| The intensive and efficient use of current land has become the main development direction of urban construction in China.The development mode of urban development from extensive to intensive and connotative,and finally the construction of compact spatial form is the only way for the development of urban space at this stage.The Qimen County is greatly affected by the topography and geomorphology of the mountain,and the construction land is fragmented.In addition,the lack of intensive development and construction has led to the current spatial boundary collapse,loose spatial structure and spatial disorder expansion of the Qimen County.Therefore,the paper takes the mountain town of Qimen County as an example to quantitatively explore its spatial form.First of all,the paper defines the basic concepts of compact cities and spatial forms.At the same time,it combs the compact city related theory and spatial morphology measurement methods and summarizes the research results of spatial morphology at home and abroad in recent years.Secondly,starting from the boundary of the external space form of the county town and the structure and land layout in the internal space form,quantitative analysis of the current spatial characteristics and existing problems,and optimization of the spatial shape of the county by the problem.In the process of external space shape optimization,the GIS platform and AHP analytic hierarchy process are used to construct land suitability evaluation,and the maximum expansion boundary of the county outer space is obtained,that is,the urban growth boundary.In this range,the GIS platform reclassification is used to simulate the different spatial expansion boundaries of Qimen County.The comparison of different fractal plans by grid fractal dimension shows that the boundary value of the evaluation value section is 3.2-3.4,which is 1.5256.The closest compact urban space form expectation value of 1.71 is determined to be the compact boundary of the outer space of the Qimen County.Compared with the 2017 space boundary fractal dimension value(1.219),the compactness is improved.Thirdly,the optimization of internal spatial form mainly summarizes the research results of spatial structure types of mountain towns,and assumes that the development of spatial structure of Qimen County is the development of single center centripetal development and strip extension development and multi-center group development.According to the fractal dimension,it is found that the fractal dimension of the spatialstructure of multi-center cluster development is 1.437,which is closer to the ideal value of compact form,so it is more suitable as the development direction of the current spatial structure of Qimen County.The spatial structure of the current situation is optimized under the development of the spatial structure of the multi-center group.The spatial syntax is used to compare the optimized scheme with the Qimen 2009 overall plan.The results show that the global integration,local integration and coordination are both It has risen and the space is closer.In the layout of land use,it is mainly to compare with the allocation indicators of small towns at home and abroad,and then adjust the main five types of land allocation indicators in the overall plan of the previous edition,and increase the ratio of residential,public service and green space to square land,and reduce commercial and industrial warehousing and The proportion of land used for roads makes the allocation of land use in the county more reasonable.Finally,the paper summarizes the optimization path of the spatial form of the Qimen County from three aspects: external boundary,spatial structure and land use layout,and proposes relevant optimization suggestions for the spatial form to try to guide the development of the Qimen County to a compact urban spatial form. |
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