Research On Roughness Of High-density Urban Residential Area Based On GIS

With the acceleration of urbanization in China and the improvement of people's living standards,the spatial environment of high-density urban residential area has received more and more attention.As an important part of the city,the spatial shape of urban residential area has a great impact on environmental factors such as wind and heat in urban areas.Roughness is one of the important indicators for assessing the ventilation environment of urban underlays on a macro scale.Introducing it into urban residential area with smaller scales and calculating it in combination with spatial space design indicators,can further enrich the research content of roughness of the urban underlays,perfect the reference standards of urban settlement planning and design,and make the construction of urban residential area more scientific and rational under the background of new urbanization.The paper summarizes the important position of roughness in wind environment research by reviewing the research of GIS technology in architecture related fields,the research of urban residential space morphology and the research of roughness,and affirming the GIS technology in Potential in the study of the relationship between urban spatial form and roughness.At the same time,by analyzing the deficiencies in the research on the roughness of urban residential areas and other meso-and micro-scale spaces in China,it is found that the macro-evaluation indexes of urban wind environment such as roughness are weakly related to the design indexes of residential space morphology,resulting in the imperfection of the ecological evaluation and design standard system of urban residential areas.By combing roughness measurement and analysis methods,the author puts forward the research idea of??constructing high-density urban residential area roughness measurement model based on GIS.On this basis,Zhengwu district of Hefei city is selected as the research area,and three residential spatial morphology indexes,volume ratio,architectural form and layout mode,are used as roughness influencing factors for analysis.Finally,the paper calculates the roughness and interpolates the spatial distribution characteristics of the residential areas in the whole region,and makes data statistics and analysis on the calculated results and the three spatial morphological indexes of the sample residential areas.It was found that the distribution characteristics of the roughness of the residential area within the administrative area have a certain relationship with the surrounding environment,economy,transportation and other conditions of the residential area;in the correlation analysis,the Floor Area Ratio of the residential area has a significant positive correlation with the roughness,and the correlation coefficient R = 0.852,the fitting equation between the two variables is y = 1.79-4.69 x + 3.57x2-0.41 x3,indicating that within a certain range,as the volume ratio increases,the roughness value of the residential area will also increase,the obstruction effect of urban ventilation will also increase;the correlation coefficient and fitting equation of residential building form and layout are similar,and the correlation coefficient is small,showing only a low positive correlation with roughness,which indicates that the roughness of residential area is likely to increase with the increase of the proportion of slab building monomer and the proportion of group size in determinant layout.At the end of the paper,it is proposed that in cities with a relatively large urban residential area size,the establishment of a combination of control indicators for the spatial form of urban residential area based on roughness will help optimize the urban ventilation environment,protect the physical and mental health of the citizens,and also build harmony The society makes certain contributions.Figure[43] table[3] reference[66]...