Study on Urban Land Expansion and Spatial Morphology Evolution in Wuhan(1949-2013)
In the process of rapid urbanization,the disorderly and inefficient expansion of urban land has given rise to numerous urban problems.Revealing the tempo-spatial trajectory and pattern of expansion is an important prerequisite for controlling and solving problems.Taking Wuhan as an example,the study is based on the 1949,1966,1978,1996 and 2013 urban land mapping maps,which are digitally translated in GIS.Comprehensive use of indicators such as expansion intensity,compactness,and fractional dimension number,as well as quadrant,gravity center,and standard deviation ellipse are applied to study urban land expansion and spatial morphology evolution.The results show that:(1)the spatial morphology of Wuhan has gone through four stages of"nucleated-banded-ringed-radiated";(2)the difference of expansion before and after the 1990s is obvious,and the direction of expansion has changed from linear to cross and finally dispersed;(3)the urban compactness is low and decreasing,and the land fragmentation degree is high.The fractional dimension is in the stage of"filling and expanding",with periodic high and low fluctuations;(4)the gravity center trajectory is in a U-shaped cycle,and the distribution of expansion has changed from a band-like aggregation to an all-round dispersion.This paper can provide theoretical support for research on urban land use layout and morphology,as well as historical reference for urban planning and policy makers to promote urban spatial optimization and coordinated sustainable development.
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