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Computing the Urban Sprawl Dynamics through Fractal Geometry

Nisar Ali

Abstract


Urban sprawl has become a very magnificent topic throughout the world since last decade. Various techniques, methodologies and quantitative approaches are based to measure urban sprawl in previous researches. In this research a different idea of fractal analysis is introduced to analyze the urban sprawl. In addition density gradient and sprawl index techniques have also been used to characterize the urban sprawl in Karachi. In this study, we have discussed the urban sprawl of Karachi from its first census (1951) to 2012. Massive flight of the population is recorded between 1981 and 1998 to the periphery of city Karachi. As a result central population density decreased at rapid space and population density gradient exhibits a gentle slope. Overall population density of Karachi constantly increases from 1951 to 1998 but it decreases in 2012 because large rural lands were converted into urbanized lands during 2002 to 2012. For the same six time periods, urban form of Karachi is also quantified through fractal analysis in the context of urban sprawl dynamics. Our results suggest that the fractal dimension of urban form is proportional to the urban sprawl index for the concentrated urban growth patterns. We have also tried investigating sprawl phenomena theoretically further, we have probed the causes and impacts of urban sprawl in Karachi in a given time periods.


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References


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