Characteristics and influence factors of urban sprawl of Dar es Salaam from 2002 to 2012

doi:10.7523/j.issn.2095-6134.2018.05.013

Abstract

Abstract: Based on the land-use classification data (2002, 2007, and 2012) and field investigation, the pattern and influence factors of the urban sprawl of Dar es Salaam were studied. Sector analysis, concentric circle analysis, elasticity ratio of urban land growth, and expansion intensity index were employed in the analysis. The results are showed as follows. 1) The sprawl of Dar es Salaam was characterized by high expansion degrees and increasing expansion speeds from 2002 to 2012, which presented the rapid urban-rural mixed development accompanied by the continuous growing of informal settlements. The occupied lands during the expansion were mainly bare lands and vegetation. 2) The built-up areas mainly spread along the arterial roads and around the city center from 2002 to 2007, while the spread was characterized by filling the open areas between arterial roads or along the urban edges from 2007 to 2012. Therefore, the urban space-form evolved from finger-like to block-shaped. 3) The built-up areas spread mainly towards northwest, west, southwest, and southeast, and the southeast of the city became an important area of spreading. Furthermore, the urban sprawl showed a significant distance attenuation feature. 4) The urban sprawl of Dar es Salaam was mainly affected by the growth of the population and economy, the improvement of traffic conditions, the policy changes, and the land tenure system. Transportation facilities played an important role in guiding the spatial expansion pattern.

Key words: urban sprawl, informal settlements, expansion intensity index, Dar es Salaam

CLC Number:

K915

ZHANG Jiaqi, CHEN Shuang, Damas W. Mapunda. Characteristics and influence factors of urban sprawl of Dar es Salaam from 2002 to 2012[J]. , 2018, 35(5): 663-673.

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