study of tehran megalopolis hinterland using time and gravity models

cities have hinterlands which depend on various factors such as economic power, population, distance and etc. tehran megalopolis has also numerous hinterlands .tehran as the capital city of the country is considered at the top of urban system hierarchy and has a very special place from economic, political, educational and etc. points of view. all these abilities cause a daily stream of people from the towns in the vicinity entering for work and business and returning home at the end of the day as their activities are over. also thousands of university students and professors commute between tehran and suburban towns every day. considering all of these items defines tehran hinterland. then the question is that what areas would make tehran megalopolis hinterland? because of economics, presentation of services and so on determining tehran hinterland is of a great importance. this paper shows that towns closer to tehran are more influenced than other ones. the south, southwest and the west of tehran are more likely to be affected as for the ease of access, concentration of population and economic activities.