基于长江三角洲实际的陆路交通网,考虑了地表的阻隔水域以及道路的类型和等级,根据最小种子算法,采用MapX和Delphi,开发了区域时间可达性计算与分析模块,生成了长江三角洲4级城市的时间可达性扩散图和基于时间可达性的吸引范围图。结果表明,上海作为一级城市,其吸引范围能够覆盖整个长江三角洲,呈现出以上海为中心,依照时间可达性由小到大的顺序沿沪宁、沪杭交通线向外辐射的扇形分布模式。二级城市的吸引范围呈现出以上海、南京和杭州为中心,依照时间可达性由小到大的顺序沿沪宁、沪杭交通线的圈层分布模式。三级城市1小时的吸引范围呈现出以15个地级及以上级别城市为中心,沿沪宁、沪杭、杭甬、宁通交通线的"之"字形带状分布模式。四级城市的1小时吸引范围几乎覆盖整个区域,呈现出以81个城镇为核心,以高等级公路和铁路为轴线的网络化分布模式。随着跨江、跨海通道的建成,各级城市的吸引范围向南、北扩展的速度加快。
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.
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