Spatial-temporal pattern of urban flooding in Guangzhou, China

Authors: Huabing Huang*, Sun Yat-sen University, Xi Chen, University of Cincinnati, Zhanqiang Zhu, Sun Yat-sen Unversity, Yuhuan Xie, Sun Yat-sen University, Lin Liu, University of Cincinnati, Xianwei Wang, Sun Yat-sen University, Xina Wang, Sun Yat-sen University, Kai Liu, Sun Yat-sen University
Topics: Hazards, Risks, and Disasters, Water Resources and Hydrology
Keywords: Urban flooding, Pressure-State-Response, Spatial scale, Drainage improvement, Guangzhou.
Session Type: Paper
Day: 4/13/2018
Start / End Time: 10:00 AM / 11:40 AM
Room: Napoleon A3, Sheraton, 3rd Floor
Presentation File: No File Uploaded

There exists extensive literature on urban flooding, with a focus on modeling and analysis of small catchment areas. However, few studies have investigated urban flooding on a larger scale such as a metropolitan area. In this study, we explored spatial-temporal pattern of urban flooding during the period of 2009-2015 in the central area of Guangzhou, China. Under the Pressure (precipitation and impervious surface)-State (urban flooding)-Response (drainage improvement) framework, we evaluated reasons for the State change and effectiveness of the Response. Overall the urban flooding state showed a fluctuating and decreasing trend. The fluctuation is mainly attributed to precipitation variability, and the decrease related to drainage improvement. Furthermore drainage improvement in the upstream had led to new flooding in downstream area. It is evident that the mitigation effect of flooding in Guangzhou varied significantly across the city. It is further suggested to collect urban flooding records in cities with flood risk, so that more appropriate policies and measures about urban flooding mitigation can be developed.

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