ارزیابی تبخیر و تعرق با استفاده از تصاویر ماهواره‏ای و الگوریتم سبال ‌(مطالعۀ موردی: شرق استان آذربایجان شرقی)

نوع مقاله : پژوهشی

نویسندگان

1 دانش‌آموختۀ دکتری آب‏ وهواشناسی کشاورزی، دانشگاه حکیم سبزواری

2 استادیار هیدرواقلیم، دانشگاه حکیم سبزواری

چکیده

ارزیابی میزان تبخیر و تعرق یکی از راه‏های جلوگیری از هدررفت آب و مدیریت منابع آب است. بنابراین، در پژوهش حاضر سعی شده است با استفاده از الگوریتم سبال، میزان تبخیر و تعرق واقعی در شرق استان آذربایجان شرقی محاسبه شود. برای این منظور، ابتدا بر اساس دو تصویر ماهواره‏ای لندست 8 به تاریخ‏های 22/08/2017 و 09/08/2018 مقادیر شار تابش، شار گرمای خاک، شار گرمای محسوس برآورد شد. سپس، بر اساس تفاضل به‌دست‌آمده، مقادیر شار گرمای لحظه‏ای محاسبه شد و تبخیر و تعرق 24 ساعته برای هر تصویر به دست آمد. در نهایت، میزان به‌دست‌آمده با مقادیر به‌دست‌آمده از روش پنمن – مانتیث مقایسه شد. همچنین، برای پردازش و تجزیه‌وتحلیل تصاویر از نرم‏افزار ENVI4.8 استفاده شد. نتایج بیانگر آن بود که میزان تبخیر و تعرق در روش پنمن‌ـ مانتیث و سبال در تاریخ 22/08/2017 به‌ترتیب حدود 35/6 و 7 میلی‏متر در روز و در تاریخ 09/08/2018 به‌ترتیب حدود 25/7 برای پنمن‌ـ مانتیث و 94/7 میلی‏متر در روز برای سبال بوده است. در مجموع، مقادیر تبخیر و تعرق واقعی سبال و تبخیر و تعرق پتانسیل پنمن‌ـ مانتیث دارای میانگین تفاضل مطلق (MAD) 67/0 میلی‏متر در روز است که بیان می‌کند بین مقادیر تخمین‌زده‌شده به‏وسیلۀ الگوریتم سبال و روش پنمن‌ـ مانتیث تطابق خوبی وجود دارد.

کلیدواژه‌ها


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دوره 8، شماره 1
فروردین 1400
صفحه 17-27
  • تاریخ دریافت: 22 مرداد 1399
  • تاریخ بازنگری: 30 آذر 1399
  • تاریخ پذیرش: 30 آذر 1399
  • تاریخ اولین انتشار: 18 اسفند 1399
  • تاریخ انتشار: 01 فروردین 1400