苏州城市不同类型用地碳排放特征及估算方法研究

发布时间：2018-01-01 03:24

本文关键词：苏州城市不同类型用地碳排放特征及估算方法研究　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,城市已成为全球碳排放的主要区域,城市碳排放对全球碳循环和气候变化产生了深远的影响。城市土地利用可以直接影响陆地生态系统与大气之间的碳循环过程,而由于城市人类活动剧烈导致碳排放的作用机理更加复杂,使得开展城市生态系统碳循环研究已成为全球气候变化研究中最复杂、最迫切的工作之一。因此,研究城市土地利用过程中碳排放具有重要的理论和现实意义。本文在国内外研究的基础上,结合城市用地分类及碳源类型,选取了城市住宅用地、教育科研用地和工业用地作为研究对象,分析了其碳源构成及二氧化碳浓度随时间变化特征,结果表明:城市不同类型用地的二氧化碳浓度日变化特征具有较好的时间规律性。其次,运用实验法和模拟法,设计了室内外二氧化碳排放实验,并基于FLUENT模拟了室内二氧化碳排放实验,结果表明:地表二氧化碳扩散受重力作用具有沉积性,受湍流作用具有随机性,而基于FLUENT的二氧化碳室内排放模拟与室内实验结果能够较好地吻合。再次,基于FLUENT室内模拟结果,采用数学模型法,建立并检验了城市土地利用碳排放量估算模型,结果显示:二氧化碳排放量的模型估算结果为41828mg,而实际的CO2排放量为49425mg,两者之间相差7597mg,约占实际排放量的15%,表明模型有一定的可靠性,具有较高的精度。最后,以星韵花园社区为例,运用实证研究法,分别基于模型和实地调研数据估算了社区2015年1月的二氧化碳排放量。结果显示:基于实地调研数据的社区日均二氧化碳排放量为436.12Kg,而模型估算的社区日均二氧化碳排放量为294.71Kg,约占实地调研结果的68%。
[Abstract]:At present, cities have become the major regions of global carbon emissions. Urban carbon emissions have a profound impact on the global carbon cycle and climate change. Urban land use can directly affect the carbon cycle between terrestrial ecosystems and the atmosphere. Because the mechanism of carbon emission is more complex due to the intense human activities in cities, the research on carbon cycle of urban ecosystem has become one of the most complex and urgent work in the study of global climate change. It is of great theoretical and practical significance to study carbon emissions in the process of urban land use. Based on the research at home and abroad, this paper selects urban residential land based on the classification of urban land and the types of carbon sources. The carbon source composition and carbon dioxide concentration of educational research land and industrial land were analyzed. The results show that the diurnal variation of carbon dioxide concentration in different types of land in cities has a good time regularity. Secondly, the indoor and outdoor carbon dioxide emission experiments are designed by means of experimental method and simulation method. The indoor carbon dioxide emission experiments are simulated based on FLUENT. The results show that the surface carbon dioxide diffusion is sedimentary by gravity and stochastic by turbulence. The results of indoor carbon dioxide emission simulation based on FLUENT are in good agreement with the results of indoor experiments. Thirdly, based on the results of FLUENT indoor simulation, the mathematical model method is adopted. A carbon emission estimation model for urban land use was established and tested. The results show that the carbon dioxide emission model is estimated to be 41828 mg, while the actual CO2 emission is 49425 mg. The difference between the two is 7597 mg, about 15% of the actual emissions, indicating that the model has a certain degree of reliability and high accuracy. Finally, taking the community of star rhyme garden as an example, the empirical research method is used. Community CO2 emissions in January 2015 were estimated based on the model and field survey data respectively. The results showed that the average daily carbon dioxide emissions of communities based on field survey data was 436.12kg. The model estimated that the average daily carbon dioxide emissions in the community were 294.71 kg, which accounted for 68% of the field survey results.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：F301.2;X321

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