Influence of urban form on the cooling effect of a small urban river
Influence of urban form on the cooling effect of a small urban river
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DOI：
10.1016/j.landurbplan.2018.10.022
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发表时间：
2019-03
影响因子：
9.1
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中科院分区：
文献类型：
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城市化加剧导致的城市变暖正在成为一个严重的环境问题，要求城市规划者考虑降低城市气温的减热战略。城市河流通过蒸发和传递感热，即河流冷却效应（RCE），在减少城市热量方面发挥着重要作用。为了确定夏季不同时段的河流冷却强度（RCI）与城市形态之间的关系，我们使用详细的现场测量方法计算了韩国首尔清溪江的河流冷却强度（RCI）和河流冷却距离（RCD）。结果表明，清溪江下午2点的平均RCI为0.46 °C，平均RCD为32.7 m；晚上10点的平均RCI为0.37 °C，平均RCD为37.2 m。RCE的空间变化与街道宽度和下午2点平均建筑高度呈负相关，表明街道越窄、建筑物越低，RCE越好。此外，RCE的时间变化与相似湿度条件下的风速变化有关。我们的研究结果表明，河流周边的城市形态会影响当地的RCE，这表明景观和城市规划者应该将城市形态视为影响城市热量和RCE的变量。
Urban warming due to increased urbanization is becoming a serious environmental problem, requiring urban planners to consider heat mitigation strategies that reduce urban air temperature. Urban rivers play an important role in reducing urban heat through evaporation and transfer of sensible heat, known as the river cooling effect (RCE). We used detailed field measurements to calculate the river cooling intensity (RCI) and river cooling distance (RCD) for the Cheonggye River in Seoul, Korea in order to determine the relationship between RCE and urban form at different times of day during summer. Our results showed that the Cheonggye River had a mean RCI of 0.46 °C and a mean RCD of 32.7 m at 2 p.m. and a mean RCI of 0.37 °C and a mean RCD of 37.2 m at 10 p.m. Spatial variations in RCE were negatively correlated with street width and mean building height at 2 p.m., indicating that narrower streets and lower buildings would improve the RCE. In addition, temporal variations in RCE were related to changes wind speed at similar humidity levels. Our results show that the urban form surrounding a river can affect the local RCE, suggesting that landscape and urban planners should consider urban form as a variable affecting urban heat and RCE.