| At present,many studies have proved that China and other developing countries around the world will continue to promote local urbanization process in the future.Therefore,large cities in relevant countries and regions are faced with the problem of increasing urban population and continuous expansion of urban scale.Because of increased the population of permanent residents in big cities and city proper scale continued expansion can lead to high strength of city underlying surface hard and city proper range widely used cars can produce a large amount of waste heat of modern transportation,such as the national and regional urban heat island effect in big cities and the urban public health risks are likely to continue to increase,And urban green space is at a lower cost significantly weaken the urban heat island effect,reduce the pressure for urban public health one of the means,therefore,how to develop urban heat island effect based on the prevention of future big cities sprawl deterioration and the city proper of urban green space system planning method,is the current urban green space system planning area should be fully focus on the important issues.Based on Landsat satellite remote sensing image data,hand-held meteorological data and land cover data of tianjin downtown urban land,this study takes tianjin downtown urban land(including central urban area,Xiqing,Aviation City,Eco-city,Jinnan,Binhai New Area,Dagang City and other urban areas)as the research area.Using the temperature data relationship model and markov cellular automata model,the urban heat island effect and land cover status of the study area in the future key years(2030 and 2040)were predicted respectively.On this basis,the suitability evaluation of urban green space system development land was carried out.Combined with the overall Urban Planning of Tianjin(2005-2020)and the status of important land features(roads,water bodies)in the central urban land area of Tianjin in 2020,the optimization strategy of urban green space system for central urban land of Tianjin is put forward.Findings of this study:(1)The central distribution of high intensity URBAN heat island patches(grade 3,4 and 5 URBAN heat island patches)within the central urban land area of Tianjin from 2020 to 2040 has no obvious migration;This indicates that the distribution pattern of urban heat island center will not change significantly.However,the high intensity UHI patches continued to expand outward from the patch center and eventually formed a large scale high intensity UHI patches,while the medium and low intensity UHI patches(grade 1 and 2 UHI patches)continued to evolve towards slope fragmentation.This phenomenon indicates that the intensity of urban heat island effect may continue to increase in the future.(2)Under natural evolution conditions,there will be no significant change in land cover status within the central urban area of Tianjin from2020 to 2040;However,due to the predicted continuous increase of unused land area,the possibility of urban built-up area expansion in the study area is still large.(3)In 2020,2030 and 2040,there is no significant change in the central distribution of land patches that are very suitable,suitable and basically suitable for urban green space development in tianjin.Among them,the most suitable and suitable land patches for urban green space are mainly concentrated in the areas along important roads,near important road junctions and around large scale reservoirs within the study area,and these patches have a trend of continuous expansion.The patch centers which are basically suitable for urban green space development are widely and evenly distributed within each district administrative unit in the study area,and most patches continue to expand,while some patches have a trend of fragmentation.(4)Based on the prediction and analysis of urban heat island effect,land cover and suitability of urban green space system development land for tianjin central city in the future,combined with the Overall Urban Planning of Tianjin(2005-2020)and the conditions of roads and water bodies within the land scope of Tianjin central city in 2020,Within the study area,112 node attribute elements(including 11 newly added firstlevel nodes,8 newly added second-level nodes,45 reconstructed green space nodes,and 48 reconstructed building nodes),4 circular green belts,multiple green corridors,and 11 large-scale wedge-shaped regional green space with complex boundaries were set.It has formed the urban green space system of "multi-point,multi-corridor,number wedge and four rings" in downtown Tianjin.The innovations of this study include:(1)In this study,the suitability evaluation of urban land development was carried out to guide the planning and design of the future urban green space system.Based on this system,a case study was carried out to verify the suitability evaluation of urban land development in typical mega-cities in northern Coastal areas of China.Relevant research results prove the possibility and necessity of this research practice.(2)This study attempts to combine urban heat island effect,urban land cover simulation and prediction with urban green space system planning practice.Relevant research results demonstrate that the urban heat island effect,urban land cover simulation and prediction results and urban green space system planning can greatly improve the efficiency of green space system planning,and verify the value of urban green space system planning and design based on cross-domain knowledge. |
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