Determination of Breaking Point for Tehran Metropolis Using Gravity Model
Rahim Rezaei

Abstract
No demographical center exists independently and all internal changes of human societies are resulted from belonging to those sets which based on the term case are known as geographical space, system or network. Inside the system or network, there are some relations between elements which have associated them to each other, but the degrees of their relation to each other are not the same. Tehran’s municipal zone is also in the form of a network, where 52 cities surround it and have relations with it. Now, this question is set forth: to what degree is the relation of Tehran’s surrounding cities with Tehran? In this paper, using the gravity model (gravitational force) and considering variables such as population, distance and access time, the breaking points between Tehran metropolis and each of its surrounding cities have been determined. It should be noted that without considering the access time, these breaking points are not precise. The obtained result suggests that the gravitation power of Tehran metropolis is higher around southern, south-western and western regions. Also, the research method is library research and study of documents and evidences.

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