Evaluation of the physical development pattern of Bonabcity using Shannonʹʹs and Holden entropy models

AbstractIn recent decades, cities in Iran, like many third world cities have significantly changed, so that urban growth trend are caused unbridled growth and cities with national and regional role in the wake of the economic and social developments which is due to the lack of appropriate policies and construction and without planning in the exploitation of urban lands in the most of cities. Urbanization has priority over the Urbanism and urban development is faced with serious problems. Bonab, like many cities in the country is not immune from these developments. Surveies of data shows that the cityʹs population has increased more than 2.5 times during 30 years ago, the growing population is caused unchecked spread of city. So that, increasing the physical expansion of the city has made problems such as destruction of agricultural land around the city, environmental problems, lack of infrastructure and etc. Research method in this study was descriptive – analytical and has analyzed the physical - spatial expansion of the city using the Holden Model. The results of Holdern model show that 36 percent of the cityʹs physical growth in 1976 related to the population growth and 64 percent was related to the horizontal growth and Aspral of the city in 2006 which has led to the impure density reduction of population and increasing the impure poll-tax of urban land. Its cause has been issues such as economic, urban politics, communication networks, urban development plans, lack of monitoring and control of city manager and also the lack of a systematic plan for the physical development of the City.