نشریه محیط زیست طبیعی

بررسی تغییرات دمای سطح زمین (LST) درمنطقه‌بندی آب‌و‌هوای محلی (LCZs) مناطق نیمه‌خشک (مطالعة شهر بجنورد)

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه علوم و مهندسی محیط‌ زیست، دانشکدة شیلات و محیط‌ زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران.

10.22059/jne.2024.372929.2653

چکیده

شهرنشینی که به‌عنوان عامل اصلی مشکلات اقلیمی در شهرها در نظر گرفته می‌شود، نه‌تنها محیط فیزیکی شهرها را تغییر داده است، بلکه ویژگی‌های آب‌وهوای محلی و منحصر به‌فرد مناطق شهری را تحت تأثیر قرار داده است. هدف از این مطالعه بررسی رابطة بین ویژگی‌های سطحی مناطق آب‌وهوای محلی استخراج‌شده از تصاویر ماهواره‌ای و دمای سطح زمین در یک منطقة نیمه‌خشک است. با استفاده از یک رویکرد طبقه‌بندیLCZ ، این مطالعه به‌دنبال درک چگونگی تأثیر LCZ بر LST در این زمینة محیطی خاص است. این مطالعه شامل چهار مرحلة اصلی بود: پیش‌پردازش تصاویر، بازیابی LST، تهیة نقشة LCZ و تجزیه تحلیل فضایی. طرح LCZ برای منطقه‌بندی منطقة مورد مطالعه بر اساس دو مجموعه انواع انسان‌ساخت و انواع پوشش زمین استفاده شد. Google Earth برای مشخص کردن مناطق آموزشی و تعریف انواع مختلف LCZ مورد استفاده قرار گرفت. از داده‌های سنجندة مادون‌قرمز حرارتی لندست و الگوریتم پنجرة مجزا (SWA) برای بازیابی LST استفاده گردید. نتایج نشان داد مجموعه­ های انسان‌ساخت و پوشش طبیعی زمین به‌عنوان دو مجموعه الگوی مستقل در منطقة مورد مطالعه رفتار می‌کنند. LST مجموعه‌ انسان‌ساخت نسبت به انواع پوشش گیاهی زمین (جنگل، مزارع و بوته‌ها) در محدودة گرم‌تری نوسان داشت. این مطالعه با روشن کردن رابطة بین خواص سطحی طبقات LCZ و LST، بینش ­های ارزشمندی را در مورد عوامل مؤثر بر پویایی حرارتی در محیط‌های نیمه‌خشک ارائه می‌دهد. با استفاده از این دانش، برنامه‌ریزان شهری می ­توانند استراتژی­ ها و مداخلات آگاهانه­ تری را با هدف کاهش چالش های مربوط به گرما و بهبود زندگی شهری توسعه دهند.    

کلیدواژه‌ها

عنوان مقاله [English]

Land surface temperature (LST) variability in local climate zones (LCZs) in semi-arid regions (Case study: Bojnourd City)

نویسندگان [English]

  • Zzahra Parvar
  • Marjan Mohammadzadeh
  • Sepideh Saeidi

Department of Environmental Sciences, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Iran.

چکیده [English]

Urbanization which has been considered the main contributor to climatic problems in cities, not only changed the physical environment in cities, but also has affect the characteristics of local climate zone. This study aims to investigate the relationship between surface properties of Local Climate Zones (LCZ) extracted from satellite resolution images and Land Surface Temperatures (LST) in a semi-arid region. By employing the LCZ approach, the study seeks to understand how LCZs influence LSTs in this specific environmental context. This study consisted of four main steps: Image preprocessing, LST retrieval, LCZ map preparation and spatial analysis. In this way, the LCZ scheme was used to classify the study area based on two sets of built-up types and land-cover types. Google Earth was used to specify training areas under study and to define different LCZ types. The Split Window Algorithm (SWA) was used to retrieve LST from Landsat-8 TIRS. The results showed that the built type and the land-cover type behave like two independent sets of patterns in the study area. The build type set fluctuated in a higher LST range than the cover land set (forest, farmlands and bushes). By shedding light on the relationship between the surface properties of LCZs and LSTs, the study provides valuable insights into the factors influencing thermal dynamics in semi-arid environments. Armed with this knowledge, urban planners can develop more informed strategies and interventions aimed at mitigating heat-related challenges and improving overall urban livability. 

کلیدواژه‌ها [English]

  • Land Surface Temperature (LST)
  • Land cover
  • Local Climate Zones (LCZs)
  • Urban morphology
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نشریه محیط زیست طبیعی
دوره 77، شماره 2
شهریور 1403
صفحه 371-384