Study On Spatial Pattern Of Urban Residential Cluster In Guanzhong Urban Agglomeration Based On The Distribution Of Suspended Particles

In recent years, with rapid urbanization and the rapid development of industry, the haze phenomena caused by atmospheric particulates, has become the main affect residents’ health and normal life of atmospheric pollution.Urban residential group is the most important cities in the urban built environment activities and outdoor space, the space form of micro climate change directly affects the diffusion degree of suspended particulate matter.In order to solve this problem, based on the urban residential group as the research object, research between monomer architecture and urban living group suspended particle distribution between the mesoscale level problem, for the following research.First research the xi ’an 88 neighborhood groups, micro climate and refining of the combination of group living space form index, the influence of abstracts for xi ’an group and the factors of physical model;Second, the in-situ test method was adopted for the xi ’an winter and summer group living space of wind speed, temperature, humidity and daily variation of PM2.5 concentration data, and micro climate factor is obtained by data analysis, the correlation of PM2.5 concentrations in live group design factors.Regression data for micro climate space form and the factors affecting the design factors on the impact of PM2.5 concentration distribution, and get the sort of micro climate is: > wind speed > temperature humidity, sort of design factors are as follows: the sky open degree > the rate > shape index > volume rate.And based on field research and theoretical research, and put forward a new index sky open degree and shape index.Third, the use of CFD simulation quantitative comparison of various design factors on the influence of the suspended particle concentration distribution, the simulation results as follows: the optimal sunshine coefficient 1.6 and 2.0;Adjacent buildings compared to the optimal scheme on building height 9(1:1) and 18 layers(2:1) is the optimal choice;The optimal direction projection Angle take 75 DHS, namely building towards to northwesterly 30 DHS, road and direction Angle to 15 DHS;The optimal rate is 35%, 40%;High-level group and the optimal volume rate is 2.0, and should not be more than 4.0;Multilayer group optimal volume rate is 1.5, and not more than 3.0;The shape coefficient of optimal take 0.238 or 0.249;The shape index of the optimal value for quadrilateral 262.89;The sky open degree of the optimal value 1 or 0.64;Living groups in the layout of the form, peripheral type group layout is the most unfavorable, determinants of the optimal.The paper through to the group of each index and spatial form the simulation results, summarizes its index and the correlation of suspended particulate matter, and will select the optimal scheme combined with relevant methods of planning and design, puts forward the function layout demands, planning layout to optimize the layout and form three aspects about the design of urban residential group strategy and threshold, the subjective qualitative theoretical basis for urban planning and design, provide more scientific and can conduct quantitative design parameters.For the first time by using the method of urban planning and architectural technology course cross, system and complete the spatial form of urban residential group’s influence on the suspended particle concentration distribution, is in the stage of the planning study, from the perspective of optimizing group space form, to provide scientific guidance to improve the suspended particle concentration distribution.