نشریه علمی پژوهشی مهندسی آبیاری و آب ایران

نشریه علمی پژوهشی مهندسی آبیاری و آب ایران

ارزیابی شاخص‌های خشکی با استفاده از داده‌های ماهواره‌ای موجود در سامانه گوگل ارث انجین

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار گروه مهندسی آب مجتمع آموزش عالی کشاورزی و دامپروری تربت‌جام
2 مجتمع آموزش عالی تربت جام، خراسان رضوی، ایران.
3 مجتمع آموزش عالی تربت جام، خراسان رضوی، ایران
4 استادیار گروه علوم و مهندسی آب ، مجتمع آموزش عالی تربت‌جام، تربت‌جام
10.22125/iwe.2024.429308.1776
چکیده
خشکی یک ویژگی اقلیمی است که بر بسیاری از جنبه‌های زندگی، عمدتاً در کشاورزی، بلکه در سایر بخش‌های اقتصادی تأثیر بسزایی دارد. در این مطالعه از پلتفرم گوگل ارث انجین(Google Earth Engine (GEE)) برای پایش و ارزیابی دو شاخص خشکی دومارتن و فائو در ده ایستگاه در استان خراسان رضوی در مقیاس سالانه و در دوره آماری 2021-2000 استفاده شده است. در این پلتفرم از داده‌های تبخیر و تعرق پنمن مانتیث موجود در مجموعه داده‌های اقلیمی ماهانه دانشگاه آیداهو (TerraClimate) برای مقادیر تبخیر و تعرق پتانسیل ماهانه استفاده گردید. برای محاسبه دما از مجموعه داده‌های MODIS (MOD11A1 V6.1) استفاده شد. مجموعه داده محصول (CHIRPS) برای محاسبه میزان بارش ماهانه استفاده شد. به منظور ارزیابی شاخص‌های خشکی از شاخص‌های آماری ضریب همبستگی (CC)، بایاس نسبی (RBIAS)، ریشه میانگین مربعات خطا (RMSE)، شاخص نش-ساتکلیف (NSE) و مقدار احتمال تخمین (POD) استفاده شد. نتایج آنالیز‌های آماری نشان داد که شاخص خشکی دومارتن در ایستگاه‌های مشهد، تربت جام، نیشابور، گناباد و گلمکان با ضریب همبستگی در محدوده 851/0-704/0، ریشه میانگین مربعات خطا در محدوده 419/2-228/1، بایاس نسبی (منفی) در محدوده 227/0-096/0، شاخص نش-ساتکلیف در محدوده 633/0- 142/0و احتمال تخمین در محدوده 1-773/0 به عنوان بهترین روش برای محاسبه شاخص خشکی در مقیاس سالانه انتخاب گردید. در سایر ایستگاه‌های مورد مطالعه روش فائو به عنوان بهترین روش محاسبه شاخص خشکی درنظر گرفته‌شد. به طور کلی استفاده از داده‌های ماهواره‌ای پلت فرم گوگل ارث انجین در تحقیق حاضر با توجه به تفکیک مکانی - زمانی مناسب، نتایج قابل اعتماد و رضایت بخشی به دست می‌دهد
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Drought Index Assessment with Satellite Data Available in Google Earth Engine

نویسندگان English

zahra Shirmohammadi_Aliakbarkhani 1
Seyed Farhad Saberali 2
Hossein Nastari Nasrabadi 3
Sayyed Mohammad Javad Mirzaei 4
1 Faculty of Agriculture and Animal Science, university of Torbat-e Jam
2 High Educational Complex of Torbat-e Jam
3 High Educational Complex of Torbat-e Jam, khorasan Razavi, Iran
4 Department of Water Science and Eengineering, High Educational Complex of Torbat-e Jam, Khorasan Razavi, Iran
چکیده English

Aridity is a climatic characteristic that has a significant impact on many aspects of life, mainly in agriculture but also in other economic sectors. In this study, a Google Earth Engine (GEE) platform was implemented to monitor and Evaluation of two aridity indexes, such as the De Martonne aridity index, and FAO aridity index at ten stations in Razavi Khorasan province from 2000 to 2021. The University of Idaho's monthly climate data set (TerraClimate) is used to calculate monthly potential evaporation and transpiration. MODIS dataset (MOD11A1 V6.1) used to calculate temperature. The product dataset (CHIRPS) is used for calculating the monthly rainfall. Satellite data, in comparison to the aridity index calculated with ground data, is evaluated using widely accepted statistical indices such as the correlation coefficient (CC), relative bias (RBIAS), root mean squared error (RMSE), Nash–Sutcliffe model efficiency coefficient (NSE), and probability of detection (POD). The results showed that the De Martonne aridity index in Mashhad, Torbat Jam, Neishabour, Gonabad, and Golmakan stations, with a correlation coefficient in the range of 0.704-0.851, root mean square error in the range of 1.228-2.419, relative bias (negative) in the range of 0.096-0.227, Nash-Sutcliffe index in the range of 0.142-0.633, and the probability of estimation in the range of 0.773-1, was chosen as the best method of calculating the yearly aridity index. In other studied stations, the FAO method is the best. Overall, the current study's use of satellite data is appropriate and yields dependable and satisfying results because of its suitable spatiotemporal separation.

کلیدواژه‌ها English

Aridity
Google Earth Engine
MODIS
Remote Sensing
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