Abstract
Flood is a serious challenge that increasingly produce immense economical and ecological damages in worldwide. Flood simulation is gradually becoming a central focus of the hydrology in recent years. It is worthwhile to combine flood simulation with flood damage to infrastructure. The purpose of this study is to develop an approach for better urabn flood simulation at different return periods and assess the damage of flood to infrastructures in different return period. The approach is organized into four parts: design rainstorm event simulation, runoff simulation, flood inundation simulation and submerged infrastructures extraction. Base on the flood simulation, we draw the flood inundation map of Xuanwu-Qinhuai-Jianye-Gulou-Yuhuatai (XQJGY) region. Results indicated that the transportation infrastructures suffer the largest proportion of flood damage. This study simulates the inundated infrastructure at different return periods, provides a theoretical support for flood risk management.
Highlights
During recent decades, great progress has been made in China's urbanization process
The inundation maps of XQJGY with the return periods of 50 years and 100 years are shown in Fig.3 and Fig
The findings demonstrated that the transportation infrastructures suffer the largest proportion of flood damage
Summary
Great progress has been made in China's urbanization process. Rapid urbanization has put a lot of pressure on the environment, including water resources and flood risk management, for which more sustainable results are being sought. Urban flooding is caused by extreme runoff in a developed area where drainage is insufficient. This runoff travels over the surface, pooling in lowlying areas within the catchment until it drains, infiltrates, or evaporates. The infiltration rates in the urban environment tend to be much lower than that of a natural environment due to the modification of hydrologic passageway and the use of impermeable surface [2]. When rapid extreme rainfall events occur, the infrastructure within the city will be severely impacted. This risk is likely to be further exacerbated by changes in the intensity and magnitude of extreme events due to climate change. Based on the above situation, the flood simulation becomes increasingly important and urgent, which suggests decision makers to take flood prevention measures in advance, minimizing the economic losses and casualties
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