Analysis on exposure of disaster-bearing bodies and pedestrians' instability risk under urban waterlogging

doi:10.16265/j.cnki.issn 1003-3033.2020.10.015

Abstract

Abstract: In order to reduce casualties and property losses caused by urban floods, a urban flood model of Wuhan south lake was established based on hydraulic model of MIKE 21. Firstly, flood process, which was synthesized by rainstorm intensity formula and Chicago rain pattern, was simulated for designed rainfall with different recurrence periods, rainfall duration of 120 min and a storm peak coefficient of 0.4. Then, exposure of roads, buildings and other disaster-bearing bodies were analyzed from dimensions of rainfall time and water depth by utilizing GIS spatial analysis technology. Lastly, with water accumulation points for rainfall once in 20 years selected, instability risk of pedestrians within a certain range was analyzed. The results show that exposure of disaster-bearing bodies in the region is positively correlated with change of rainstorm recurrence period, and maximum exposure is concentrated in 60-80 min after rainfall. Moreover, pedestrians will have 65 min instability risk after 45-110 min of rain, for which early warning should be made and preventive measures be taken.

Key words: urban floods, exposure of disaster-bearing bodies, pedestrian instability risk analysis, MIKE 21 model, geographic information system(GIS)

CLC Number:

X915.5

SONG Yinghua, ZHANG Zhe, FANG Danhui. Analysis on exposure of disaster-bearing bodies and pedestrians' instability risk under urban waterlogging[J]. China Safety Science Journal, 2020, 30(10): 105-111.

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