Metropolitan spatial development pattern analysis and risk factors in Mashhad

In today's world of tools and techniques for planning a great deal of progress has been However, a theoretician of urban planning of the various models used to measure the growth and development of cities. The descriptive-analytic study, researchers used quantitative methods, population density, and metropolitan size, model, and model Holdern entropy, to determine the spatial pattern of metropolitan development Mashhad. The results show that the growth rate is reduced and the dispersed metropolis, Mashhad metropolis is the compression of moving. It also shows that the size of the metropolitan area of ​​Mashhad metropolis during the period 1270 to 1390, 47 times and 56 times the population of the metropolitan area. Results Holdern equation identifies, On average, one-tenth of urban growth is not due to population growth and increased But also due to factors other than population growth that Holdern the horizontal distribution of calls made​​; In other words, the process of urban growth, Mashhad metropolis during the period (1355-1390), 9% of expansion of urban decline and the population has increased. The results of the analysis of metropolitan development Mashhad in the past half century; Reveals the fact that the plans and projects of urban planning developments and issues that have arisen not respond to an Unthought and uneven urbanization is occurring Such a form of development, the model of a coherent body of a patient who has lost his space.