Using MapX component and Delphi, the authors develop a program to calculate and analyze regional time accessibility based on minimal seed algorithm, thus generating a mark diffusing figure and city attracting scope. Based on land traffic network including highway, national way, provincial way and railway, this paper analyzes cities attracting scope. Some conclusions are drawn as follows. Shanghai is the first grade city. Its attracting scope covers the whole Yangtze River Delta (YRD) and presents a fan-like distribution along traffic axis of Shanghai-Nanjing and Shanghai-Hangzhou with Shanghai as its core. The second grade cities attracting scopes present rings along traffic axes of Shanghai-Nanjing and Shanghai-Hangzhou with Shanghai, Nanjing and Hangzhou as their cores. The third grade cities attracting scopes in one hour presents zonal distribution along traffic axes of Shanghai-Nanjing, Shanghai-Hangzhou, Hangzhou-Ningbo and Nanjing-Nantong with 15 main cities as their cores. The relationship between the third grade cities attracting scope and their administrative areas can be divided into four categories. The attracting scopes of Taizhou in Jiangsu province, Huzhou, Changzhou and Ningbo are greater than their administrative areas. The attracting scopes of Hangzhou, Shaoxing, Shanghai and Taizhou in Zhejiang province are tally with their administrative areas. The attracting scopes of Jiaxing, Nanjing, Wuxi and Yangzhou are misplaced with their administrative areas. The attracting scopes of Nantong, Suzhou and Zhenjiang are smaller than their administrative areas. The fourth grade cities attracting scopes in one hour almost cover the whole YRD and present network distribution along the high grade roads and railways with 81 counties as their cores. The attracting scopes of the fourth grade cities in the YRD form a regional spatial system. The attracting scopes of city have changed along with the construction of bridges and tunnels which straddle sea and the Yangtze River.
ZHANG Li, LU Yu-qi, ZHAO Yuan-zheng
. Delimitation of central cities attracting scope based on time accessibility: A case study of the Yangtze River Delta[J]. GEOGRAPHICAL RESEARCH, 2009
, 28(3)
: 803
-816
.
DOI: 10.11821/yj2009030024
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