Research On The Design Method Of Urban Slow Traffic System "Constant-holistical Shadowed Space" In Hot Summer Area

In the hot summer area of our country,the duration of summer is long and the high temperature is hot and humid,which greatly affects the thermal comfort of outdoor environment.Because of the dynamic and Limited space-time of outdoor shadow area,the utilization rate of outdoor space in the daytime is restricted.In the face of the general poor thermal environment and the demand for outdoor shadow in summer hot season,urban slow traffic space,as the outdoor space used by people for high frequency and long time,such as going out,leisure and so on,is also the material space carrier of urban slow traffic system,which should provide its users with a more spatiotemporal applicability and light and heat comfort outdoor space environment.Based on the analysis of the characteristics of urban slow traffic space and the shadow space demand of its users,this paper points out that in the hot summer area,the use groups of urban slow traffic space are mainly pedestrians and riders,and the use groups show the demand of space-time continuity and quality comfort for outdoor shadow space.On the basis of a full visit to all kinds of urban slow traffic spaces in Guangzhou,we find that there are some difficulties in the current situation,such as the relative lack of effective shadow,the lack of space-time continuity,and the lack of shadow depth.The main reasons for the correction are that the construction of shadow space,the confusion of plant planting and the lack of sunshade structures are not considered in the urban planning and design stage.In this paper,it is considered that the construction of a kind of "Constant-holistical shadow" space in a specific space and a specific period of time is an effective and green way to deal with the current situation of the outdoor environment of urban slow traffic space and improve its thermal comfort.The main influencing factors of its "Constant-holistical shadow" space are building structure(height,shape,layout,orientation),plant structure(shape,height under the branch)And planting methods)as well as the external environment(solar height angle and azimuth angle,cross-sectional width of urban roads,the direction of slow-moving space,and the slope and aspect in the terrain).During the construction,the basic principles should be the specific analysis of the type of slow traffic space in a specific city,the mutualsupplement and cooperation of each structure and the proper consideration of the sunshine demand in winter,so as to provide the outdoor space environment with continuous space,long time,diverse scale forms and comfortable quality for the slow traffic space in a city.On the basis of defining the goal and principle of constructing the space of "Constant-holistical shadow",through the simulation analysis of the influencing factors and the mechanism of "Constant-holistical shadowed space" by ecotect software,the mechanism of constructing the space of "Regularly Shadow " is summarized.From the point of view of urban planning and design,this paper puts forward the design intervention way of "constant total shadow" space of urban slow moving space in hot summer area,and details the "Constant-holistical shadow" space construction design method of all kinds of slow moving space in hot summer area,which provides theoretical supplement and design guidance for its outdoor space optimization design.