| With the rapid development of urbanization,a large part of the world's population has migrated from rural to urban areas.The rapid increase in population has led to an increase in various problems such as urban climate change,especially the heat island effect is becoming more and more significant,the thermal environment in which people live is deteriorating.Therefore,exploring strategies to improve urban thermal comfort is critical to the public health of urban residents.The campus is an important place for college students to study in daily life and the landscape is diverse,and it is equivalent to the concentration of the city.The influence of factors such as landscape configuration and architectural layout on the thermal comfort of the school will also have certain reference significance for urban construction.This paper combines the methods of actual measurement and numerical simulation,the combination of qualitative description and quantitative research,and the combination of field research and partial scenario design.The ENVI-met model is used to simulate the spatial and temporal dynamic distribution of thermal comfort under different landscape features and architectural layouts in different groups.This article analyzes the effects of meteorological conditions and landscape features such as underlying surface type and sky view factor on thermal comfort.A thermal comfort spatial adaptation strategy is proposed,focusing on the path exploration,and providing the walking path under the thermal comfort angle of different time periods.The results of the study are as follows:(1)Through the establishment of weather stations in different groups to obtain summer field measurement data,using ENVI-met to simulate the PMV thermal comfort index,it was found that different groups exhibited strong thermal comfort heterogeneity at different time periods.From 10:00 to 13:00 in the teaching area,the proportion of the area with a PMV value greater than 3 gradually increased from 41% to 67%.From 13:00 to 16:00,the proportion of the PMV value greater than 3 gradually decreased from 67%.to 49%.At 19 o'clock,the entire study area was in a state of "warm" feeling,and the PMV value dropped to less than 2.(2)By using numerical simulation methods,it is found that factors such as air temperature and relative humidity,vegetation type,vegetation layout,and building layout are the key factors affecting outdoor thermal comfort of pedestrians.The wind speed contributes less to the improvement of thermal comfort due to the small difference between the study period and the study area.Among the characteristics of the underlying surface of the earth's surface,the green space in the teaching area is characterized by a cooling effect during the day and a heat island effect at night.Sky view factor is the key factor affecting thermal comfort.In the same underlying surface type,the outdoor thermal comfort difference of different sky view factor characteristics is up to 1.2,which is different by one level.Buildings adopt a determinant layout that further enhances thermal comfort.(3)From the aspects of changing the shape and layout of the building and simulating the green landscape design,strategies for mitigating and adapting to thermal comfort are proposed.Focusing on the PMV distribution map of numerical simulation results,the walking path between several buildings with high pedestrian use frequency at different time points in the study area and the residential area was studied.When there is green space during the day,try to walk through the green space as much as possible.Pedestrians' PMV values sometimes differ by one level,which is the difference between the "hotter" feeling and the "hot" feeling.But at different points in time,the path is not the same.Pedestrian walking needs to be combined with time points. |
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