Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China E-mail:
Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China; Key Laboratory of Water Ecology and Flow Structure Engineering, University of Yunnan, Kunming 650500, China.
Water Sci Technol. 2023 Aug;88(4):901-921. doi: 10.2166/wst.2023.251.
Urban flooding is becoming a significant urban epidemic in many nations throughout the world as a result of land use and climate change, and regular heavy rains. In this study, we choose to investigate the viability of Sponge City concepts for flood mitigation based on low impact development (LID) strategies in a 26.66 km area situated in Guinea's capital city of Conakry. The Storm Water Management Model (SWMM5) was used to simulate the impact of LID measures on the lowering of runoff peaks and node flooding. Simulation results before and after LID facilities are compared in order to understand how LID measures improve flood mitigation. The study showed that LID techniques effectively reduce runoff, which helps mitigate the effects of flooding. The study demonstrated that all LID, whether used singly or in combination, can lower runoff and flooding. However, when it comes to reducing runoff and flooding, LID-combinations perform better than individual LID implementations. For the five return periods (one, five, 20, 50, and 100 years), the LID-combination reduced runoff by 67.83, 65.02, 50.44, 40.18, and 35.88%, and reduced flooding by 85.32, 72.65, 54.05, 46.17, and 42.80%, respectively. Additionally, the reduction rate of overflow junctions is 100, 100, 80, 67, and 70%, respectively.
城市内涝在世界上许多国家正成为一种重大的城市灾害，这是由于土地利用和气候变化以及经常出现的强降雨造成的。在这项研究中，我们选择研究海绵城市概念在几内亚首都科纳克里的 26.66 平方公里范围内基于低影响开发（LID）策略减轻洪水的可行性。使用雨水管理模型（SWMM5）模拟 LID 措施对降低径流峰值和节点洪水的影响。比较 LID 设施前后的模拟结果，以了解 LID 措施如何改善洪水缓解效果。研究表明，LID 技术可以有效减少径流，从而有助于减轻洪水的影响。研究表明，所有 LID 措施，无论是单独使用还是组合使用，都可以降低径流和洪水。然而，在降低径流和洪水方面，LID 组合的效果优于单个 LID 措施。对于五个重现期（一年、五年、二十年、五十年和一百年），LID 组合分别减少了 67.83%、65.02%、50.44%、40.18%和 35.88%的径流，减少了 85.32%、72.65%、54.05%、46.17%和 42.80%的洪水，并且溢洪道的减少率分别为 100%、100%、80%、67%和 70%。
