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交通因素对城市空间扩展的影响是一个研究热点,但国内外关于桥梁-道路建设对山地城市扩展影响机制的研究还不多见。基于桥梁-道路对城市待开发区域区位的影响,提出了点状辐射、线状辐射和环状辐射3种影响机制。以重庆嘉陵江大桥和黄花园大桥建设对嘉陵江北岸影响为例,将研究区划分为5个分区,基于Arc GIS软件提取各分区城市建成区与河岸的空间分布关系,并通过5个分区1940~2009年城市扩展差异比较印证3种影响机制。研究结果表明,桥梁和道路建设促进研究区建成区迅速扩张,但对不同分区的建成区扩展速度的影响有差异;第3分区城市扩展反映了桥梁-道路对城市扩展的点状辐射和线状辐射,而第4分区城市扩展反映了桥梁-道路对城市扩展的环状辐射。结论表明研究提出的点状辐射、线状辐射和环状辐射符合桥梁-道路建设对西南山地城市扩展的影响机制。
The impact of traffic factors on the expansion of urban space is a hot research topic. However, there are still few studies on the impact mechanism of bridge-road construction on the extension of mountain cities at home and abroad. Based on the influence of bridge-road on the urban development area, three kinds of influence mechanisms, point-like radiation, linear radiation and annular radiation, are proposed. Taking the impact of the construction of Chongqing Jialing River Bridge and Huang Garden Bridge on the north bank of Jialing River as an example, the study area is divided into five subareas. Based on the ArcGIS software, the spatial distribution of built-up area and river bank in each subarea is extracted. The difference of urban expansion in comparison confirms three kinds of influence mechanisms. The results show that the bridge and road construction promote the rapid expansion of the built-up area in the study area, but have different effects on the expansion speed of the built-up areas in different sub-areas. The expansion of the third sub-area reflects the point-like radiation and linear extension of the bridge- Radiation, while the expansion of the fourth sub-city reflects the circular radiation of the bridge-road to urban expansion. The conclusion shows that the point-like radiation, linear radiation and annular radiation proposed by the research are in line with the impact mechanism of bridge-road construction on the expansion of mountainous cities in Southwest China.