Chronological Transition of Relationship between Intracity Lifecycle Transport Energy Efficiency and Population Density
Chronological Transition of Relationship between Intracity Lifecycle Transport Energy Efficiency and Population Density
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DOI：
10.3390/en13082094
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发表时间：
2020-04
期刊：
影响因子：
3.2
通讯作者：
Shoki Kosai;Muku Yuasa;E. Yamasue
中科院分区：
文献类型：
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作者：
Shoki Kosai;Muku Yuasa;E. Yamasue
作为一个研究课题，评估城市交通生命周期能源使用的兴趣一直在增长。各种研究评估了城市内交通能源使用与人口密度之间的关系，并普遍认为其负相关。然而，单个城市的历时转变尚未得到充分分析。因此，本研究采用广泛用于评估交通能源效率的交通能源强度，考虑生命周期能耗，获得了步行、自行车、汽车（传统汽车、电动汽车、混合动力汽车和燃料电池汽车）、公交车和电动火车等每种交通方式的交通能源强度。然后，计算了1987-2015年日本38个城市的城市内生命周期交通能源强度，假设城市内交通能源效率历时转变的原因是交通方式转变和电力结构变化。因此，日本城市人口密度较高与城内交通能源强度较低有关。其回归线的负斜率随着时间的推移而增加，因为人口密度较低的城市的城市生命周期交通能源强度不断增加，而人口密度没有发生显着变化。最后，本研究讨论了特别是在偏远地区提高城内生命周期交通能源效率的战略意义。
Interests in evaluating lifecycle energy use in urban transport have been growing as a research topic. Various studies have evaluated the relationship between the intracity transport energy use and population density and commonly identified its negative correlation. However, a diachronic transition in an individual city has yet to be fully analyzed. As such, this study employed transport energy intensity widely used for evaluating transport energy efficiency and obtained the transport energy intensity for each transportation means including walk, bicycle, automobile (conventional vehicles, electric vehicles, hybrid vehicles, and fuel cell vehicles), bus and electric train by considering the lifecycle energy consumption. Then, the intracity lifecycle transport energy intensity of 38 cities in Japan in 1987–2015 was computed, assuming that the cause of diachronic transition of intracity transport energy efficiency is the modal shifting and electricity mix change. As a result, the greater level of population density was associated with the lower intracity transport energy intensity in Japanese cities. The negative slope of its regression line increased over time since the intracity lifecycle transport energy intensity in cities with low population density continuously increased without any significant change of population density. Finally, this study discussed the strategic implications particularly in regional areas to improve the intracity lifecycle transport energy efficiency.