Determination of optimum areas for the landfill with emphasis on the urban expansion trend based on the combination of the Analytical Hierarchy Process and the Ordered Weighted Averaging model

According to the urban irregular expansion and the absence of appropriate consumption patterns, the most reasonable and low-cost method for the disposal of urban wastes is the landfill. Today, creating suitable places for the landfill is getting more difficult due to the urban expansion and development as well as the increase of public opposition. for this reason, it is recommended that to not choose places which located in the direction of the urban future expansion and residential areas growth. therefore, the main aim of the current study is to determine the optimum location for the landfill, regarding the urban physical expansion of Tehran city in a 28 years period Taking into account the risk parameter in decision making. In the current work, in addition to environmental, social and climate criteria for investigating Tehran physical expansion, Landsat satellite data from 1367 up to 1395 was used. In the present paper, weighing the different criteria of the paired comparison and The Ordered Weighted Averaging model is used to extract the appropriate suitable Place, taking into account the concept of risk in decision making. Lastly, suitable places for waste landfill have been selected considering the trend of urban expansion in different geographic directions over the past 28 years. The results of the Ordered Weighted Averaging model indicate that the maximum and minimum area of the suitable place for waste landfill are selected in the OR and AND modes, respectively. Investigations implied that the best places for the landfill are southern, southwest and western areas of Tehran. But due to considering the expansion of the city in different geographical directions over the past 28 years, the final suitable Place for waste landfill is the appropriate options in the geographic direction of southern Tehran.