Impact of urbanization-related land use land cover changes and urban morphology changes on the urban heat island phenomenon.
Impact of urbanization-related land use land cover changes and urban morphology changes on the urban heat island phenomenon.
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DOI：
10.1016/j.scitotenv.2018.04.091
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Xuefan Zhou;H. Chen
中科院分区：
文献类型：
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作者：
Xuefan Zhou;H. Chen
城市化引起的城市增长和发展影响着城市热岛现象。随着城市化的快速发展，我国各大城市面临着越来越严重的气候变化问题，尤其是城市热岛现象。紧凑型城市的合理规划和城市设计可以改善街道峡谷的通风，改变城市冠层的热平衡，从而减轻城市热岛现象。本研究的目的是评估和讨论不同类型的土地利用和土地覆盖（LUCC），以及不同的发展模式的紧凑型城市的城市热岛效应的缓解。为此，我们应用天气研究和预报模式（WRF）与城市冠层模式（WRF/UCM）在这项研究中。为评价LUCC变化对城市热岛的影响，以武汉市1965年和2008年的土地利用和土地覆盖统计数据为基础，选取2个案例进行研究。同时，为了评价城市形态变化对城市热岛的影响，设计了2种不同城市发展模式的假设案例，即高层案例和高密度案例，模拟城市形态变化对城市热岛的影响。研究结果表明，在1965年和2008年不同的LUCC下，武汉市城市热岛强度平均增加0.2 °C ~ 0.4 °C。此外，案例1965的缓解城市热岛效应的临界风速远低于案例2008。在不同城市形态下，由于高层建筑的遮阳效应，高层建筑的行人水平的城市热岛强度可能较低。然而，高层建筑的临界风速值比高密度情况下的临界风速值大1.5 ~ 2倍，说明武汉市高层建筑缓解城市热岛效应的可能性很小。
Urban growth and development caused by urbanization influence the urban heat island (UHI) phenomenon. With the rapid development of urbanization, China's major cities are facing more serious climate change problems, especially the UHI phenomenon. Proper planning and urban design of compact cities may improve the ventilation of street canyons and change the heat balance in the urban canopy and thus mitigate the UHI phenomenon. The aim of this study is to evaluate and discuss the mitigation of UHI with different types of land-use and land-cover (LUCC), as well as different development patterns for compact cities. To this end, we applied the weather research and forecasting model (WRF) with urban canopy model (WRF/UCM) in this study. To evaluate the impact of LUCC changes on the UHI, we set 2 cases based on land use and land cover statistical data from 1965 and 2008 of Wuhan. Also, to evaluate the impact of urban morphology changes on the UHI, we designed 2 hypothetical cases based on 2 different urban developing patterns, one is high rise case and another is high density case, to simulate the impact of urban morphology on the UHI. As for the results of this study, with different LUCC of 1965 and 2008, UHI intensity of Wuhan increased by 0.2 °C–0.4 °C in average. Moreover, the critical wind speed which can mitigate UHI of case 1965 is much lower than case 2008. With different urban morphology, the high-rise case may lead to lower UHI intensity at the pedestrian level due to the shading effects of high-rise buildings. However, the critical value of wind speed in the high-rise case was almost 1.5–2 times greater than that of the high-density case, which illustrates the reduced possibility of mitigating the UHI phenomenon for high-rise buildings in Wuhan City.