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ارزیابی دقت برآورد مکانی تبخیر-تعرق با الگوریتم SEBS در منطقهی کوهستانی خشک، جنوب ایران | ||
| پژوهش های آبخیزداری | ||
| مقاله 8، دوره 31، شماره 3 - شماره پیاپی 120، مهر 1397، صفحه 91-107 اصل مقاله (1.1 M) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/wmej.2018.122097.1122 | ||
| نویسندگان | ||
| مریم زارع1؛ ام البنین بذرافشان* 2؛ مجتبی پاک پرور3؛ غلامرضا قهاری3 | ||
| 1دانشجوی دکتری تخصصی علوم و مهندسی آبخیزداری، دانشگاه هرمزگان، دانشکده کشاورزی، بندرعباس، ایران | ||
| 2استادیار دانشگاه هرمزگان، دانشکدهی کشاورزی و منابعطبیعی، بندرعباس، ایران | ||
| 3استادیار بخش تحقیقات حفاظت خاک و آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی سازمان تحقیقات آموزش و ترویج کشاورزی، شیراز، ایران | ||
| چکیده | ||
| مقدار واقعی ﺗﺒﺨﻴﺮ-ﺗﻌﺮق از سطح حوضهی آبخیز، یکی از عوامل اصلی در دورهی آبشناسی و از اجزای مهم معادلهی تراز آب است که بخش عمدهای از جریانهای خروجی حوضه یا هر مقیاس دیگری است. اندازهگیری مقدار واقعی ﺗﺒﺨﻴﺮ-ﺗﻌﺮق از دشواریهای بررسیهای تراز آب است، چراکه ﺑﻪﻋﻠﺖ نقطهای ﺑﻮدن اﻃﻼﻋﺎت ﻫﻮاﺷﻨﺎﺳﻲ و دشواری تعیین ضریب گیاهی، دﻗﺖ اﺳﺘﻔﺎده از شبیههای ﻣﺮﺳﻮم در ﺑـﺮآورد پهنهای ﺗﺒﺨﻴـﺮ-ﺗﻌﺮق واﻗﻌﻲ کم است. در این پژوهش با استفاده از نُه تصویر ماهوارهی لندست 8، دادههای هواشناسی ایستگاه کِلِستان و شبیه SEBS تبخیر-تعرق دورهی زمانی 1393 تا 1396 در منطقهی کلستان در شمالغربی شیراز محاسبه، و نتایج آن با معادلهی ﻓﺎﺋﻮ ﭘﻨﻤﻦ-ﻣﺎﻧﺘﯿس مقایسه شد تا درستی این شبیه در این منطقه بررسی شود. پروندههای تشعشع مورد نیاز SEBS با استفاده از شناسهی دستوری R.sun در نرمافزار گراس-جیآیاس تولید، و دیگر دادههای سنجشازدور در محیط الویس محاسبه شدند. نتایج تبخیر-تعرق بهدستآمده از شبیه SEBS در مقایسه با معادلهی یادشده ازلحاظ آماری ضریب همبستگی ۹۹۳/۰ را نشان داد. تغییرات مقادیر تبخیر-تعرق واقعی در کاربریهای مختلف در محدودهای پذیرفتنی بود. تولید اطلاعات پهنهای مطمئن از تبخیر-تعرق از مزیتهای برجستهی کاربرد این شبیه در بررسیهای آبشناسی حوضه است. | ||
| کلیدواژهها | ||
| الگوریتم SEBS؛ تبخیر-تعرق واقعی؛ تصاویر لندست 8؛ روندیابی مکانی | ||
| عنوان مقاله [English] | ||
| Evaluation of Spatial Evapotranspiration Estimation by the SEBS Model in a Dry Mountainous Region, Southern Iran | ||
| نویسندگان [English] | ||
| Maryam Zare1؛ Ommolbanin Bazrafshan2؛ Mojtaba Pakparvar3؛ Gholamreza Ghahari3 | ||
| 1Ph.D. Student of Watershed Management, University of Hormozgan | ||
| 2Assistant Professor Agriculture engineering and natural resource, University of Hormozgan | ||
| 3Assistant Professor of Soil Conservation and Watershed Management Research Department, Fars Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Shiraz, Iran | ||
| چکیده [English] | ||
| The conventional methods for actual evapotranspiration (ETa) estimating is not sufficiently accurate due to the point based nature of meteorological data and the difficulties related to the plant coefficient (Kc) estimation. The true rate of ET from a basin is an important factor of hydrological cycle and in the water balance equation and accounts for a huge part of out-flow of a basin or any other scale. In this study, the ET values were calculated in the region of Kelestan located in the northwest of Shiraz. The SEBS evapotranspiration model was applied and evaluated by using the Landsat 8 satellite images (nine images) and the meteorological data collected at the Kelestan Station for the period 2015–2017. Results were compared to the FAO Penman-Monteith equation to verify the accuracy of this model in the region of Kelestan. The radiation sources required for the SEBS model were produced by the R.sun module in Grass-GIS. Other remote sensing data were calculated in the Ilwis software environment. The results of evapotranspiration obtained from the SEBS model in comparison with the mentioned equation showed a correlation coefficient of 0.999, which is statistically significant. Variations of the ETa for different landuses were within a reasonable range. The production of reliable data from evapotranspiration is one of the prominent advantages of using this model for application in hydrologic research of the basin. | ||
| کلیدواژهها [English] | ||
| Eta, Landsat 8, SEBS model, spatial evapotranspiration | ||
| مراجع | ||
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