Flood impacts on urban road connectivity in southern China.

Effective measures to improve road accessibility during storms are required as traffic congestion caused by storm floods increasingly constrains the efficiency of urban commuting. However, flood impacts on urban road connectivity are not yet well assessed due to inaccurate simulation of flood processes in urban areas where high-resolution data for drainage networks and gauged hydrological data are insufficient. Thus, this study assesses flood impacts on road network connectivity in an urban area of southern China through joint modeling of 1-D hydrodynamic processes in drainage networks and 2-D flood inundation processes on roads using MIKE Urban and MIKE 21. High-resolution DEM images of 5 m and a drainage network of 5635 pipelines were used for urban hydrological simulation. Flood depths were gauged for model calibration and validation by recruited volunteers in the context of citizen science. The results show that road network connectivity decreases as rainfall increases. More than 40% of road connectivity is lost in the study area when a 1-in-100-year return period rainfall occurs. The study results can help to inform more adaptive strategies for local flood control. The study methods are also applicable to improving urban hydrological modeling in broader regions.

Zhou R ，Zheng H ，Liu Y ，Xie G ，Wan W ... -  《Scientific Reports》

Urban Flood Modeling and Risk Assessment with Limited Observation Data: The Beijing Future Science City of China.

Xu H ，Wang Y ，Fu X ，Wang D ，Luan Q ... -  《-》

Study on the response analysis of LID hydrological process to rainfall pattern based on framework for dynamic simulation of urban floods.

Liu C ，Xie T ，Yu Q ，Niu C ，Sun Y ，Xu Y ，Luo Q ，Hu C ... -  《-》

An overview of flood-induced transport disruptions on urban streets and roads in Chinese megacities: Lessons and future agendas.

Lu X ，Shun Chan FK ，Chen WQ ，Chan HK ，Gu X ... -  《-》

A hybrid method for evaluating the resilience of urban road traffic network under flood disaster: An example of Nanjing, China.

Urban road traffic network (URTN) plays an important role in city operation, while it is also suffered a lot from the urban flood disasters which caused negative impacts frequently, like traffic congestion, and road collapse. The function loss of URTN not only destroy normal urban life and work order, but also pose a serious threat to people's lives and properties. Therefore, it is urgent to quantitatively explore the flood resilience of URTN. The concept of resilience puts forward new ideas to help solve the problem of urban flooding disasters from a holistic view. Exploring the flood resilience of urban traffic network may help to mitigate urban flooding and improve the urban resilience. This paper developed a flood resilience evaluation model of URTN, which contains 26 indicators based on the 4R theory. A case study was conducted in southern China to validate the model with real data. It evaluated the urban flood resilience of road traffic network with a comparison of before and after reconstruction of the pipeline. The results demonstrated that the flood resilience of URTN is at a relatively low level in the study area, and the limitation of single traditional engineering measure to the flood resilience of URTN. Suggestions such as strengthening the citizen participation and enhancing the complementary capability of multiple engineering measures are proposed to further promote the flood resilience of the URTN.

Li D ，Zhu X ，Huang G ，Feng H ，Zhu S ，Li X ... -  《-》