摘要
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 urban space expansion is garnering an increasing attention from scientists. The construction of bridges and roads is important for traffic development in cities. However, the studies on the influencing mechanism of the bridge-road construction on the growth of mountain city are still limited. This study proposed three influence patterns—dotted, linear, and annular radiations—based on the impact of bridge-road construction on the location of urban developing area. We chose the northern bank of the Jialing River as the study area and investigated the influence of the construction of the Jialing River Bridge and the Huanghuayuan Bridge in Chongqing in the study area. We divided the study area into five sections, analyzed the spatial relationship between the urban area and the river bank for each section using Arc GIS, and tested the three mechanism patterns with the characteristics of the urban growth of the five sections in1940-2009. The results showed that the urban area proportion was small and the urban expansion was slow when no bridges exited in the study area. The construction of bridges and roads accelerated the urban expansion in the study area,while the influences were different in different sections. Moreover, the bridge-road construction shifted the urban expansion center from the fifth section to the third section. The urban expansion in the third sections indicated that the influences of bridge-road construction in the form of dotted and linear radiations, and the urban expansion in the fourth section reflected the influences of bridge-road construction in the form of annular radiation. The results indicated that the proposed dotted,linear, and annular radiations provide reasonable explanations of the influence mechanisms of bridge-road construction on urban expansion in mountain cities in Southwest China.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2017年第1期47-54,共8页
Resources and Environment in the Yangtze Basin
基金
中国博士后基金项目(2015M582526)
重庆市国土房管局科技项目(KJ-2015004)
国家自然科学基金项目(413713514)~~
关键词
山地城市
桥梁-道路
城市扩展
重庆市
Mountainous City
Bridges-road
Urban expansion
Chongqing City
