Modeling surface albedo coefficient derived from sebal algorithm to estimate the level of snow cover (case study : chegeni basin(

Document Type : Research Article


1 مدیر گروه علوم و فناوریهای محیطی، دانشکده علوم و فنون نوین دانشگاه تهران

2 Watershed Management Engineering, Faculty of Agriculture and Natural Resources, University of Malayer

3 Watershed Management Engineering Faculty of Agriculture and Natural Resources, University of Lorestan,

4 Ecohydrology Engineering, Faculty of New Sciences and Technologies, University of Tehran


This study was conducted in chegeni mountainous basin, with an area of 1836 Km2 .It is sub-basin of Doab Kashkan, that located in the north of the Lorestan province So that Landsat 7 Satellite ETM+ imagery sensor, selected for studies and correction of missing lines was conducted and albedo Surface amount, calculated by using Sebal algorithms. Since the except snow, two phenomena yellow and white sand and water have greater than 0.3 albedo, then the snow cover map were provided for α > 0.3, α > 0.35, α > 0.4, α > 0.45 , α > 0.5 and α > 0.55 albedos. To extract snow cover with sufficient precision, with this assuming, that snow cover is unknown, unmonitored classification was conducted for the albedo, then with applying of monitored classification on primary corrected image. The snow cover amount, was estimated, and kappa coefficient selected for evaluate the results of monitored classification and unmonitored classification for the mentioned albedo. The results showed that kappa coefficient for α > 0.45 albedo, has highest value 0.85. So α > 0.45 albedo can extract snow cover to an acceptable level for us.


Main Subjects

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Volume 5, Issue 2
July 2018
Pages 627-637
  • Receive Date: 22 June 2017
  • Revise Date: 21 February 2018
  • Accept Date: 02 January 2018
  • First Publish Date: 22 June 2018