刘家宏, 石虹远, 梅超, 王浩, 宋天旭, 栾清华. 城市下垫面空间格局对社区尺度内涝过程的影响模拟[J]. 水科学进展, 2022, 33(6): 881-893. DOI: 10.14042/j.cnki.32.1309.2022.06.003
引用本文: 刘家宏, 石虹远, 梅超, 王浩, 宋天旭, 栾清华. 城市下垫面空间格局对社区尺度内涝过程的影响模拟[J]. 水科学进展, 2022, 33(6): 881-893. DOI: 10.14042/j.cnki.32.1309.2022.06.003
LIU Jiahong, SHI Hongyuan, MEI Chao, WANG Hao, SONG Tianxu, LUAN Qinghua. Effect of urban subsurface spatial pattern on community-scale flooding processes via numerical simulation[J]. Advances in Water Science, 2022, 33(6): 881-893. DOI: 10.14042/j.cnki.32.1309.2022.06.003
Citation: LIU Jiahong, SHI Hongyuan, MEI Chao, WANG Hao, SONG Tianxu, LUAN Qinghua. Effect of urban subsurface spatial pattern on community-scale flooding processes via numerical simulation[J]. Advances in Water Science, 2022, 33(6): 881-893. DOI: 10.14042/j.cnki.32.1309.2022.06.003

城市下垫面空间格局对社区尺度内涝过程的影响模拟

Effect of urban subsurface spatial pattern on community-scale flooding processes via numerical simulation

  • 摘要: 为研究城市下垫面空间格局对社区尺度内涝过程的影响, 构建社区尺度下的8种不同城市下垫面空间格局, 并建立相应的城市内涝数值模型, 模拟6种不同重现期(2 a, 5 a, 10 a, 20 a, 50 a, 100 a)设计降雨条件下内涝过程; 基于不同下垫面和降雨情景下的内涝数值模拟结果, 分别从内涝淹没特征值、时空变化过程、水动力特性等方面开展分析。结果表明: ①城市下垫面空间格局对社区尺度内涝淹没特征值、淹没时空变化过程和内涝积水流速分布均有一定影响; ②设计降雨重现期为2 a、5 a、50 a和100 a时, 不同城市下垫面空间格局间的积水总量峰值、积水面积峰值、区域最大积水深差别显著, 重现期为10 a和20 a时, 无明显差别; ③内涝积水较大流速分布主要集中在道路交汇处, 在本研究构建的情景中, 最大流速的差值占比为31.9%;④在8种不同城市下垫面空间格局中, 环形放射型格局在应对内涝方面更具弹性。本研究可为城市下垫面空间管控和城市内涝形成机理研究提供科学参考。

     

    Abstract: To investigate the effect of the spatial pattern of urban subsurface on flooding processes at the community scale, eight different spatial patterns of urban subsurface at the community scale are constructed and the corresponding numerical models of urban flooding are established to simulate the flooding processes under six different design rainfall conditions, with recurrence periods ranging from 2 to 100 a. Based on the simulation results, the flooding characteristics, spatial and temporal changes, and hydrodynamic characteristics are analyzed. The results indicate the following: ① The spatial pattern of the urban substrate affects the inundation characteristics, the spatial and temporal variations of inundation, and the distribution of inundation flow rate at the community scale. ② The peak total ponding volume, peak ponding area, and maximum regional ponding depth differ significantly between the spatial patterns of urban substrates for design rainfall return periods of 2 a, 5 a, 50 a, and 100 a, whereas their differences are slight for return periods of 10 a and 20 a. ③ The distribution of higher flow velocities in flooded water is primarily concentrated at road intersections, with the difference in the maximum flow velocity being reflected in 31.9% of the scenarios analyzed. ④ Among the eight different spatial patterns of urban substrates, the circular radial pattern can manage internal flooding more effectively. The result of this study can provide scientific reference for the spatial control of urban subsurface and for investigating the formation mechanism of urban flooding.

     

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