تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

تحلیل تغییرات جزیره حرارتی سطوح شهری در روز و شب با استفاده از محصولات چند زمانه سنجنده مادیس (مطالعه موردی: کلانشهر تهران)

نویسندگان
سیروس هاشمی دره بادامی 1
علی درویشی بلورانی 1
سید کاظم علوی پناه 1
محمد ملکی 2
رضا بیات 1
1 دانشگاه تهران
2 دانشگاه خوارزمی
10.29252/jgs.19.52.113
چکیده
اصطلاح جزیره حرارتی شهری (UHI)، پدیده تغییر دمای مناطق شهری در مقایسه با مناطق پیرامون آن را توصیف می کند. اثرات UHI شامل: افزایش مصرف انرژی و آب، افزایش آلودگی هوا و تداخل در آسایش حرارتی می باشد. جزیره حرارتی سطوح شهری (SUHI) در برگیرنده الگوهای دمای سطح زمین (LST) درمناطق شهری است که با UHI در لایه تاج پوشش شهری و لایه مرز شهری (UBL) در ارتباط است و با سنجش از دور حرارتی قابل بررسی است . با توجه به اینکه SUHI دارای نوسانات روزانه و فصلی می باشد لذا نیاز به داده‌های چند زمانه در تحلیل SUHI، دور از انتظار نیست. در این تحقیق از داده‌های چند زمانه MODIS (آکوا و ترا)، به منظور تحلیل SUHI در شب و روز در کلانشهر تهران استفاده شد. خواص فیزیکی و بیوفیزیکی سطح زمین از قبیل کاربری اراضی، ارتفاع، آلبدو، شاخص پوشش گیاهی NDVI و شاخص سطوح نفوذناپذیر NDBI به منظور تفسیر تغییرات LST و SUHI استفاده شد. نتایج نشان داد که SUHI در تهران، دارای نوسانات مکانی و زمانی روزانه و فصلی است به طوریکه در ایام گرم سال در طول روز جزیره سرمایی سطوح شهری (SUCL) در سطح شهر تهران تشکیل می شود. در شب مقدار شاخص SUHI بین 2 تا 5 درجه سانتی‌گراد (حداکثر در بهار) متفاوت است. همچنین نتایج نشان داد که ویژگی‌های حرارتی متفاوت پوشش های زمین، آلبدو و ارتفاع مهمترین عوامل تغییرات روزانه SUHI تهران است در حالی که تغییرات فنولوژیکی پوشش گیاهی و آلبدو، مهمترین عوامل تغییرات فصلی SUHI تهران می باشد.



[1]. Surface urban Cool Island
کلیدواژه‌ها
جزیره حرارتی سطوح شهری
جزیره سرمایی شهری
محصولات مادیس
خواص بیوفیزیکی سطوح شهری

عنوان مقاله English

Investigation of changes in surface urban heat-island (SUHI) in day and night using multi-temporal MODIS sensor data products (Case Study: Tehran metropolitan)

نویسندگان English

Sirous Hashemi Darebadami 1
Ali Darvishi Boloorani 1
Seyed Kazem AlaviPanah 1
Mohammad maleki 2
Reza Bayat 1
1 university of tehran
2 Kharazmi University
چکیده English

The term urban heat island (UHI), described the phenomenon of climate change in urban areas compared with surrounding rural areas. UHI effects include: increasing in energy and water consumption, air pollution expansion and interfering in thermal comfort. Surface urban heat island (SUHI) contains patterns of land surface temperature (LST) in urban areas that has interaction with UHI in urban canopy layer and urban boundary layer and investigate with thermal remote sensing. SUHI has diurnal and seasonal variations so requires multi-temporal data to analysis SUHI. In this study, the multi-temporal MODIS (Aqua and Terra) data product were used to analyze the SUHI in day and night in Tehran metropolitan. Physical and biophysical surface properties such as: land cover/land use (LULC), elevation, albedo, vegetation index (NDVI) and impervious surfaces index (NDBI) were used to interpretation of the LST and SUHI changes. The results showed that SUHI in Tehran, has spatial-temporal diurnal and seasonal variation. So that during warm days the surface urban cool island (SUCL) is formed in Tehran. At night times, SUHI index values was different between 2 and 5 ° C (maximum in the spring). The results also showed that different of land cover thermal properties, albedo and elevation was the most important factors is the diurnal changes of SUHI while phonological changes of vegetation and albedo, was the most important factors in seasonal changes of SUHI.

کلیدواژه‌ها English

Surface Urban Heat Island
Surface Urban Cool Island
MODIS products
Physical and biophysical surface properties
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