| The current rapid development of cities,people enjoy the convenience of urban civilization at the same time,a "furnace" is constantly born.Summer temperatures in Xi’an,Chongqing,Nanning,Guangzhou and other cities can even exceed 40 degrees Celsius.Therefore,cooling the city has become an urgent problem for the community to solve.Studies have shown that increasing the greening area can effectively alleviate the urban heat island effect,but urban land is relatively tight,and it is difficult to implement large areas of greening on the urban ground.However,green roofs and vertical greening can alleviate the urban heat island effect on the basis of land saving.At present,most of the buildings in the city are high-rise buildings,and roof greening has problems such as difficult maintenance and small greening area,therefore,this paper starts the research on vertical greening.First of all,in chapter 2,taking Nanning city as an example,this paper investigates the public’s satisfaction with vertical greening,the necessity of promotion,and the status quo of social and ecological benefits.The research found that the wall greening technology still needs to be further improved and promoted.The green wall in the investigated area has little consideration for the functional requirements,no suitable irrigation and drainage system,and many plants and walls fall off.The design effect of wall greening is not ideal.The plant species selected are relatively narrow and the growth habits of plants are not fully considered.Some designers do not know enough about the thermal environment produced by green wall and its influence on microclimate.The technical elements of wall greening are the key link of promoting wall greening.According to the problems found in the investigation,the third chapter combs the technical characteristics of the wall greening,and analyzes from five aspects: the structure and structural technology of vertical greening,external influencing factors,the selection of plants and the key points of the wall greening design.In the fourth chapter,this paper introduces the principles and influencing factors of residential wall greening design,and introduces the architectural form of residential wall greening and the composition form of wall greening.In order to understand the popularity and promotion significance of green wall,due to the fact that different parts of the building wall are exposed to the sun for different hours,the local growth of vegetation is prone to be unhealthy,thus affecting the thermal benefit.Therefore,on the basis of the investigation in the previous chapter,in order to explore a better arrangement of wall vegetation and ecological benefits,a vegetation arrangement method based on wall sunshine hours is proposed in chapter 5.This paper firstly analyzes the sunshine on the wall,and then carries out three groups of tests.The first group is to choose the new vertical greening arrangement of plants,the second group is the traditional vertical greening arrangement,and the third group is the control group experiment.The results show that the arrangement method based on sunshine hours can effectively prolong the growth time of some vegetation,and has better thermal benefit than the traditional method.Then,with the help of microclimate simulation software ENVI-Met,the thermal benefits of this kind of planting method and vertical greening coverage on microclimate environment were simulated and explored.The results showed that vertical greening wall coverage was closely related to wall cooling and moisturizing.The higher the coverage,the more obvious the cooling effect at day and night.It also has a stronger moisturizing effect on the air around the outdoor environment.The promotion of wall greening technology can reduce urban heat island effect on the basis of land saving,improve the overall ecological environment of the city and regulate the microclimate of the living environment.The vertical greening design method based on light-sensitive performance proposed in the article is more suitable for vegetation growth than the traditional vertical greening design,and also has better microclimate thermal benefits.It provides a certain reference for the promotion and application of wall greening. |
