Spatial Concentration and it's Effecs on the Physical Extension and Spatial Structure of Sanandaj City

Spatial concentration is the geographic distribution of government revenues, industry, commerce and population in one or more locations, resulting in regional inequalities in living conditions. Taking into consideration the cities of Sanandaj, there has not beenexception from this principle and the past decades under the effect of different, economic, political, legal and other factors have faced lots of spatial changes.The aim of this paper is to study the effects of concentration politics of administrative-political, economic and service infrastructures on Sanandaj physical extension changes and its spatial structure through recent decades.In this paper, population spatial concentration and activities levels in Sanandaj and its spatial outcomes have been verifird by using descriptive, analytical and statistical methods and the application of models such as Shannon's Entropy Model and Willyamson Index.Research results show that a relatively high concentration administrative infrastructure, political, economic and services in the city of Sanandaj and the surrounding areas have led to population concentration and the incidence of spatial adverse effects such as thechaos and sprawl of physical growth of the city and the resonance of informal settlement phenomenon. In some areas, especially in northern parts of Sanandaj this condition has been clear. Moreover, the spatial distribution analysis of urban land use in Sanandaj indicates unequal distribution of activities and servies between various areas ofthe city.