اعتبارسنجی و تصحیح محصول تبخیر-تعرق واقعی برآورد شده از محصول WaPOR فائو در ایران با استفاده از داده‌های زمینی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناس پژوهشی موسسه تحقیقات آب وزارت نیرو

2 موسسه تحقیقات منابع آب وزارت نیرو ، تهران

3 موسسه تحقیقات آب وزارت نیرو، تهران، ایران

چکیده

برآورد تبخیر-تعرق واقعی (ETa) در مقیاس حوضه و مزرعه، یکی از اطلاعات ضروری جهت برنامه‌ریزی تخصیص منابع آب می‌باشد. اگرچه برآورد ETa با محدودیت‌های مکانی، زمانی و هزینه‌ای روبرو است، اما با استفاده از تصاویر ماهواره‌ای می‌توان تا حدی بر محدودیت‌های موجود فائق گردید. در این راستا، هدف از در تحقیق حاضر نیز الف) ابتدا ارزیابی و اعتبارسنجی یکی از جدیدترین محصولات تبخیر- تعرق واقعی، محصول WaPOR با مقادیر اندازه‌گیری شده توسط دستگاه Scintillometer و سپس ب) برآورد و تحلیل تغییرات مقدار ETa در کاربری‌های مختلف حوضه آبریز زاینده‌رود می‌باشد. بر اساس نتایج، مقدار آماره‌های MAE، RMSE، MAPE و R به -ترتیب برابر با 14/2 (میلی‌متر در مدت 10 روز)، 55/2 (میلی-متر در مدت 10 روز)، 50/5 و 97/0 می‌باشد که نتایج حاکی از صحت و دقت مناسب تبخیر-تعرق واقعی، محصول WaPOR فائو در مقایسه با داده‌های دستگاه Scintillometer، است. همچنین نتایج بررسی مقدار این متغیر در کاربری‌های مختلف نشان داد که بیشترین میزان ETa در سال 2016 به ترتیب مربوط به کشت‌های دوگانه، اراضی باغی، کشت‌های بهاره، کشت‌های پاییزه، دیم و مراتع می‌باشد که به ترتیب دارای مقادیری در حدود 513، 387،272، 271، 112 و 83 میلی‌متر هستند. همچنین ارزیابی مصرف آب در شالیزارها نیز نشان داد، 992 میلی‌متر آب به‌صورت ETa از دسترس خارج می-گردد که با توجه به شرایط منابع آبی حاکم در این حوضه آبریز، مقدار بالای است و نیاز به برنامه‌ریزی دقیق‌تری جهت حذف یا کاهش سطح زیر کشت این محصول می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Validation and calibration of FAO WaPOR product (actual evapotranspiration) in Iran using in-situ measurements

نویسندگان [English]

  • morteza rahimpour 1
  • Nematolla Karimi 2
  • Reza Rouzbahani 3
  • morteza Eftekhari 3
1 Water Resource Department, Water Research Institute of Ministry of Energy
2 Water Research Institute of Ministry of Energy, Iran
3 Water Research Institute of Ministry of Energy, Tehran, Iran
چکیده [English]

Estimation of actual evapotranspiration (ETa) in the scales of basin and field is one of the essential information for water resources allocation. Although estimating actual evapotranspiration has encounter with several restrictions (e.g., spatially, temporally and costly), but satellite images data can overcome these limitations usually. In this regard, the objectives of present paper are: a) evaluation and validation of WaPOR ETa product using Scintillometer instrument and, b) estimation of ETa over several land use regions over the Zayanderoud basin. Based on obtained results, MAE, RMSE, MAPE and R are equal to 2.14 (mm for 10 days), 2.55 (mm for 10 days), and 5.50 and 0.97 respectively which represent the appropriateness of WaPOR ETa data in comparison with Scintillometer. Also, the analysis of WaPOR product in different land-used showed that, the maximum amount of actual ETa has occurred in dual crops (513 mm), orchards (387 mm), spring crops (272 mm), autumnal crops (271 mm), dry farming (112 mm) and rangelands (83 mm) respectively. Also the results show that in rice fields, 992 mm fresh water lost in the form of ETa which is considered dramatically due to the climate and water resources of selected basin and its relevance challenges.

کلیدواژه‌ها [English]

  • Actual Evapotranspiration
  • WaPOR Product FAO
  • Scintillometer
  • Zayandehrood Basin

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