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Multi-temporal landsat images based on eco-environmental change analysis in and around Chah Nimeh reservoir,Balochestan (Iran) |
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| Authors: | Fazel Amiri Vahid Rahdari Saeideh maleki najafabadi Biswajeet Pradhan Tayebeh Tabatabaei |
| Institution: | 1. Department of Engieering, Bushehr Branch, Islamic Azad University, P.O. Box 751961955, Bushehr, Iran 2. Faculty of Natural Resources, Zabol University, Zabol, Iran 3. Department of Engineering, Geospatial Information Science Research Centre (GIS RC), Universiti Putra Malaysia (UPM), Kuala Lumpur, Malaysia 4. Department of Civil Engineering, Universiti Putra Malaysia (UPM), Kuala Lumpur, Malaysia |
| Abstract: | Chah Nimeh reservoirs have served as a water storage facility, especially during droughts over the last three decades. It is also an important wintering site for migratory birds. In this study, thematic mapper time-series data were derived from Landsat images for prolonged droughts that occurred in two satellite images (2002 and 2011). The data derived from these images were used for the detection of changes in land cover and water storage in the reservoirs. First, a vegetation cover map was produced using soil-adjusted vegetation index and field sampling. Subsequently, land use/cover maps were generated using supervised and hybrid image classification method. Using the spatial change detector (SCD v1.0) software extension, the layers were combined and the change map was generated. The overall accuracy of the produced thematic images was assessed in regards to quantity and allocation disagreements. A total of five classes were defined in this investigation: deep water, shallow water, vegetation, salt land and bare land. The results showed that during the period of study, water volume reduced and vegetation cover increased, especially around the reservoirs that are important as shelter for wintering migratory birds. Comparison of land use/cover maps showed the increase in total available surface of shallow water, which indicated an increase in the habitats for surface feeding and diving birds. |
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