Document Type : Research Paper
Authors
1
Faculty of Architecture and Urban Planning, Iran University of Science and Technology, Tehran, Iran
2
Assistant Professor ٫Urban and Regional Planning, Faculty of Architecture and Urbanism, Iran University of Science and Tenchnology (IUST), Tehran,Iran
10.22059/jtcp.2025.384023.670512
Abstract
The spatial transformations of the Tehran metropolitan area over recent decades indicate a gradual shift from a highly centralized structure toward a polycentric pattern. However, the nature of this transition, its underlying mechanisms, and its structural consequences have been less systematically examined. This study aims to analyze the spatial transformation pattern of Tehran based on the theoretical framework of polycentricity and the concepts of urban hierarchy, connectivity, and spatial clustering. Using Urban Network Analysis, this research evaluates the spatial structure of the region through three components—nodes, links, and overall network structure—by employing centrality indicators (Degree, Betweenness, Closeness), functional hierarchical analysis, and clustering of urban centers.
The results indicate that despite the continued dominant role of Tehran at the top of the urban network, secondary centers such as Eslamshahr, Damavand, and others have been strengthened in recent years, and new secondary cores have emerged due to increased intra-regional linkages. Network indicator analysis also reveals a decline in centralization, growth in horizontal interactions among centers, and a shift of the region’s spatial network toward a polycentric pattern. Accordingly, this study proposes a model for developing a polycentric structure, which includes enhancing the functions of secondary centers, improving network connectivity among cities, and promoting a balanced distribution of economic and service activities across the region. Implementing this model could facilitate the formation of a more coherent, efficient, and sustainable spatial structure for the Tehran metropolitan area.
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