تخمین غلظت کلروفیل آ در دریاچه سد اکباتان با استفاده از تصاویر سنجش از دور

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد/ دانشگاه بوعلی سینا

2 استاد/ دانشگاه تهران

3 همدان/ دانشگاه بوعلی سینا

4 گروه مهندسی بهداشت دانشگاه علوم پزشکی ایلام

چکیده

پایش کیفی منابع آب و به ویژه مخازن سدها بسیار حیاتی می­باشد اما نمونه­برداری از آب دریاچه پشت سدها بسیار وقت­گیر، هزینه­بر و همراه با مخاطرات متعدد است. تصاویر ماهواره­ای و هوایی از آب­های سطحی را می­توان به عنوان ابزاری مفید جهت پایش پارامترهای کیفیت آب در پیکره­های آبی استفاده نمود. در این مطالعه امکان شناسایی و پایش غلظت کلروفیلa در مخزن سد اکباتان با استفاده از تصویر لندست 7 بررسی شد. به این منظور تبدیلات مختلفی روی بازتابش باندها اعمال شد و رابطه بین غلظت کلروفیل با بازتابش بررسی و استخراج شد. سپس بهترین مدل برای تخمین غلظت کلروفیلa انتخاب شد. نتایج مطالعه نشان داد رابطه به­دست آمده براساس نسبت باندها دقیق­ترین تخمین را از بین مدل­های به دست آمده ارائه می­دهد. مقدار R2Adj برای این مدل برابر 91/0 و مقدار SE نیز معادل 04/0 به دست آمد. نتایج نشان می­دهد که می­توان با استفاده از تصاویر لندست 7 غلظت کلروفیلa را با دقت قابل قبولی تخمین زد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Estimation of Chlorophyll-a Concentration Using Remote Sensing Images

نویسندگان [English]

  • Abdollah Taheri 1
  • Mohammad Reza Serajian 2
  • Maryam Ghashghaie 3
  • Keywan Weysi 4
1 Bu Ali Sina University
2 University of Tehran
3 Bu Ali Sina University
4 Ilam University of Medical Sciences
چکیده [English]

Monitoring the quality of water resources and reservoirs is very important however water sampling is a very time consuming, costly and sometimes dangerous task. Satellite and aerial images from surface water could be applied to monitor water quality parameters of different water bodies effectively. In this research the possibility of estimating and monitoring chl-a concentration in Ekbatan reservoir is evaluated using Landsat 7 images. Different conversions were applied to bands reflectance and the relation between chl-a concentration with reflectance were examined and derived. Then the best model for estimating the concentration of chl-a was selected. The results of study showed that the equation based on the band ratio have the most precise estimate between all models. The value of R2Adj and SE were 0.91 and 0.04 respectively. The results show that using Landsat 7 images the concentration of chl-a could be estimated accurately.

کلیدواژه‌ها [English]

  • Ekbatan Dam
  • Eutrophication
  • Landsat 7
  • Water quality

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تحقیقات آب و خاک ایران
دوره 49، شماره 1
فروردین و اردیبهشت 1397
صفحه 39-50

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