Research On The Impact Of The Urbanization Process Of The Beijing-Tianjin-Hebei Urban Agglomeration On The Thermal Environment

Beijing Tianjin Hebei Urban agglomeration is an important economic cooperation area in the north of China,and will focus on building a world-class city area in the future.In the past 10 years,Beijing Tianjin Hebei Urban agglomeration has entered an unprecedented stage of rapid development,but the adverse effects of ecological environment problems and resources and energy problems on the urban environment are increasingly prominent.Among the many factors that affect the quality of the city's environment,the impact on urban thermal environment is particularly important.The impact of urbanization on the thermal environment has also been gradually taken seriously.In order to promote the cooperation and development of Beijing,Tianjin and Hebei,the study explores the impact of urbanization on the thermal environment in Beijing Tianjin Hebei Urban Agglomeration,puts forward mitigation measures and improves the quality of urban environment.Under the conditions of fully integrating land use data and socioeconomic data,the MODIS data of the three issue in 2005,2010 and 2015 are the basic data.The study takes remote sensing quantitative inversion and GIS spatial analysis as the technical support,uses research methods of correlation regression analysis,analyses the impact of urbanization on the thermal environment from the perspective of population,economy and land urbanization.The research content and conclusion can be divided into the following aspects:(1)Using GIS software to mask the corrected MODIS data,get surface temperature data of Beijing Tianjin Hebei Urban Agglomeration in 2005,2010 and 2015,and use density classification method.The result is the surface temperature of Beijing Tianjin Hebei Urban Agglomeration showed an overall upward trend in 2005-2015.And the area of low temperature and middle temperature has been decreasing,and the area of sub low temperature,sub high temperature and high temperature area has been increasing continuously.(2)The surface temperature data used in this paper are NASA MOD11A2 data products-the global 1km surface temperature / emissivity 8 days to synthesize L3 products,and thermal classification of the land surface temperature data is conducted by density classification,analyze the spatio-temporal pattern and change characteristics of thermal landscape in urban agglomeration.Secondly,we choose the heat island intensity(representing the urban suburban temperature difference)to analyze the urban heat island intensity from the interannual perspective,so as to reveal the temporal and spatial variation of the heat island effect.The study shows: the intensity of urban heat island in Beijing Tianjin Hebei Urban agglomeration was between 0.3?-1.45 ? in 2005.In the2005-2010 year,except Tianjin and Tangshan,the intensity of urban heat island in Beijing Tianjin Hebei Urban Agglomeration showed an overall upward trend.In the 2010-2015 years,the intensity of heat island in each city of Beijing Tianjin Hebei Urban Agglomeration decreased as a whole,especially in Shijiazhuang,Beijing and Zhangjiakou.(3)From the perspective of population urbanization,the correlation analysis method has been used to conclude that the number and increment of urban population,the amount of motor vehicle ownership and the completed area of the whole social housing have a significant positive relationship with the intensity of the heat island.Among them,the correlation coefficients of urban population and heat island intensity in 2005,2010 and2015 were 0.8735,0.8018 and 0.8333 respectively,and the correlation coefficient of population increment and urban heat island intensity was 0.7993,and the 0.01 significant test was passed.Secondly,the correlation coefficient between motor vehicle ownership and the completion area of the whole society and the urban heat island intensity in 2015 was0.7936 and 0.8442 respectively.From the perspective of economic urbanization,the correlation coefficients of GDP and energy consumption in 2015 were 0.6526 and 0.7183 respectively.(4)Based on the land use data in 2005,2010 and 2015,the built-up area boundaries of10 cities in three periods were extracted by visual interpretation.In this paper,the laws and morphological characteristics of urban land expansion in Beijing,Tianjin and Hebei Urban Agglomeration in the last 10 years are summarized,and the regression analysis method is used to select the built area in 2015 and the increment of the built-up area for2005-2015 years,and the correlation coefficient is 0.8336 and 0.7689 respectively.(5)In the 2005-2015 year,the built-up area of Beijing continued to expand outwards,with the East-West as the main axis,and the north and south sides extended as big cakes.Tianjin's urban expansion is also mainly spread to the surrounding area,lump development.The expansion of Tangshan City's cities and towns is mainly based on two way expansion,mainly concentrated in the North Fengrun district and the southern Fengnan District.The urban expansion of Chengde and Zhangjiakou is not obvious.The expansion and expansion of Baoding city is relatively slow.The change of urban expansion in Shijiazhuang is very obvious,basically forming "bird" shape distribution.The expansion of cities and towns in Cangzhou and Langfang is more regular,basically radiated by four weeks,and the development of the latter five years(2010-2015 years)is relatively faster than the first five years(2005-2010 years),and the expansion of Langfang cities and towns is the opposite.(6)The method of superposition analysis is used to analyze the correlation between the surface temperature and the underlying surface of the urban agglomeration of Beijing,Tianjin and Hebei.The urban land is the largest contribution to the high temperature area,and the contribution of the water body is the smallest.The difference between the urban land and the water body in 2005,2010 and 2015 is 4.43?,5.6? and 4.28?,respectively,and the total average temperature of the city group in Beijing,Tianjin and Hebei Province.The difference between the maximum temperature and the minimum temperature is 4.77 degrees.(7)According to the relationship between the three angles of the urbanization process of Beijing Tianjin Hebei Urban Agglomeration and the intensity of the heat island,the corresponding countermeasures are put forward from three aspects of reducing human heat,improving the city's underlying surface and planning the urban space layout rationally,providing favorable suggestions for the development of the later Beijing,Tianjin and Hebei Urban Agglomeration in order to promote the coordinated development of Beijing,Tianjin and Hebei.Exhibition.