Exploring the Dynamics of Spatial Structure Using an Interaction Pattern (The Case of Mashhad Metropolitan Region, Iran)

In recent decades, remarkable changes have occurred in the spatial structure of metropolitan regions, creating a discontinuous, scattered and polycentric development which have significant implications for commuting patterns. this study examines the dynamics of the spatial structure using an interaction pattern in mashhad metropolitan region (mmr). four dimensions-centrality and dominance, network cohesion, interaction strength and levels and hierarchy-were used to analyze people flows in 1999, 2007 and 2012, showing that the interaction between mashhad and other cities in the mmr have increased over the time. the results show that the spatial structure of mmr is monocentric with traditional interaction patterns, in which mashhad is the central node of the region and other cities are dispersed in mmr. therefore, it is necessary to adopt an integrated approach to develop a polycentric metropolitan region in order to protect the environment and reinforce inter-city relationships, manage travel demand, reduce unnecessary trips, and restrict sprawl. these policies are led to more convergence and polycentric development.