Study On The Influence Of Anthropogenic Heat Removal On Urban Microclimate And Its Improvement Strategy In The Main Urban Area Of Wuhan

China is now in the stage of rapid development.Wuhan,as the top 10 city of GDP in China,has made rapid progress in urbanization.On the one hand,this situation is dramatically changing the attributes of urban underlying surface and urban morphological characteristics,thus affecting the regional land and air processes,which are important factors leading to urban heat island and urban high temperature;on the other hand,as the concentration of human beings,high-intensity and high-density human activities in cities will lead to a large number of human heat release in different types of regions,which will aggravate the urbanization The change of urban microclimate will also make the trend of urban high temperature more and more obvious,and the problem of urban heat island effect is becoming more and more serious.This paper summarizes and estimates the emissions of different types of anthropogenic heat,and analyzes the impact of different types of anthropogenic heat and its changes on urban microclimate,which has important scientific value to explore the urban land air process,thermal environment and the improvement of urban living quality.This study focuses on the impact of Urban Anthropogenic Heat Removal on urban microclimate.Firstly,the rationality and accuracy of WRF / UCM model are verified.Secondly,based on the top-down energy inventory method and the latest statistical data of Wuhan statistical yearbook,taking 2015 as the research object year,three types of anthropogenic heat(industrial production,road traffic and residents' life)which have a large impact on urban microclimate are estimated respectively,and a more perfect set of estimation methods for anthropogenic heat emissions in the main urban area of Wuhan city is given Combined with GIS technology,based on the regional gross industrial product,population,GDP,etc.,the spatial distribution of three kinds of anthropogenic heat sources in the region under the condition of high resolution and the variation law of different time are given,which can be used as the anthropogenic heat parameter input of the mesoscale meteorological model WRF / UCM.On this basis,WRF / UCM was used to analyze the impact of different types of anthropogenic heat and its changes on urban microclimate under the condition of keeping the land use scope and intensity unchanged.The results show that:(1)The influence areas of different types of anthropogenic heat on urban microclimate are different,and the effect is different.The industrial heat removal area is mainly type I construction land,and the residential heat removal area is mainly type II and type III construction land;(2)With the increase of anthropogenic heat emission,the variation range of meteorological factors such as air temperature at 2 m height and wind speed at 10 m height is quite different between daytime and nighttime,and the growth trend of thermal and dynamic characteristics is also different.The effect of night is more obvious,while that of daytime is smaller,which is closely related to solar radiation and anthropogenic heat emission type,heat emission and its diurnal variation;(3)In terms of heat island intensity,the urban heat island effect will be significantly enhanced whether the individual consideration of different types of anthropogenic heat removal(industrial production,residents' life,road traffic)or the consideration of the superposition effect of anthropogenic heat removal,and the cumulative consideration of the total anthropogenic heat removal;(4)There are some differences in the size,scope and effect of different types of anthropogenic heat removal on heat island effect at different time points,which is related to the differences in the diurnal variation of different types of anthropogenic heat removal.On the other hand,when only the same type of anthropogenic heat is considered,the intensity of heat island increases significantly with the increase of anthropogenic heat.In the overall trend of one day,the intensity of heat island shows a U-shaped trend of "low in the daytime and high at night".Finally,based on the anthropogenic heat estimation method summarized in the previous paper,according to the variation trend of different types of anthropogenic heat emissions from 2005 to 2017,the anthropogenic heat emissions in the main urban area of Wuhan in 2035 are predicted in the future.On this basis,the mesoscale meteorological model WRF coupled with UCM is used to simulate and set up different scenarios,and the scenarios under several models of Wuhan in the future are simulated Based on the simulation results,the urban microclimate regulation strategies are put forward:(1)control the amount of industrial land in the main urban area of the city,combined with the strategy of "retreat from the second to the third" in the process of urban renewal and industrial transformation of Wuhan;(2)control the number of fuel vehicles in the area Or try to promote new energy vehicles,such as electric vehicles and hybrid oil and electricity vehicles,to reduce road traffic heat emission,at the same time help to reduce carbon emissions,achieve carbon peak and carbon neutralization;(3)At the same time,we should optimize the structure of the building itself and change the behavior of some residents to reduce the heat emission;(4)appropriately reduce the construction intensity of the central area,reduce the total amount of man-made heat emission,etc.