关键词: 地铁, 情景分析, 暴露性, 暴雨内涝, 上海

Abstract:

Due to rapid urbanization, most cities in the world like Shanghai have a large number of underground facilities including public transport and commercial facilities such as subway, parks, shopping malls, etc. With the continuous development of underground spaces, the threat of rainstorm waterlogging is increasing. One of the significant components of impacts from rainstorm waterlogging is possibility of damage to underground facilities. Under the background of dramatic increase of extreme weather events, the safety issues of underground spaces against rainstorm waterlogging have become an important aspect of urban safety. The present study focused on subway in Shanghai central urban area, and analyzed the exposure of rainstorm waterlogging on subway based on multiple scenario perspective. Considering a series of impact factors of rainstorm waterlogging in urban area, the present study established a framework for exposure analysis of rainstorm waterlogging on subway through the combination of hydrological modeling and concept model for rainstorm waterlogging affected frequency. The results show that the exposure of subway in Shanghai central urban area was not very high. The total number of subway station exits which might suffer rainstorm waterlogging was only 40. Meanwhile, the number of inundated subway exits presents a remarkable increasing trend as increasing rainstorm intensity. Shanghai West Railway Station exit 1 and Loushanguan Road Station exit 3 have high exposure rank. The number of subway station exits with medium exposure was 18. There were 20 subway station exits, which have low exposure rank. The exposure index (ES) value indicates that there are obvious differences of exposure degree between different subway lines. Overall, Subway line 2 and line 11 belong to high exposure subway line; line 8 and line 10 have medium exposure rank; and line 1, line 4, line 7 and line 9 show low waterlogging exposure. These results will provide reference for the local government to improve waterlogging risk management.

Key words: subway, scenario analysis, exposure, waterlogging, Shanghai