عوامل و متغیرهای موثر در تبیین بخش مرکزی شهرهای میانی (مطالعه موردی شهر بوکان)

City central district in which the most important events of a city take place, has different features in different cities according to specific conditions of the city. However, in spite of the significance of this district in the city space, the research in this field has been done with an emphasis on big cities and mainly for problem-solving purpose. In this research, therefore, a framework consisting of economic( land and shopping value, employment density and distribution of financial, insurance and social security institutions), historical ( the historic core of the city, stages of city development and symbolic elements of the city), social ( public spaces of the city, density of cultural centers, population density, population density in specific parts of day and social status), traffic ( center place for traffic, transport station density of city and accessibility), governmental (activity of governmental and public office centers) and physical- spatial factors ( building density, historic fabric, specific architecture, urban development pattern and land use pattern), has been presented. Through analyzing urban space of Bookan as an intermediate city located in Iran, the role of the above-mentioned factors in the development of its central district has been investigated. Then, the major factors contributing to explanation of this district were identified. The results showed that in Bookan, historic and economic factors among the set of factors influencing the central district, were the most important of ones; governmental function has been decentralized and functional and activity variances is the major features of city central district of Bookan compared to the other parts of the city. Findings also showed that the city central district of Bookan included the most important activities of city and, therefore, by including wide range of different activities has different functions and, thereby, its boundary basically differs from other parts of the city from this perspective.