google Scholar

Trnka, M., Žalud, Z., Eitzinger, J., Dubrovský, M., 2005. Global solar radiation in Central European lowlands estimated by various empirical formulae. Agric. For. Meteorol., 131, 54–76.10.1016/j.agrformet.2005.05.002Search in Google Scholar

Yoder, R.E., Odhiambo, L.O., Wright, W.C., 2005. Evaluation of methods for estimating daily reference crop evapotranspiration at a site in the humid Southeast United States. Appl. Eng. Agric., 21, 2, 197–202.10.13031/2013.18153Open DOISearch in Google Scholar

Recommended articles from Trend MD

Plan your remote conference with Sciendo