城市冠层粗糙度对暴雨云团运动和降雨落区的影响

邢月; 刘家辉; 倪广恒

doi:10.16511/j.cnki.qhdxxb.2020.22.011

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清华大学学报（自然科学版） ›› 2020, Vol. 60 ›› Issue (10) : 845-854. DOI: 10.16511/j.cnki.qhdxxb.2020.22.011

水利水电工程

城市冠层粗糙度对暴雨云团运动和降雨落区的影响

邢月, 刘家辉, 倪广恒

作者信息 +

Impacts of urban canopy roughness on storm evolution and rainfall area

XING Yue, LIU Jiahui, NI Guangheng

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文章历史 +

摘要

城市下垫面因其特殊的动力学和热力学特性，会对降雨产生影响。该研究以雄安新区为例，利用中尺度气象模式（WRF）对2016年7月20日的大规模暴雨事件进行模拟，采用不同城市冠层粗糙度方案设置，研究城市冠层粗糙度对暴雨云团运动和降雨落区的影响。结果表明，城市冠层粗糙度对暴雨云团的运动和降雨落区有显著影响：当城市冠层粗糙度较小时，云团经过城市时被加热，产生水汽辐合和雨岛效应，从而增加城区和下风向的降雨；当城市冠层粗糙度较大时，云团在城市上风向停留，使城市上风向降雨增加；城市冠层粗糙度进一步增加会改变暴雨云团的运动方向，使城市周边降雨增加。该研究评估了城市冠层粗糙度对降雨的影响，为未来城市规划与建设提供了科学依据，对城市降雨模拟的参数选择具有参考意义。

Abstract

The impacts of underlying urban surfaces on rainfall are due to the specific dynamics and thermodynamics properties of urban areas. The weather research and forecasting model (WRF) was used in this study to simulate the heavy rainfall event on July 20, 2016 in the Xiongan New Area as an example. Different urban canopy roughness scenarios were created to study the effects of the urban canopy roughness on the storm evolution and rainfall area. The results show that the urban canopy roughness significantly impacts the storm evolution and rainfall area. When the urban canopy is not very rough, the air is heated as it passes through the urban area, resulting in water vapor convergence and rain island effects which increase the rainfall over the urban area and the downwind region. When the urban canopy is rough, the storm elements move slowly with more rainfall upwind. Increases in the urban canopy roughness may change the direction of the storm movement and increase the rainfall outside the city. This study assesses the impacts of urban canopy roughness on rainfall and provides a scientific basis for future urban planning and construction. In addition, the simulation results have reference significance for the selection of urban rainfall simulation parameters.

导出引用

邢月, 刘家辉, 倪广恒. 城市冠层粗糙度对暴雨云团运动和降雨落区的影响[J]. 清华大学学报（自然科学版）. 2020, 60(10): 845-854 https://doi.org/10.16511/j.cnki.qhdxxb.2020.22.011

XING Yue, LIU Jiahui, NI Guangheng. Impacts of urban canopy roughness on storm evolution and rainfall area[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(10): 845-854 https://doi.org/10.16511/j.cnki.qhdxxb.2020.22.011

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基金

倪广恒,教授,E-mail:ghni@tsinghua.edu.cn

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收稿日期	出版日期
2019-11-08	2020-10-15
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2020-07-09

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