Center of Integrated Geographic Information Analysis, School of Geography and Planning, Sun Yat-sen University, Guangzhou, China.
Department of Geography, University of Cincinnati, Cincinnati, OH, USA.
Sci Total Environ. 2018 May 1;622-623:394-401. doi: 10.1016/j.scitotenv.2017.11.358. Epub 2017 Dec 13.
Extensive research has focused on modelling and analysis of urban flooding in relatively small catchments. Findings in small areas tend to be site-specific, and may not be applicable to larger study areas. Larger scale studies can identify general patterns and influential factors; however, few studies have investigated urban flooding on a larger scale such as a metropolitan area. In this study, we explored the spatial-temporal patterns of urban flooding during the period of 2009-2015 in the central area of Guangzhou, China. Under the framework of Pressure (precipitation and impervious surface)-State (urban flooding)-Response (drainage improvement), we evaluated reasons for the State change and effectiveness of the Response. Overall the urban flooding state showed a fluctuating and improving trend. The fluctuation of the flooding state trend is due to precipitation variation, and the improving trend is attributed to drainage improvement. Furthermore, drainage improvement in the upstream area had led to new flooding in the downstream area. It is evident that the mitigation effect of urban flooding in Guangzhou varied significantly across the city. It is further suggested to regularly collect urban flooding records in cities with flood risk, so that more appropriate policies and measures about urban flooding mitigation can be developed.
大量研究集中在相对较小集水区的城市洪水建模和分析上。小区域的发现往往是特定于地点的，可能不适用于更大的研究区域。更大规模的研究可以识别一般模式和影响因素；然而，很少有研究在更大的范围内（如大都市区）研究城市洪水。在这项研究中，我们探讨了 2009-2015 年期间中国广州市中心区城市洪水的时空模式。在压力（降水和不透水面）-状态（城市洪水）-响应（排水改善）的框架下，我们评估了状态变化的原因和响应的有效性。总体而言，城市洪水状况呈波动和改善趋势。洪水状态趋势的波动是由于降水的变化，而改善趋势则归因于排水改善。此外，上游地区的排水改善导致下游地区出现新的洪水。显然，广州城市洪水的缓解效果在全市范围内差异很大。进一步建议在有洪水风险的城市定期收集城市洪水记录，以便制定更合适的城市洪水缓解政策和措施。
