عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Problem: Metropolitan cities In the More and Less Developed Countries (MDCs & LDCs) have been established for exploitation of economies of scale, hence metropolitan regions shaped by spatial-functional linking with peripheral areas. Increasing density and intensifying activities (housing and non-housing activities) in metropolitan regions aren't directly relevance to economies of scale; density and growth boundaries are determined by threshold population, ecological threshold, etc. Unplanned departure from mentioned thresholds creates and accumulating spatial problems in many metropolitan regions, especially in natural environments.
Purpose: Main purpose of this article, with descriptive-analytical approach, is discussing the unplanned spaces, shaped by metropolitan regions growth, and the metropolitan region of Tehran. Afterwards, consequence of unplanned growth discussed through planning and policy making process; for controlling produce and reproduce extended problems. Based on analysing of environmental impact of unplanned growth in the metropolitan region of Tehran, some recommendation extracted to establish a planning and managing mechanism to reduce natural environmental problems.
Methodology: For Identification and analysing unpleasant changes in natural environment, due to unplanned growth in metropolitan region of Tehran; a procedure has chosen in three steps: a) Theoretical foundation was reviewed, and also experiences from more and less developed countries compared to find a method for analysing metropolitan regions growth. b) Environmental Impact Assessment (EIA) methods reviewed to find appropriate method and indicators for analysing impact of metropolitan region growth on the peripheral natural environment. c) Impact of unplanned growth on the peripheral natural environment in the metropolitan region of Tehran defined and analysed by extracted method in step “b”.
Achievement: Generally, metropolitan regions growths are not planned and their natural impacts are not considered in planning and policy making process. This connivance will lead to produce and reproduce extended problems, like spatial confusion in economic, social, organisational and physical aspects; that causes exhaustion of resources and wasting economic, social, and physical capital. The main result of this article through the analysing the impact of metropolitan region growth on peripheral natural environment, is Emphasizing on establishing a planning and policy making mechanism in metropolitan regions to reducing, solving and preventing related problems.