Study On The Wind Environment Of Villages And Towns Along The Hanjiang River And Sichuan Road In Southern Shaanxi

In the context of rural revitalization,the development of villages and towns has become the focus of national attention.The streets and alleys of villages and towns are not only the indispensable space for people's outdoor activities,but also directly affect the outdoor wind environment of villages and towns.The influence of street space wind environment on the indoor and outdoor thermal comfort of villages and towns has gradually become a concern.Due to the lack of reasonable planning for the space wind environment of villages and towns,the quality of street wind environment in winter and summer is difficult to meet the requirements of human settlements.It is urgent to study the space wind environment of villages and towns through scientific and effective methods,and put forward appropriate optimization strategies.Based on the field investigation and summary,this paper makes a detailed summary and analysis of the selected four key villages and towns in the Hanjiang river channel region of Southern Shaanxi,and summarizes the meteorological data of the region in the past 30 years and nearly three years.It is determined that the dominant wind direction of the region in winter is westerly with a wind speed of 3.64m/s,and the dominant wind direction in summer is easterly with a wind speed of 2.87m/s;By means of field test and statistical analysis,it is found that more than 80% of the measured wind speed is less than 1m/s in summer outdoor wind environment in this area.The unreasonable setting of Street entrance in windward direction of Chuandao village in Hanjiang River in southern Shaanxi in winter and summer,narrow street space and excessive building density lead to slow winter monsoon speed,Although it does not affect the thermal comfort feeling in winter,the appearance of vortex and wind shadow area makes the pollutant deposition in the streets and alleys serious.In summer,the air can not enter into the streets and alleys smoothly because of blocking,resulting in the hot air can not be effectively discharged,the muggy feeling is strong,and the wind environment is poor;According to the summary of relevant literature,the requirements of outdoor wind environment assessment for Hanjiang river channel area in winter and summer are put forward;Based on the numerical simulation method of computational fluid dynamics,this paper simulates and evaluates the wind environment characteristics of pedestrian height in the general layout of streets and alleys based on the characteristics of streets and alleys in Hanjiang Chuandao area,and puts forward the appropriate values of building density,building height and street width on the scale of streets and alleys.From the aspect of street and lane layout,the paper puts forward the construction of ventilation corridor,puts forward the method of reasonable layout of public space for the form of street and lane,and gives reasonable values for the scale of street and lane.It is suggested that the building density in this area should be less than 36%;The building height should be less than 15m;When the streets are open to traffic in this area,the width should be 6?11m,and 3?6m when only pedestrians pass.Finally,the reasonable analysis of Street building interface and street greening is carried out,and the optimization strategy is put forward.In order to provide a theoretical basis for the improvement of the spatial wind environment of villages and towns in the area of Hanjiang River Chuandao with quantitative and qualitative data analysis,and provide technical guidance for the reconstruction and new construction of villages and towns.