بررسی تاثیر تغییرات پهنه آبی سد تهم در نوع کاربری اراضی و دمای سطح زمین با بهره گیری از شاخص های طیفی NDWI، MNDWI و AWEI و ماشین بردار پشتیبانی SVM در بازه زمانی 2002 تا 2023

نوع مقاله : پژوهشی

نویسنده

دانشیار گروه جغرافیا، دانشگاه زنجان، زنجان، ایران

چکیده

تغییرات مکانی و زمانی آبهای سطحی بر ساختار و عملکرد اکوسیستم های منطقه سد تهم و همچنین توسعه کشاورزی، اقتصادی و اجتماعی در این منطقه تاثیر می گذارد. در این تحقیق به منظور تشخیص تغییرات طولانی مدت سد تهم در بازه زمانی 2002 تا 2023 از شاخص های MNDWI، AWEI و NDWI و مدل ماشین بردار پشتیبانی SVM استفاده شد. نتایج حاصل از شاخص AWEI نشان داد که مساحت پهنه سد در سال 2007 حدود 4/2 کیلومتر مربع بوده که در طول سال 2023 به 15/1 کیلومتر مربع کاهش یافته است. در شاخص MNDWI نیز در سال های 2007 و 2023 حجم آب به ترتیب معادل 6/2 و 17/1 کیلومتر مربع بوده است. نقشه NDWI کاهش 38/46 درصدی سطح پهنه آبی را از سال 2007 تا 2023 نشان می دهد. لیکن در شاخص AWEI این میزان کاهش معادل 9/47 بوده است. شاخص AWEI با مقادیر کاپای معادل 94/0 حدود پهنه های آبی را به درستی تشخیص داده است. بر اساس مدل SVM در این بازه زمانی میزان پوشش گیاهی با کاهش مواجه گردیده و از 8/0 کیلومتر مربع در سال 2002 به 07/0 کیلومتر مربع در سال 2023 کاهش یافت. میزان زمین های بایر تقریبا در این بازه زمانی کاهش یافته و معادل 57/4 کیلومتر مربع در سال 2023 بوده است. میزان حداکثر دمای سطح زمین در ماه جولای سال 2002 معادل 3/38 درجه سانتیگراد بوده و در ماه جولای سال 2023 به 4/28 درجه سانتیگراد رسیده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the effect of changes in the water zone of Teham Dam on land use type and land surface temperature using NDWI, MNDWI and AWEI spectral indices and SVM support vector machine in the period from 2002 to 2023

نویسنده [English]

  • mehdi feyzolahpour
Associate Professor, Geomorphology, University of Zanjan, Iran
چکیده [English]

Spatial and temporal changes of surface water affect the structure and functioning of the ecosystems of the Teham Dam region as well as the agricultural, economic and social development in this region. In this research, MNDWI, AWEI and NDWI indices and SVM support vector machine model was used to detect the long-term changes of Teham Dam in the period from 2002 to 2023. The results of the AWEI index showed that the area of the dam was about 2.4 square kilometers in 2007, which decreased to 1.15 square kilometers in 2023. In the MNDWI index, in 2007 and 2023, the area of water was equal to 2.6 and 1.17 square kilometers, respectively. The NDWI map shows a 46.38% decrease in the area of the water zone from 2007 to 2023. But in the AWEI index, this decrease was equal to 47.9. AWEI index with kappa values equal to 0.94 has correctly recognized the boundaries of water areas. According to the SVM model, in this period of time, the amount of vegetation has decreased from 0.8 square kilometers in 2002 to 0.07 square kilometers in 2023. The amount of barren land has decreased almost in this period of time and was equal to 4.57 square kilometers in 2023. The maximum temperature of the earth's surface in July 2002 was equal to 38.3 degrees Celsius and in July 2023 it reached 28.4 degrees Celsius.

کلیدواژه‌ها [English]

  • Spectral index
  • SVM
  • AWEI
  • MNDWI
  • Teham dam
  • Zanjan
  • Iran
 
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