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Environmental Impact Assessment of the Largest Man-Made Lake of Iran by Using Environmental Modeling and GIS/RS

Dr. Alireza Gharagozlou
Manager of Public Relations & International Affairs of NCC
National Cartographic Center of Iran (NCC)
Tehran, Iran
Email: agharagozlu@yahoo.com

Dr. Jafar Nouri
Manager of Department of Environmental Managment - Azad University, Azad University of Tehran, Iran
Email: sotodeh7@hotmail.com

Mojgan Hejrani Diarjan
Expert of Satellite Image Processing – NCC, Iran
Email: mojhej@hotmail.com

Like many cities in other countries, the city of Tehran is experiencing increasing pressure of improper land use and incorrect land management policies have exacerbated the problems by disregarding the limitations and potential of land, and its vulnerability and fragility against possible changes. The use of GIS and Remote Sensing techniques during the last decade are increasing being applied now for identification of natural resources and for the management of urban and environmental projects for the major cities in Iran. But the practice of analyzing the development models with the use of GIS and Remote Sensing Results in urban development planning is a new experience. It should be clear that presenting an urban development model to be used in a GIS has a lot of restrictions and limitations whose description would lead too far here.

The implementation of suggested plans and projects will be carried out for District22, such as the establishment of the west urban man-made lake as the largest man-made lake of Iran, based on detailed feasibility studies.

In the present study, on Environmental Impact Assessment (EIA) study for the largest man-made lake in Iran by using environmental modeling in GIS with a land use planning approach and with regards to the ecological environment and by using results of satellite image processing (TM and ETM+ images between 1994 to 2001) was performed. The area observed is district 22 in north-western Tehran, a region of about 10 000 hectares which is restricted by the Alborz mountain chain in the north, the Kan River in the east, the Tehran-Karaj freeway in the south and the short mountains of Karevansarasangi in the west.

This study aims at considering major changes on human environments, caused by proposed project execution in the District22 of Tehran by using Remote Sensing technology and analysis of satellite data and GIS. Then, by using environmental modeling and using GIS, decision can be made based on the capacities and environmental balances of the area by applying the results of different analyses in GIS, regarding whether the projects are operational and where is the best location for making the largest man-made lake of Iran and how they could be improved.

The socio-economic and cultural situation of the District has also been described in the form of implementation of the plan by using the results of satellite data analysis and GIS results. The interactive effects of the activities and suggested actions of the implementation of the plan have been specified during the constructional and operational phases. Finally, the strategic and management plans for the location of man-made lake and environmental impact assessment from economic and social viewpoint are suggested to reduce the negative effects.