نوع مقاله : مطالعه موردی

نویسندگان

1 استادیار، بخش تحقیقات حفاظت خاک و آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان زنجان، سازمان تحقیقات، آموزش و ترویج کشاورزی، زنجان، ایران

2 استادیار، بخش تحقیقات حفاظت خاک و آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان فارس، سازمان تحقیقات، آموزش و ترویج کشاورزی، فارس، ایران

3 دانشیار، پژوهشکده حفاظت خاک و آبخیزداری، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

چکیده

تبخیر و تعرق یکی از مهمترین عناصر چرخه هیدرولوژیکی است. برآورد تبخیر و تعرق برای مدیریت مؤثرجنگل، آبیاری، مرتع و منابع آب و همچنین افزایش عملکرد و مدیریت بهتر محصول ضروری است. هدف از این پژوهش واسنجی الگوریتم SEBAL در تخمین تبخیر و تعرق در دشت سهرین-قره­چریان که متأثر از پخش سیلاب است، می­باشد. در این مطالعه تصاویر ماهواره ای لندست 8 در دوره یکساله 1399-1400 برای به­دست آوردن ضرایب باندهای مربوطه استفاده شد. سپس شار خالص تشعشع سطح زمین و شار حرارتی زمین با استفاده از شارهای تشعشعی ورودی-خروجی از آلبیدو، ضرایب انتشار سطحی، دمای سطح زمین و شاخص‌های گیاهی برآورد شد. در مرحله بعد شار حرارتی محسوس با تعیین پیکسل­های سرد و گرم محاسبه و در نهایت نقشه­های تبخیر و تعرق استخراج شد. بر اساس نتایج این پژوهش تبخیر و تعرق حاصل از مدل بیلان آب خاک و مدل سبال به ترتیب معادل 24115 و m3 19642 در سال برآورد شد. همچنین واسنجی نتایج حاصل از مدل سبال با تبخیر و تعرق مرجع با استفاده از ﺷﺎﺧﺺ­های آماری R2 و RMSE انجام شد که مقادیر این شاخص­ها به ترتیب معادل 64/0و 15/2 محاسبه شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Calibration of SEBAL Surface Energy Balance Algorithm in Determining Evapotranspiration of Plains Affected by Flood Spreading (Qaracherian-Zanjan Province)

نویسندگان [English]

  • Ghobad Rostamizad 1
  • Parviz Abdinejhad 1
  • Mojtaba Pakparvar 2
  • mir masoud kherkhah zarkesh 3

1 Assist. Professor, Soil Conservation and Watershed Management Department, Zanjan Agricultural and Natural Resources Research Center, AREEO, Zanjan, Iran

2 Assist. Professor, Soil Conservation and Watershed Management Department, Fars Agricultural and Natural Resources Research Center, AREEO, Fars, Iran

3 Assoc. Professor, Soil Conservation and Watershed Management Research Institute, Agricultural and Natural Resources Research Center, AREEO, Tehran, Iran

چکیده [English]

Evapotranspiration is one of the most important elements of the hydrological cycle. Estimation of evapotranspiration is imperative for effective forest, irrigation, rangeland and water resources management as well as to increase yields and for better crop management. The aim of this study is to calibrate the SEBAL algorithm in estimating evapotranspiration in the Sohrin-Qaracheryan plain, which is affected by flood spreading. In this study, Landsat 8 satellite images were used in 2020-2021 to obtain the coefficients of the relevant bands. Then, the net radiation flux on the earth’s surface and the earth’s heat flux is obtained using incoming-outgoing radiation fluxes from albedo, surface emissivity, land surface temperature, and plant indicators. Next, the sensible heat flux is calculated by determining the hot and cold pixels. Finally, evapotranspiration maps are plotted. Based on the results of this research evapotranspiration obtained from soil water balance model and SEBAL algorithm were estimated as 24115 and 19642 m3, respectively. Also, the calibration of the results obtained from the SEBAL algorithm with reference evapotranspiration was done using R2 and RMSE statistical indices, and were calculated the values of these two indices as 0.64 and 2.15, respectively.  

کلیدواژه‌ها [English]

  • Albedo
  • Evapotranspiration
  • Satellite Images
  • Sohrin Plain
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