برآورد تبخیرتعرق واقعی در مقیاس محلی با استفاده از مدل SSEBop

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی و مدیریت منابع آب، دانشکده مهندسی عمران و محیطزیست، دانشگاه تربیت مدرس، تهران، ایران.

2 استادیار گروه مهندسی آب، دانشکده مهندسی عمران و محیطزیست، دانشگاه تربیت مدرس، تهران، ایران

3 استادیار پژوهشکده مطالعات و تحقیقات منابع آب، مؤسسه تحقیقات آب، تهران، ایران.

چکیده

برآورد دقیق تبخیرتعرق واقعی روزانه (ETa) و تحلیل تغییرات زمانی و مکانی آن به ویژه در مقیاس محلی برای مدیریت مصارف آب ضروری است. مدل عملیاتی بیلان انرژی سطح ساده شده (SSEBop) یکی از ساده‌ترین مدل‎های تک منبعی بیلان انرژی سطحی بر مبنای داده‌های سنجش از دور است که کارایی مناسب آن در برآورد تبخیرتعرق واقعی نشان داده شده است. با این وجود، مطالعات محدودی در خصوص عملکرد این مدل در ایران انجام شده است. در این مطالعه، عملکرد مدل SSEBop برای تخمین تبخیرتعرق واقعی روزانه محصول یونجه در مزرعه کشت و صنعت بهاران واقع در شرق اصفهان بررسی شد. پس از کالیبراسیون پارامترهای مدل، بروزرسانی کد و اعتبارسنجی خروجی‌های میانی مدل، نتایج تبخیرتعرق واقعی بدست آمده از مدل SSEBop با ETa برآورد شده با داده‌های دستگاه سنتیلومتر و یک ایستگاه هواشناسی خودکار مجاور آن در مزرعه مقایسه شد. نتایج بدست آمده، عملکرد قابل قبول مدل SSEBop را برای برآورد ETa از سطح مناطق پوشش گیاهی همگن تأیید می‌کند (RMSE= 0.8 mm.day-1، r= 0.81). اما در حین و بعد از برداشت محصول که توده گیاهی کاهش می‌یابد  (NDVI<0.4) مدل عملکرد مناسبی ندارد. باتوجه به اینکه مدل SSEBop نیاز به حداقل داده‌های زمینی دارد و اجرای خودکار آن آسان است، می‌تواند برای استفاده‌های عملیاتی در مدیریت آبیاری و مصارف آب در کشور توصیه شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Estimation of Actual Evapotranspiration at Local Scale Using the SSEBop Model

نویسندگان [English]

  • Iman Raissi-Dehkordi 1
  • Somayeh Sima 2
  • Neamat Karimi 3
1 M.Sc. Student of Water Resources Engineering and Management, Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran.
2 Assistant Professor of Water Engineering, Faculty of Civil & Environmental Engineering, Tarbiat Modares University, Tehran, Iran.
3 Assistant Professor, Water Resources Studies and Research Institute, Water Research Institute, Tehran, Iran.
چکیده [English]

Accurate estimation of the actual evapotranspiration (ETa) and analysis of its spatiotemporal variations is crucial for irrigation water management, particularly at local and daily scales. The Operational Simplified Surface Energy Balance (SSEBop) model is among the most efficient and practical single-source surface energy balance models based on remote sensing data. Nevertheless, limited studies are made to assess the performance of this model in Iran. In this study, a modified version of SSEBop (based on the use of local weather data, automatic calculation of daily reference evapotranspiration, and variable surface albedo) was introduced and its performance was examined over a 14-ha alfalfa farmland in East Isfahan. To this end, the model was calibrated and both the intermediate model outputs (e.g., surface temperature and albedo) and the estimated actual daily evapotranspirations were validated against the in-situ ETas obtained from a scintillometer and an adjacent automatic weather station. The results showed an acceptable performance (RMSE= 0.8 mm.day-1, r= 0.81) of the modified and locally calibrated SSEBop model for estimating daily ETa throughout the growth season. However, during and after harvesting, when the crop biomass was low (NDVI<0.4), the model failed. This study reveals the promising application of the SSEBop for operational irrigation management practices

کلیدواژه‌ها [English]

  • Potential Evapotranspiration
  • Energy Balance
  • Scintillometer
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