بررسی دقت روش‌های ترکیبی برآورد تبخیر و تعرق پتانسیل در اقلیم‌های خشک، نیمه‌خشک، نیمه مرطوب و مرطوب (مطالعه موردی ایران)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی، کرمانشاه، ایران.

2 استاد، گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی، کرمانشاه، ایران.

3 استادیار، گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی، کرمانشاه، ایران.

چکیده

چکیده
تخمین میزان دقیق تبخیر و تعرق در برنامه‌ریزی آبیاری و تعیین دور آبیاری از اهمیت فراوانی برخوردار است. از طرفی روش‌های متفاوتی برای برآورد تبخیر و تعرق پتانسیل گیاه مرجع وجود دارد. هدف از این مطالعه ارزیابی روش های ترکیبی به منظور معرفی روش برتر در تخمین تبخیر و تعرق پتانسیل گیاه مرجع در اقلیم‌های خشک، نیمه‌خشک، نیمه مرطوب و مرطوب ایران است. در این تحقیق بر اساس آمار اخذ شده از ایستگاه‌های سینوپتیک کشور در بازه زمانی سال‌های 1374 لغایت 1393 و با استفاده از روش‌های ترکیبی، میزان تبخیر و تعرق پتانسیل گیاه مرجع محاسبه و با روش پنمن مانتیس فائو 56 مقایسه شده است. نتایج نشانگر آن است که کلیه روش‌ها به غیر از روش بوزینگر وان باول، همبستگی خوبی با روش پنمن مانتیس فائو 56 دارند ) R^2>0.96 (. دقت روش بوزینگر وان باول در کلیه مناطق با مقادیرRMSE و MAE به ترتیب بزرگ‌تر از 9/0 و 55/0 میلی‌متر در روز می باشد. در مناطق خشک، مرطوب و نیمه مرطوب ایران روش‌های پنمن 1948 و پنمن کیمبرلی 1972 با مقادیرRMSE و MAE کمتر از 39/0 میلی‌متر در روز و در مناطق نیمه‌خشک ایران روش‌های پنمن کیمبرلی 1972 و پنمن 1948 با مقادیر RMSE و MAE کمتر از 35/0 میلی‌متر در روز به ترتیب بالاترین دقت را دارا می باشند.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of the accuracy of different combined methods for estimating the potential evapotranspiration in different climates (case study: Iran)

نویسندگان [English]

  • Saeid Nasseri 1
  • Houshang Ghamarnia 2
  • Rezvan Khosravi 1
  • Yazdan Mohamadi 1
  • Farhang Sargordi 3
1 Ph.D. Candidate, Department of Water Engineering, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
2 Professor, Department of Water Engineering, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
3 Assistant Professor, Department of Water Engineering, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran
چکیده [English]

Estimating the exact value of reference evapotranspiration is very important in irrigation planning and determining the irrigation frequency. There are different methods for estimating the reference crop evapotranspiration. The aim of this study was to find the best combined method for estimating the reference evapotranspiration in arid, semi-arid, semi-humid and humid climates of Iran. In this study, based on different necessary data from first order weather stations in the period of 1995 to 2014, the reference evapotranspiration was calculated by some combined methods and compared with FAO 56 Penman Monteith method. The results showed that all methods except Businger and Van bavel method have a good correlation with FAO 56 Penman Monteith (R^2 > 0.96). The accuracy of Businger and Van bavel methods in all regions were low with RMSE and MAE values greater than 0.9 and 0.55 mm per day, respectively. In arid, humid and semi-humid regions of Iran, Penman 1948 and Penman Wright 1972 methods with RMSE and MAE values less than 0.39 mm per day and in semi- arid regions of Iran Penman Wright 1972 methods and Penman 1948 with RMSE and MAE values less than 0.35 mm per day had the highest accuracy.

کلیدواژه‌ها [English]

  • Buzinger van Bavel
  • De Martonne climate classification
  • FAO Penman Monteith
  • Penman Wright
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