جغرافیا و روابط انسانی

جغرافیا و روابط انسانی

بررسی تاثیر تغییرات کاربری بر محیط بیوفیزیکی ساحل رودخانه سفیدرود در محدوده شهر رودبار با بهره گیری از مدل جنگل تصادفی (RTC) و شاخص های طیفی و تاثیر آن بر شرایط حرارتی سطح زمین (LST)

نوع مقاله : مقاله پژوهشی

نویسنده
استادیار گروه جغرافیا، دانشگاه زنجان
10.22034/gahr.2024.459099.2143
چکیده
در این تحقیق تغییر سریع کاربری زمین و تاثیر آن بر محیط های بیوفیزیکی مختلف در امتداد ساحل رودخانه سفیدرود مورد بررسی قرار گرفت. به این منظور، داده های سال های 1991، 2014 و 2023 از ماهواره های لندست 5 و 8 دانلود شده و به وسیله مدل جنگل تصادفی و شاخص های طیفی تفاوت نرمال شده پوشش گیاهی (NDVI)، تفاوت نرمال شده آب (NDWI)، شاخص اصلاح شده تفاوت نرمال شده آب (MNDWI)، شاخص تفاوت نرمال شده زمین بایر (NDBaI)، شاخص گیاهی تنظیم شده خاک (SAVI) و دمای سطح زمین (LST) پردازش شدند. روابط بین این شاخص ها با دمای سطح زمین نیز با استفاده از ضریب همبستگی پیرسون و ضریب تعیین R2 تعیین شده و صحت کاربری زمین در مدل جنگل تصادفی و هر یک از شاخص ها نیز به وسیله ضریب کاپا برآورد شد. نتایج نشان داد که روند کاهشی شاخص NDVI و SAVI با روند افزایشی شاخص های MNDWI، NDWI و NDBaI همراه بوده و این امر بر روی شاخص LST تاثیر گذاشته است. از بین شاخص های طیفی، شاخص MNDWI با مقادیر 45/0- در سال 2014 بیشترین همبستگی منفی را داشته و شاخص NDBaI با مقادیر 54/0 در سال 2014 بیشترین همبستگی مثبت را داشته است. در بین تمامی شاخص ها از سال 1991 تا 2023 روند کاهشی در همبستگی ها مشاهده شد. مقادیر حاصل از مدل جنگل تصادفی نشان داد که وسعت زمین های بایر با کاهش قابل توجه همراه بوده و از 52/8 کیلومتر مربع در سال 1991 به 82/4 کیلومتر مربع در سال 2023 کاهش یافته و به این میزان به زمین های با کاربری پوشش گیاهی تنک افزوده شده است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigating the impact of land use changes on the biophysical environment of Sefidroud river bank in the area of Rudbar city using random forest model (RTC) and spectral indices and its effect on land surface thermal conditions (LST)

نویسنده English

mehdi feyzolahpour
university of zanjan
چکیده English

In this research, the rapid change of land use and its impact on different biophysical environments along the Sefidroud River coast were investigated. For this purpose, the data of 1991, 2014 and 2023 were downloaded from Landsat 5 and 8 satellites and by means of random forest model and spectral indices of normalized difference of vegetation cover (NDVI), normalized difference of water (NDWI), index Modified normalized water difference (MNDWI), normalized barren land difference index (NDBaI), adjusted soil vegetation index (SAVI) and land surface temperature (LST) were processed. The relationship between these indicators and the surface temperature of the earth was also determined using the Pearson correlation coefficient and R2 determination coefficient, and the correctness of land use in the random forest model and each of the indicators was also estimated using the Kappa coefficient. The results showed that the decreasing trend of NDVI and SAVI index was accompanied by the increasing trend of MNDWI, NDWI and NDBaI indexes and this had an effect on the LST index. Among the spectral indices, the MNDWI index with values of -0.45 in 2014 had the highest negative correlation and the NDBaI index with values of 0.54 in 2014 had the highest positive correlation. A decreasing trend in correlations was observed among all indicators from 1991 to 2023. The values obtained from the random forest model showed that the extent of barren lands was accompanied by a significant decrease and decreased from 8.52 square kilometers in 1991 to 4.82 square kilometers in 2023, and by this amount, it was reduced to covered land. A thin herb has been added.

کلیدواژه‌ها English

Biophysical index
land surface temperature
Pearson correlation
land use
Sefidroud river bank
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  • تاریخ دریافت 03 خرداد 1403
  • تاریخ بازنگری 12 تیر 1403
  • تاریخ پذیرش 09 مرداد 1403