Research On The Thermal Effect Of Industrial And Mining Land And The Heat Island Effect Of Mining Cities Under The Thermal Effect

The industrial structure of a city is closely related to the environmental problems faced by the city.Mining industry occupies an important position in my country's national economy,and the environmental degradation of mining cities is increasing.The urban heat island effect is an important indicator of the deterioration of the ecological environment in mining areas.As an important heat source and carbon source of mining cities,industrial and mining land has a great impact on the regional thermal environment pattern and local climate change.Studying the thermal environment of mining cities is the fundamental need and necessary process to solve regional climate change.This research takes Wu'an,a mining city,as the research area,and conducts a multi-scale detailed study on the temporal and spatial distribution characteristics of the heat island effect through universal single channel surface temperature inversion algorithm,GIS superposition and spatial analysis method,regression analysis method,mathematical model method,quantitative and qualitative analysis method and so on.Taking the industrial and mining land occupied by its leading industry as the research object and further classifing it into iron ore mining land,coal mining land,iron and steel smelting land and coal processing land.The influence of industrial and mining land on land surface temperature is analyzed on the municipal and regional scale.Analyze the relationship between various industrial and mining land landscape pattern characteristics and land surface temperature on the patch scale.Through the study of element correlation on a more micro-scale inside the patch,the simulation of the thermal radiation diffusion prediction model of industrial and mining land temperature is further realized.The above research provides theoretical and methodological references for industrial layout adjustment and land use planning in the process of urban transformation.The main research conclusions are as follows:(1)Based on the Google Earth Engine,the land surface temperature of Wu'an in the long time series from 2004 to 2018 is retrieved by universal single channel algorithm,and two indexes of heat island intensity and heat island area are extracted to quantitatively analyze the distribution characteristics of urban heat island effect in Wu'an on the time scale.The result is that the urban heat island effect of Wu'an shows an upward trend in terms of heat island area and heat island intensity.In terms of seasonality,only summer has obvious urban heat island effect in Wu'an,and the urban heat island effect at night is stronger than that during the day.In the spatial dimension,through the results of GIS superposition,spatial analysis and profile analysis,it is concluded that the urban heat island of Wu'an city is distributed in multiple centers,the heat island center corresponds to the central urban area and mining land intensive area respectively,and the industrial and mining land and residential land contribute the most to the urban heat island effect of Wu'an.(2)Based on the conclusions drawn in the previous part,in order to explore the effect of industrial and mining land on the heat island effect of mining cities on a municipal scale,a numerical response regression fitting is carried out between the heat island effect of mining cities and the geothermal effect of industrial and mining land,For the quantitative indicators of urban scale heat island effect,heat island area and heat island intensity,7 and 6 driving factors of industrial and mining land spatial distribution characteristics and environmental climate are selected for multiple linear regression fitting with high fitting degree.Among them,the correlation between heat island area and patch area and average wind speed affecting the objective temperature of industrial and mining land patches is stronger than that of other factors,while the correlation between heat island intensity index and patch aggregation degree,landscape fragmentation,patch fractal dimension,average wind speed and other factors affecting temperature aggregation is stronger(3)In order to further explore the impact mechanism of industrial and mining land on the thermal environment on the regional scale,on the premise of subdividing the industrial and mining land into four subcategories,the village scale is selected to analyze the correlation between the landscape configuration index of various industrial and mining land and its regional surface temperature.The results show that the regional surface temperature is affected by the characteristics of industrial and mining land distribution pattern.The impact of industrial and mining land on the land surface temperature of its area is positively correlated with the proportion index of patch in landscape area,PLAND,which reflects its scale,and the aggregation index,AI,which reflects its spatial layout.The AI index of four types of industrial and mining land has strong correlation with regional land surface temperature,while the correlation between land index of smelting(processing)land and regional land surface temperature is stronger than that of mining land.(4)Two patch attribute characteristic indexes,patch area and shape,patch internal average temperature and heating rate per unit area proposed are selected to quantitatively study the internal thermal effect of independent patches of various industrial and mining land from the patch scale by means of regression analysis,It is found that there is a strong correlation between the internal thermal effect of industrial and mining land and the attribute characteristics of the patch,and there is an inflection point.In the inflection point range,the internal surface temperature of industrial and mining land patch is positively correlated with patch area,the heating rate per unit area of patch is positively correlated with patch shape,and the inflection point characteristics of different industrial and mining land types are different.(5)By constructing the prediction model of geothermal radiation diffusion characteristics of industrial and mining land on patch scale,the law characteristics of external thermal effect of industrial and mining land are explored.Two thermal radiation indexes,thermal radiation intensity and thermal radiation distance,are used to quantitatively characterize the heat diffusion of industrial and mining land.For the two indicators,8 driving factors such as the proportion of impervious layer area in the patch and the distance from the thermal centroid in the three factor layers of surface coverage,patch shape and environmental climate,and 7 driving factors such as the proportion of impervious layer area in the patch and wind direction are determined respectively,and the regression simulation with high fitting degree is carried out.The test results show that the regression equation can better explain the relationship between industrial and mining geothermal radiation and driving factors.