عنوان مقاله [English]
The city’s physical expansion takes place in a dynamic and continuous process over the time. The physics of city has been developed in both horizontal and vertical directions in quantitative and qualitative terms. Various factors are involved in the physical expansion of the city. In most cases, different temporal and spatial conditions of cities make a variety of different factors to influence in the development of the physical expansion of each city. In term of type, this is a practical article and, is a case study in terms of method. The researcher has deeply and comprehensively studied the characteristics of this phenomenon in a given period of time and has collected a large amount of information and data about it. Analytical logic has been used in this method and the researcher has tried to analyze and explain the phenomenon. At the beginning of this study, we have investigated and evaluated definitions and theoretical concepts of the physical expansion of the city and the factors affecting it. Then, in order to recognize the factors of attraction and repulsion in the physical expansion of the Danesfahan, information layers have been provided for land cover, accessibility and physiography of Danesfahan. And these layers are investigated to measure the physical growth of the city relative to its original core. Information layers have been integrated using GIS. The importance of different factors and layers has been determined by applying ANP multi-criteria decision-making method. To predict the future physical growth and expansion of the city based on its influential attraction and repulsion factors, Spatial Classification of the areas suitable for the physical expansion of Dansfahan has been analyzed by Fuzzy Logic. In this paper, at first, we have tried to identify and evaluate the effective attraction and repulsion factors in physical expansion of Danesfahan. Considering the internal and external relations of attraction and repulsion factors, the importance of the information layers of each factor is determined using the ANP method; and fuzzy spatial classification is performed for evaluating the physical expansion of Dansfahan using fuzzy logic in the GIS. ANP method is one of the most recent multi-criteria decision-making methods, which determines the importance of criteria and sub-criteria based on internal and external relations between factors and using the relevant Super matrixes. The fuzzy method has been used considering its capability in uncertainty to express concepts in the integration of maps. In 1995, Danesfahan was recognized as a city. The initial core of the city was destroyed after Buin Zahra earthquake in 1962 and city was also rebuilt in the same year. In the process of physical expansion of the city, access to the main road leading to the city and the road between the villages are considered as attraction factors and irrigated agriculture and gardens are considered as repulsion factors. Some of the most important criteria in physical expansion used to estimate the city’s capability for expansion are: Accessibility criteria including the sub-criteria of access to the urban area, communication paths, the high pressure line, the main gas pipes; and the land cover criteria with the classification of irrigated, dry land, mixed, garden and arid agriculture; and the physiography criterion which includes the sub-criteria of slope and distance from the fault. Analysis network process (ANP) model has been used to determine the importance and significance of each criterion and sub-criterion. Fuzzy method was used for spatial modeling of information layers in Arc GIS software environment; and the various layers have been integrated and finally a spatial organization was proposed based on the map of areas that are prone to future expansion of Danesfahan city. The proposed organization emphasizes the expansion of the city to the northwest of the current range along with considering the Special managerial strategies and guidelines. The main strategies are provided for managing land cover in the predicted areas, including:
• Direct supervision of the municipality and city management on lands located in the area under the city’s rule and provision.
• Owning lands around the city, especially lands that are located in the direction of the city’s physical expansion, in order to prevent land rentiers and unplanned expansion.
• Planning the infrastructure management and proper land use in the predicted directions for the future expansion of the city.
• Adopting measures for organizing the land use of the proposed beltway areas.
• Avoiding scattered construction.
• Developing an integrated plan for the spatial organization of potential areas for the future expansion of the city.
• Encouraging citizens for continuous participation in city’s decisions related to city development and expansion.