A Study On Urban Spatial Morphology Planning From A Low Carbon Perspective

Since the 21 st century,the rapid economic development of various countries has brought great environmental crisis-climate warming and global carbon emission crisis.In order to effectively deal with global warming,the construction of low-carbon cities has become the consensus of countries to achieve urban transformation,and the construction of low-carbon city spatial form is the basis of realizing low-carbon cities.At present,there is a lack of research on the spatial form of low-carbon cities in China.Even though some studies apply the spatial planning theory to the construction of low-carbon cities,most of the studies remain in the qualitative level.There is no in-depth research and discussion at the quantitative level.This paper focuses on Mianyang,the only science and technology city in China.For example,a quantitative study on the spatial form of low-carbon cities in Mianyang was carried out in order to provide an optimal path for the development of low-carbon cities in Mianyang.According to compact city theory,carbon emission and urban spatial form,urban carbon emission and urban land use,urban land use and urban spatial form,the framework of carbon emission-urban land-urban spatial morphology is constructed.Establish the carbon emission measurement model;Put forward the low-carbon urban spatial form development model.The carbon emissions of Mianyang city in various fields are measured and analyzed.The carbon emissions and carbon absorption of urban construction,industry,transportation and green space in Mianyang from 2010 to 2017 are calculated respectively.The Spss software is used to predict the construction and industrial fields of Mianyang in 2020.Carbon emissions in transportation and carbon absorption in green space are analyzed.In terms of carbon emission composition of Mianyang city,the carbon dioxide emission of Mianyang construction field from 2010 to 2020 is the largest,followed by industry field,transportation field;in the construction field,transportation field carbon emissions show an increasing trend year by year.In addition,the carbon emission in the industrial field decreased,and the carbon absorption in urban green space increased year by year.In terms of the level of urban low-carbon development,the average carbon emissions of Mianyang urban land in2010-2017 and 2020 are higher than that of the same kind of urban land in China.The average carbon emissions per capita and GDP are lower than those of similar cities in China,and there is a certain gap between the intensity of carbon emissions in Mianyang city and the average level of similar cities in China.Based on the measurement results of carbon emissions in different fields of Mianyang city,the influence mechanism of low-carbon city spatial morphology in Mianyang is analyzed.Firstly,this paper analyzes the influence of Mianyang urban construction land,industrial land,traffic land and urban green space on Mianyang low-carbon city spatial form,and then according to the overall urban construction situation,This paper summarizes the problems facing the development of low-carbon urban space in Mianyang.From 2010 to 2020,the carbon dioxide in the construction field of Mianyang increased with the expansion of construction land,and the carbon dioxide emission in the industrial field decreased with the expansion of industrial land.The carbon emission in the transportation field increases with the expansion of the transportation land,and the carbon sink capacity of the city increases with the green.The expansion of the ground area strengthens.From 2010 to 2020,the total carbon emissions of Mianyang city increased with the urban land expansion.According to the planning requirements,since 2010,the central urban area of Mianyang has mainly developed in a multi-central and organized way,with the lack of convenient public transport links among the groups,and the effective mixing of urban land within the groups has not been achieved.There is no green building cover in the urban area,the superior physical and geographical conditions of the city are not fully utilized,the urban green space is scattered in the city interior,and the occupation and housing of the city are unbalanced and so on.Encourage residents to travel more tend to mobile travel,greatly increase the carbon dioxide emissions of Mianyang city,resulting in urban High-carbon development is not conducive to the formation of low-carbon urban space in Mianyang.Combined with the concept of low-carbon,proposed Mianyang low-carbon urban space shape optimization path.According to the theory of carbon-oxygen balance,Mianyang belongs to the spatial standard of high-carbon cities from 2010 to 2017,and the urban center of Mianyang is still a medium-carbon city by 2020.On this basis,the paper further puts forward the way to optimize the spatial form of low-carbon cities in Mianyang,including adhering to the correct guidance of the overall urban planning,building a low-carbon transportation system,optimizing the existing industrial structure,and implementing green building coverage.Optimize the layout form of green space,promote the effective mixing of urban land use and so on.