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Role of local climate zone and space syntax on land surface temperature (case study: Tehran)
Urban Climate ( IF 6.4 ) Pub Date : 2022-08-09 , DOI: 10.1016/j.uclim.2022.101245
Saeedeh Nasehi, Ahmadreza Yavari, Esmail Salehi, Rohinton Emmanuel

Land surface temperature (LST) is one of the key parameters in the physics of land surface processes from local through global scales. Although many definitions and classifications have been proposed to better understand the causes and evolution of LST, not enough attention has been paid to their relationship to factors such as socioeconomic characteristics and spatial configuration of cities and the fact that city-level temperatures may not exist. Aiming to elucidate the effects of these factors and their relation to surface temperature dynamics, this study explored the relationship between land surface temperature (LST) variations and (using the Local Climate Zone [LCZ] method) space syntax (using Open Street Map data), and other physical and non-physical (e.g., socioeconomic) factors (and their combined effects through the Analytic Hierarchy Process (AHP) method). In the next step, a map of socio-spatial segregation, comprising four urban zones, was created. The lowest and highest mean LST figures were related to “water body” and “bare soil or sand” LCZs. Among the four segregated zones in this study, the lowest mean LST was recorded in the integrated areas. The highest mean LST was observed in the absolute (involuntary) segregation zone. The results suggested that integrated areas have a lower standard deviation than those of other zones, indicating a more consistent or stable cooling effect. In addition, the varied composition of building heights could help to mitigate the urban heat island. Finally, some considerations were presented for local climate improvement in the urban spatial structure.



中文翻译:

当地气候区和空间句法对地表温度的作用(案例研究:德黑兰)

地表温度 (LST) 是从局部到全球尺度的地表过程物理学中的关键参数之一。尽管已经提出了许多定义和分类以更好地理解 LST 的原因和演变,但没有足够重视它们与城市的社会经济特征和空间配置等因素的关系,以及城市层面温度可能不存在的事实。为了阐明这些因素的影响及其与地表温度动态的关系,本研究探讨了地表温度 (LST) 变化与(使用当地气候区 [LCZ] 方法)空间句法(使用开放街道地图数据)之间的关系,以及其他物理的和非物理的(例如,社会经济)因素(及其通过层次分析法 (AHP) 方法产生的综合影响)。下一步,创建了一张包含四个城市区域的社会空间隔离地图。最低和最高的平均 LST 数字与“水体”和“裸土或沙子”LCZ 相关。在本研究的四个隔离区域中,综合区域记录的平均 LST 最低。在绝对(非自愿)隔离区观察到最高的平均 LST。结果表明,积分区域的标准偏差低于其他区域,表明冷却效果更一致或更稳定。此外,建筑高度的不同组成有助于缓解城市热岛效应。最后,提出了城市空间结构中局部气候改善的一些考虑。

更新日期:2022-08-11
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