تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

پایش و واکاوی تغییرات خشکسالی با استفاده از داده‌های دورسنجی در استان کرمانشاه

نویسندگان
1 دانشیار آب و هواشناسی، گروه جغرافیا، دانشکده علوم جغرافیایی، دانشگاه خوارزمی، تهران، ایران
2 استادیار آب و هواشناسی، گروه جغرافیا، دانشکده علوم جغرافیایی، دانشگاه خوارزمی، تهران، ایران
3 کارشناسی ارشد آب و هواشناسی، دانشکده علوم جغرافیایی، دانشگاه خوارزمی، تهران، ایران
چکیده
خشکسالی یکی از بلایای طبیعی است که اثرات آن در درازمدت بر اقتصاد و جامعه تأثیرگذار است این پدیده در مناطق خشک و نیمه‌خشک ازجمله ایران چالش محسوب می‌شود. امروزه بهره‌گیری از روش‌های سنجش‌ از دور می‌تواند ما را در شناخت رفتار خشکسالی پوشش گیاهی کمک نماید. به ‌منظور پایش و واکاوی رفتار خشکسالی در استان کرمانشاه از داده‌های محصولات سنجنده ویرز (VIIRS) و نیز داده‌های AVHRR که نوا استار (NOAA STAR) نمایه می‌شود بهره گرفته شد. در این مطالعه از نمایه سلامت پوشش گیاهی (Vegetation Health Index) در دوره زمانی 1982-2021 به‌صورت هفت‌روزه و با تفکیک مکانی 4 × 4 کیلومتری استفاده شد. پس از استخراج داده‌ها در گستره کرمانشاه، روند خشکسالی پوشش گیاهی بر روی 65387 یاخته به کمک آزمون من کندال مورد بررسی قرار گرفت. نتایج نشان داد که در فصل زمستان روند پوشش گیاهی در نواحی غربی استان در سطح 05/0 کاهشی و معنادار بوده؛ در حالی که در نواحی شمالی، مرکزی و شرقی استان روند افزایشی و معنادار است. در فصل‌های بهار و تابستان مخصوصاً ماه‌های خرداد، تیر، مرداد و شهریور که منطبق بر ماه‌های خشکِ ‌سال است بر وسعت مناطق دارای روند کاهشی و معنادار پوشش گیاهی افزوده‌شده است درحالی‌که در فصل پاییز با آغاز سال آبی، از وسعت مناطق دارای روند کاهشی کاسته شده است.
کلیدواژه‌ها

عنوان مقاله English

Monitoring and analysis of drought behavior using remote sensing data in Kermanshah province

نویسندگان English

Mohammad Hossein Nasserzadeh 1
Ali Reza Karbalaee doree 2
Mohammad Siah Kamari 3
1 Associate Professor of Climatology, Department of Geography, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran
2 Assistant Professor Department of Climatology Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran
3 Master's degree in Climatology, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran.
چکیده English

Drought is one of the natural disasters whose long-term effects affect the economy and society. This phenomenon is considered a challenge in arid and semi-arid regions, including Iran. Nowadays, the use of remote sensing methods can help us in understanding the drought behavior of vegetation. In order to monitor and analyze the behavior of drought in Kermanshah province, the data of Sanjande Weathers products (VIIRS) and AVHRR data indexed by NOAA STAR were used. In this study, the Vegetation Health Index was used in the period of 1982-2021 in a seven-day format with a spatial resolution of 4 x 4 km. After extracting the data in the Kermanshah area, the vegetation drought trend was investigated on 65,387 cells using the Mann-Kendall test. The results showed that in the winter season, the trend of vegetation cover in the western areas of the province was decreasing and significant at the level of 0.05. While in the northern, central and eastern regions of the province, the trend is increasing and significant. In the spring and summer seasons, especially the months of June, July, August and September, which correspond to the dry months of the year, the size of the areas with a significant decreasing trend of vegetation cover has increased, while in the autumn season, with the beginning of the water year, the size of the areas with a decreasing trend has decreased.

کلیدواژه‌ها English

VHI change
vegetation health profile
drought
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