To investigate the impact of spatiotemporal variations in typhoon-induced rainfall on the processes of urban waterlogging in coastal cities of China,a numerical model of surface water dynamics and its associated transport processes was applied.The central business district of Ningbo,a coastal city in China,was selected as the study area.The scope of this research encompassed a comprehensive examination of urban waterlogging under various scenarios,including conditions featuring both moving typhoon-induced rainfall and stationary typhoon-induced rainfall.The findings of this study are as follows:① Rainfall moving in different directions leads to a delayed accumulation of water at waterlogging monitoring sites.The delay ranges from 0 to 0.5 hours when the rainfall moves directly westward or northwestward,1.5 hours when moving directly northward,and 1.5 to 2 hours when moving in a direction 30 degrees east of north.② In 92％of the simulated scenarios,the movement of rainfall results in a reduction in both the volume and depth of water accumulation.The maximum reduction rate of peak water depth reaches 4.46％.As the return period of rainfall increases from 5 a to 50 a,the reduction rate of peak water depth decreases from 0.49％to0.10％.③ The impact patterns of bimodal and unimodal rainfall on urban waterlogging are similar,but the former has a comparatively lesser impact.Therefore,in cities affected by typhoon-induced rainfall,the disaster prevention and mitigation ministry should give special consideration to the spatiotemporal movement characteristics of the typhoon-induced rainfall.This approach is crucial for further enhancing urban flood resilience and mitigating disaster losses.
关键词
台风暴雨/降雨移动/城市内涝/数值模拟/沿海城市
Key words
typhoon rainfall/rainfall movement/urban waterlogging/numerical simulation/coastal city
维普
万方数据