Institute of Sanitary Engineering and Water Pollution Control, University of Natural Resources and Life Sciences, Vienna (BOKU), Muthgasse 18, 1190 Vienna, Austria E-mail:
Water Sci Technol. 2019 May;79(9):1798-1807. doi: 10.2166/wst.2019.181.
Pluvial flood risk is increasing in urban and rural areas due to changes in precipitation patterns and urbanization. Pluvial flooding is often associated with insufficient capacities of the sewer system or low surface drainage efficiency of urban areas. In hilly areas, hillside runoff additionally affects the risk of pluvial flooding. This article introduces a methodical approach and related evaluation criteria for a systematic analysis of potential causes of urban pluvial flooding. In the presented case study, the cause of pluvial flooding at two selected sites in a hillside settlement is investigated based on a coupled 1D/2D model of the whole hydrological catchment. The results show that even though bottlenecks in the sewer system are important, the effect of low surface drainage efficiency and hillside runoff greatly influence pluvial flooding. The knowledge of different causes of flooding can be further used for selecting and positioning appropriate adaption measures. The presented approach proved its practicability and can thus serve as a guidance and template for other applications to gain better understanding and knowledge of local specific pluvial flooding events.
由于降水模式和城市化的变化，城乡地区的洪涝风险正在增加。城市洪涝灾害通常与排水系统容量不足或城市地区地表排水效率低有关。在丘陵地区，山坡径流也会影响城市洪涝灾害的风险。本文介绍了一种系统分析城市洪涝灾害潜在原因的方法和相关评估标准。在提出的案例研究中，基于整个水文流域的一维/二维耦合模型，对山坡住区两个选定地点的城市洪涝灾害原因进行了调查。结果表明，尽管排水系统的瓶颈很重要，但地表排水效率低和山坡径流的影响很大。对洪水不同成因的了解可进一步用于选择和定位适当的适应措施。所提出的方法证明了其实用性，因此可以作为指导和模板，用于其他应用，以更好地了解和掌握当地特定的城市洪涝事件。
