Urban Planning
Leyla Mohammadi Kazemabadi; Sedigheh Lotfi; Amer Nikpour
Abstract
Today, air pollution of large cities has caused major crises in economic, social, environmental and physical development. So that this issue has become the first priority for urban planners in order to curb the problem. Investigating the effects of urban form on air quality has been considered in both ...
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Today, air pollution of large cities has caused major crises in economic, social, environmental and physical development. So that this issue has become the first priority for urban planners in order to curb the problem. Investigating the effects of urban form on air quality has been considered in both experimental and theoretical research. Arak metropolis is unhealthy especially for vulnerable groups due to the presence of many sources of air pollution in more than half of the days of the year and now it is one of the eight polluted cities in the country. The present study attempted to evaluate the impact of city form indicators on the pollution of the city. The research results showed; There has been a significant relationship between the city form index and the dependent variable (air pollution index) at the 95% level. So that the R2 value obtained from the spatial analysis of the city form index on SO2, showed 72% and the influence of the city form on the production of this pollutant. The intensity of the effect is greater in zones 2 and 3 of Arak city. This study explored the regional form and air pollution in a city where the concentration of industrial plants exacerbated environmental situation. So urban planning and policies should be formulated in accordance with the city function and industrial structure of Arak metropolis.
Urban Planning
Sedigheh Lotfi; Mojtaba Shahabi Shahmiri; Sasan Roushenas
Abstract
In recent years, there has been extensive literature on spatial structure of metropolitan areas and its economic consequences, with emphasis on concepts of poly-centricity and agglomeration economies. Defenders of polycentric regions claim that these areas can make a balance between advantages and disadvantages ...
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In recent years, there has been extensive literature on spatial structure of metropolitan areas and its economic consequences, with emphasis on concepts of poly-centricity and agglomeration economies. Defenders of polycentric regions claim that these areas can make a balance between advantages and disadvantages of agglomeration to create competitive advantages comparing with mono-centric regions, while avoiding excessive concentration and congestion of competitor region. However, there are few studies that have examined these approaches adaptively. Hence, this paper aims to make a comparative study of two metropolitan areas of Shiraz and central Mazandaran to investigate some of the claims about links between spatial structure optimization and advantages of accumulation. The Methodology of the research is based on descriptive and statistical analysis such as Ciccone-Hall and Herfindahl index. The results showed that the spatial structure of the region with emphasis on the concept of polycentric and distribution is scattered and polycentric pattern of central region of Mazandaran against centralized and mono-centric Shiraz metropolitan area. In this context, from the perspective of the consumer, the lack of a dominant urban culture and urban environment should be considered as an important factor in the failure to achieve urbanization advantages. This is an obstacle to achieving higher performance services and facilities, especially lowering private sector investment. However, the findings from the analysis defend relatively equal diversification of production in region of Central Mazandaran against Shiraz metropolitan area, and consider it as a big factor to create complementary links between urban centers in the region. Also, it seems a polycentric pattern without sharing their resources in order to provide more facilities and Infrastructures in regional level cannot be defined in achieving localization advantages as a close rival to mono-centric metropolitan area.
