Comparison of different empirical methods for estimating ddaily reference evapotranspiration in the humid cold climate (case study: Borujen, Shahrekord, Koohrang and Lordegan)

Journal of Water Science & Engineering

مقاله 2، دوره 6، شماره 14، شهریور 2016، صفحه 21-38   

نوع مقاله: Original Article

نویسندگان

Kobra KheiriShalamzari^* ؛ Amir SoltaniMohammadi

چکیده

The proposed method for calculation of potential evapotranspiration is Penman-Monteith FAO method, but there are other methods that require less meteorological data but estimates close to the FAO Penman-Monteith method in different climatic conditions.  Performance evaluation of these methods on the same basis is prerequisite for selecting an alternative approach in accordance with available data. In this study, daily values of potential evapotranspiration in the period of 21 years (1994-2015) estimated using empirical methods ;Copais, Turc, Hargreaves-Samani, Hargreaves, Ritchie, Irmak  and three forms of  Valiantzas equation  for Borujen,  Shahrekord, Koohrang and Lordegan, located in humid cold climate region of Chaharmahal and Bakhtiary province and values were compared with Penman-Monteith FAO method. To compare the results, the root mean square error, error absolute value and coefficient of determination was used. The results show that the equations of Irmak and Valiantzas (RS, T,RH,U ) performs better than the other empirical methods in four stations and the Hargreaves method showed very poor estimation of evapotranspiration than FAO Penman-Monteith method with 92.25 percent relative error. Also, comparison of total potential  evapotranspiration estimated with empirical methods determined that equation of  Irmak and  Valiantzas (Rs, T, RH, U) for all the stations were the most efficient way.

کلیدواژه‌ها

Reference evapotranspiration؛ Empirical methods؛ Humid cold climate؛ Valiantzas

مراجع

تفضلی، ف .(1385) .ارزیابی حساسیت مدلهای برآورد تبخیر و تعرق به تابش ورودی روزانه در شرایط اقلیمی همدان . پایان  نامه کارشناسی ارشد گروه مهندسی آب، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان.

زارع ابیانه، ح.، بیات‌ورکشی، م.، سبزی‌پرور، ع.، معروفی، ص.، قاسمی، ع. (1389). ارزیابی روش‌‎های مختلف برآورد تبخیر- تعرق گیاه مرجع و پهنه‌بندی آن در ایران. پژوهش‌های جغرافیایی طبیعی، (74): 110-95.

 سلطانی، ا.، میر لطیفی، س. م.، دهقانی سانیج، ح. (1391). برآورد تبخیر- تعرق کرجع با استفاده از داده‌های محدود هواشناسی در شرایط اقلیمی مختلف. نشریه آب و خاک (علوم و صنایع کشاورزی)، 26 (1): 149-139.

موسوی بایگی، م.، اشرف، ب.، میان آبادی، آ. (1389). ارزیابی جهار مدل تبخیر- تعرق گیاه مرجع در یک اقلیم نیمه خشک ایران با هدف انتخاب بهترین مدل تابش. مجله پژوهش‌های حفاظت آب و خاک، 17 (4) :105-87.

Allen, R. G., Pruitt, W. O. (1991). FAO-24 Reference evapotranspiration factors. Journal of Irrig. Drain. Eng., 117,5 , pp: 758-773.

Allen, R.G., Pereira, L.S., Raes, D., Smith, M. (1998). Crop evapotranspiration – guidelines for computing crop water requirements, FAO Irrigation and Drainage Paper 56, FAO, pp:19- 5.

Alexandris, S., Kerkides,  P., Liakatas, A. (2006). Daily reference evapotranspiration estimates by the Copais  approach. Agric. Water Manage., 82, pp: 371–386.

Djaman, k., Balde, A.,Sow, A., Muller, B., Irmak, S., N’Diaye, M., Manneh, B., D.Moukoumbi, Y., Futakuchi, K ., Saito, K. (2015). Evaluation of sixteen reference evapotranspiration methods under sahelian conditions in the Senegal River Valey.Journal if Hydrology: Regional Studies 3, pp:139-159

Hargreaves, G.H. 1975. Moisture availability and crop production, Trans. Am. Soc. Agric.Eng., 18, 5, pp: 980-984.

Hargreaves, G. H.,  Samani,  Z. A. (1985). Reference crop evapotranspiration from  temperature. Appl. Eng. Agric., 1, 2, pp: 96–99.

Irmak, S., Irmak, A., Allen, R.G., Jones, J. W. (2003). Solar and net radiation-based equations to estimate reference evapotranspiration in humid climates. Journal of Irrig. Drain. Eng., ASCE ,129, 5, pp: 336–347.

Jones, J. W., Ritchie, J.T. (1990). Crop growth models. Management of farm irrigation system, G.J. Hoffman, T.A. Howel, and K.H. Solomon, eds., ASAE Monograph No.9, ASAE, St. Joseph, Mich. pp: 63-89.

Kisi, O. (2013). Comparison of  different empirical methods for estimating daily reference evapotranspiration in Mediterranean climate. Journal of Irrigation and Drainage Engineering, 140,1 pp: 1-24.

Pandey, P., P.Dabral, P., Pandey, V.(2016). Evaluation of reference evapotranspiration methods for the northeastern region of India. International Soil and Water Conservation Research 4. pp: 52-63.

Valipour, m. (2015). Investigation of Valiantzas’ evapotranspiration equation in Iran. Theoretical and Applied Climatology, 121, 1-2, pp:  267-278.

 Valiantzas, J. (2013). Simplified forms for the standardized FAO-56 Penman- Monteith refrence evapotranspiration using limited wether data. Journal of Hydro., 505, pp: 13-23.

Valiantzas, J. (2015). Simplified limited data Penman 15ET0">  formulas adapted for humid Locations. Journal of Hydro, pp: 701-707.