applying the boolean logic and simple additive weighting in geomorphological site selecting of urban waste material landfilling (case study: saqqez city)

abstract in current world environmental and mainly urban wastes are originated mostly from massive human habitat areas, and have caused disturbance, uncomfortable landscape, environmental risks and dissatisfaction. saqqez city with a population of 140000 is one of the largest cities in kurdistan province. due to population increase, consumptions and changes in nutritional habits of people, the use of packaging materials besides imitating consuming pattern have all in recent decades increased the waste volume produced in the city. despite this problem, there is not still an appropriate way to solid waste disposal in this city. the main goal of this study is applying the role of geomorphic agents in suitable site selecting of urban wastes landfilling. at first stage, operative factors were considered in site selection disposal place and finally by digitizing and weighting, thirteen layers categorized based on existing standards. these layers include: slope, erosion, fault, surface water, ground water, wells, protected area, airport, plant covers, communication lines, power lines, and distance from city and population centers. the above layers were entered to edrisi and arc gis software and specific database formations were prepared for urban waste landfilling and multi criteria decision making models such as boolean logic and simple additive weighting method in layers were performed. then results indicated that boolean method was not accurate enough in site selection in early and final stages in south of saqqez, but simple additive weighting model was more useful at the early stages by introducing four places and a final location for disposal. finally, overlap and ensemble of these models and subscription in arc gis environment, a final landfill site was introduced which has an area of 74 acres for accepting about 130 tons of waste per day for 20 years.