基于凸壳原理的杭州城市扩展形态演化分析

发布时间：2018-08-28 08:18

【摘要】：在城市化快速推进的背景下,探索凸壳原理在城市扩展形态识别中的应用价值,并借此分析杭州市主城区1985~2010年间城市扩展形态演化规律及其机理,以期为控制城市扩展形态,指导未来城市土地开发活动提供借鉴。研究发现,凸壳原理在城市扩展形态识别上简单而明确,通过确定已有城市建设用地的凸壳,将城市所有可开发用地明确区分为凸壳内用地和凸壳外用地2类,为采取差别化的空间管理政策提供依据。构建了基于凸壳原理的城市扩展形态计算机识别方法,有利于在城市扩展模拟中实现城市扩展形态影响因素的定量化表达。1996年之前,杭州市建设用地和凸壳面积增长缓慢,城市形态相对紧凑;1996年之后,建设用地快速增长,城市不均衡扩展加剧,凸壳面积陡增,城市形态紧凑程度下降。总体来看杭州市城市扩展类型属于外延型,随着凸壳面积的增加,城市填充潜力随之增强,为促进杭州市城市紧凑化发展,应该严格控制凸壳外的城市土地开发。沿主干道的城市开发是城市形态外延式发展的主要因素,已有建设用地周边以及城市内部次要道路沿线的城市开发,以及城市中心的集聚作用和规划对城市开发的控制是城市形态填充式发展的主要因素,而郊区化发展和"东扩西进"等城市空间发展政策促使特定时期城市外延式发展。
[Abstract]:Under the background of rapid development of urbanization, this paper explores the application value of convex shell principle in the identification of urban expansion form, and analyses the evolution law and mechanism of urban expansion form in Hangzhou main urban area from 1985 to 2010, in order to control the urban expansion form. Guide future urban land development activities to provide reference. It is found that the convex shell principle is simple and clear in the identification of urban expansion morphology. By determining the convex shell of the existing urban construction land, all exploitable land in the city can be clearly divided into two categories: the convex shell land and the convex shell external land. For the adoption of differential space management policy to provide the basis. A computer recognition method of urban expansion morphology based on convex hull principle is constructed, which is helpful to realize the quantitative expression of the influencing factors of urban expansion form in urban expansion simulation. Before 1996, the construction land and convex shell area in Hangzhou City increased slowly. The urban form is relatively compact; after 1996, the construction land increases rapidly, the urban uneven expansion intensifies, the convex shell area increases sharply, and the compact degree of urban form decreases. In general, the urban expansion type of Hangzhou belongs to the extension type. With the increase of the convex shell area, the potential of urban filling increases. In order to promote the compact development of Hangzhou city, the urban land development outside the convex shell should be strictly controlled. The urban development along the main road is the main factor of the extension development of the urban form. The urban development along the periphery of the construction land and the secondary roads within the city has been carried out. The agglomeration function of urban center and the control of urban development by planning are the main factors of the filling development of urban form, while the policies of urban spatial development such as suburbanization development and "eastward expansion and westward advance" promote the urban epitaxial development in a specific period.
【作者单位】：浙江农林大学环境与资源学院;浙江大学公共管理学院;
【基金】：浙江省自然科学基金项目(LQ13D010003) 国家自然科学基金项目(51508513;41201563) 科研启动基金项目(2013FR057) 省高校访问学者专业发展项目(FX2013056)资助
【分类号】：TU984.113

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