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由于极端降雨事件频发,城市区域内涝问题日益突出。为探究极端降雨情景下区域积水风险特征,以广州市某居住小区为例,构建区域排涝模型,采用投影寻踪技术分析区域内涝风险。结果表明,除积水时数、最大积水速率和积水总量外,所选指标投影分量值均趋近于0;在设计暴雨重现期为5、10、20、50年时,分别有1、3、4、4个节点具有积水风险,其中积水风险最大的节点为J23,其积水风险值约为1.8;随着降雨重现期的增大,区域受雨洪灾害的影响范围和程度亦随之增大。此外,对排水管网系统积水黑点和区域积水风险的定性定量分析,揭示了不同降雨强度下区域积水风险变化特征,对区域雨洪灾害的治理具有一定的指导意义。
Owing to the frequent occurrence of extreme rainfall events, waterlogging problems in urban areas have become increasingly prominent. In order to explore the characteristics of regional water catchment risk in extreme rainfall scenarios, taking a residential area in Guangzhou as an example, a regional drainage model was constructed and projection pursuit technology was used to analyze the risk of waterlogging in the area. The results show that except for the number of hydrological hours, the maximum water accumulation rate and the total amount of water, the projection values of the selected indexes are close to zero. When the design reproductive periods are 5, 10, 20 and 50 years respectively 1, 3, 4 and 4 nodes have the risk of water accumulation. Among them, the node with the highest risk of water accumulation is J23, and the risk of water accumulation is about 1.8. With the increase of rainfall reappearance, the area is affected by rain and flood The extent and extent of the effects also increase. In addition, qualitative and quantitative analysis of the risk of stagnant black spots and regional waterlogging in the drainage network reveals the characteristics of regional water changes under different rainfall intensities, which is of guiding significance for the treatment of regional floods.