[1]ZHANG Jiayu,BAI Linbo,YANG Meiling.Spatial and Temporal Evolution of Yinchuan Urban Expansion in the Last 30 Years[J].Research of Soil and Water Conservation,2019,26(05):359-365.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 05
Page number:
359-365
Column:
Public date:
2019-09-06
- Title:
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Spatial and Temporal Evolution of Yinchuan Urban Expansion in the Last 30 Years
- Author(s):
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ZHANG Jiayu, BAI Linbo, YANG Meiling
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College of Resources and Environment Science, Ningxia University, Yinchuan 750021, China
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- Keywords:
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urban spatial expansion; RS image; GIS; Yinchuan City; spatial and temporal evolution
- CLC:
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F293.2
- DOI:
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- Abstract:
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Base on Landsat TM/ETM/OLI images of five periods (1991, 1999, 2006, 2011 and 2017), and supported by RS and GIS software, human-computer interaction was used to extract the boundaries of Yinchuan built-up area in five periods. The spatial and temporal evolution feature of urban expansion in Yinchuan was analyzed based on the index of spatial expansion intensity, barycentric coordinate, compactness index and fractal dimension. The results showed that:(1) on time sequence, the city extended rapidly in the other three periods except for slow expansion from 1991 to 1999; the expansion strength was 20.32%, and the expansion rate was 7.88 km2/a; in 2017, the area of Yinchuan construction area increased by 204.96 km2, which was 6.29 times of that in 1991; (2) on spatial pattern, the construction area expanded from east west separation to integrated development, and the center of the city generally shifted to the southeast; the main direction of expansion was towards the southeast and east with expansion distances of 45.44 km2 and 41.49 km2, respectively, while the expansion was less in the south and in the north with only expansion distance of 6.26 km2 and 8.05 km2, respectively; (3) on urban form, the compactness increased gradually from 0.17 to 0.32, and the fractal dimension decreased gradually from 1.71 to 1.25, indicating that the main expansion was the inner and edge filling in the whole study period, and the spatial form of the urban expansion had been simple and stable.