Spatial pattern of anthropogenic heat flux in monocentric and polycentric cities: The case of Chengdu and Chongqing
Spatial pattern of anthropogenic heat flux in monocentric and polycentric cities: The case of Chengdu and Chongqing
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单中心和多中心城市人为热通量空间格局:以成都和重庆为例
DOI：
10.1016/j.scs.2021.103628
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发表时间：
2022-03-01
影响因子：
11.7
通讯作者：
Liu, Xue
中科院分区：
文献类型：
--
作者：
Ming, Yujia;Liu, Yong;Liu, Xue
虽然人类活动的热排放（AHE）已被公认为是对城市热环境的一个重大威胁，但人们很少关注不同城市形态下AHE强度的差异，即人为热通量（AHF）。因此，我们选择了中国的一个单中心城市（成都）和一个多中心城市（重庆）来比较AHF的空间格局。从建筑、交通、工业和人体新陈代谢四个方面计算整个城市的AHE，然后采用基于库存的方法分配到各个街区。结果表明，建筑热和交通热是造成城市空气热交换的主要原因。在成都，年平均AHF由市中心向郊区递减，形成一个环形和连续的格局。在重庆市，AHF主要集中在几个热点（次）中心，形成了一个均衡的聚集格局。来自建筑物和人体代谢的AHF是连续的，集中在城市中心。而交通和工业领域的AHF分布较为分散，与道路网络和工业格局相一致。研究结果表明，不同城市形态下，城市大气环流的空间格局存在差异，需要规划者考虑其差异性，制定相应的政策以缓解城市大气环流，实现城市的可持续发展。
Although anthropogenic heat emission (AHE) has been acknowledged as a significant threat to urban thermal environment, little attention has been paid to the differences in the intensity of AHE, namely anthropogenic heat flux (AHF), under distinct urban forms. Therefore, we chose one monocentric city (Chengdu) and one polycentric city (Chongqing) in China to compare the spatial pattern of AHF. AHE was calculated from four aspects of buildings, traffic, industries, and human metabolism for the whole cities and then allocated to the blocks using the inventory-based method. The results showed that building and traffic heat accounted for major AHE. In Chengdu, annual mean AHF decreased from the urban core to the suburbs, forming a circular and contiguous pattern. In Chongqing, AHF concentrated in several hotspots of the (sub)centers, resulting in a balanced and clustered pattern. AHF from buildings and human metabolism were contiguous and concentrated within city centers. In contrast, AHF from traffic and industries were scattered and dispersed in line with the road networks and industrial patterns. The results reflected that the spatial pattern of AHF varied with different urban forms, which called for planners to consider the differences and make related policies to mitigate AHF for urban sustainability.