Site selection for waste landfill in the new city of Hashtgerd using multi-criteria decision-making models AHP and TOPSIS
Subject Areas : Water and EnvironmentSIAVASH MOHAMMADI BIGDELI 1 , Saeed malmasi 2 , Mozhgan Zaeimdar 3 , mehrdad zamanpour 4
1 - PhD Student of Environmental Management, Islamic Azad University, North Tehran, Iran.
2 - Assistant Professor of Environmental Management, Islamic Azad University, North Tehran, Iran. *(Corresponding Author)
3 - Assistant Professor of Environmental Management, Islamic Azad University, North Tehran, Iran.
4 - Associate Professor of Fars Agricultural and Natural Resources Research Center, Shiraz, Iran.
Keywords: Wetland, land use/cover, remote sensing, watershed, Taskh.,
Abstract :
Background and Objective: Changing the cover/use is one of the factors that affect the natural cycle in the ecosystem. Knowing about changes in coverage/use is one of the important things in planning in the country. The purpose of this research is to reveal the changes in the cover/use of Tashk watershed using TM images of Landsat satellite during the years 1998, 2008 and 2018.
Material and Methodology: To carry out this research, using the supervised classification method, the maximum probability land cover/use map related to three time periods 1998, 2008, 2018 was prepared.
Findings: The results of the research showed that the extent of the water body of Tashk lagoon decreased from 10.56% to 2.97% in the first ten years of the study period and decreased to 0.15% in the second ten years of the studied period, which can be almost considered a dry wetland. Also, salt marsh lands, which are caused by the receding of the lagoon water, have increased significantly. Barren lands, which are caused by the decline in the quality of pastures and uncultivable agricultural lands, have increased during the period under review.
Discussion and Conclusion: In general, based on the trend of land use/cover changes in this basin, it can be concluded that the environmental condition of this basin, especially the Tashk wetland, is very fragile and is in the process of completely losing its viability.
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