Flooding Hazard of Union Station and Impact of Ridership due to Climate Change-an Example of Banqiao Main Station
- 1Center for Weather and Climate Disaster Research, National Taiwan University, Taipei, Taiwan (vovman@gmail.com)
- 2Center for Weather and Climate Disaster Research, National Taiwan University, Taipei, Taiwan (akuanchang@gmail.com)
- 3Center for Weather and Climate Disaster Research, National Taiwan University, Taipei, Taiwan (kent0115@gmail.com)
- 4Center for Weather and Climate Disaster Research, National Taiwan University, Taipei, Taiwan (jslai525@ntu.edu.tw )
- 5Center for Weather and Climate Disaster Research, National Taiwan University, Taipei, Taiwan (yctan@ntu.edu.tw )
This study adopts the rainfall scenario generated by TCCIP (The Taiwan Climate Change Projection Information and Adaptation Knowledge Platform) based on IPCC AR5, which provides the 95th percentile of Taipei’s maximum 24-hour cumulative rainfall due to climate change. The baseline of this scenario is 404 mm for 1979-2008, and the projected rainfall is 517 mm for the future mid-century (2039-2065).
The flooding potentials of the Taipei Mass Rapid Transit (MRT) stations are obtained by applying the scenarios of rainfalls and the corresponding rainfall patterns of each rainfall station to a two-dimensional flood model. The flooding simulations of baseline and future scenarios show that Jingan Station and Fu-Jen University Station have the highest flooding potential, with a maximum flooding depth of 2 meters. The flooding hazard factors include flooding depth, flow velocity, and rising rate of water surface level. We adopted those factors to analyze the flooding hazard at Banqiao Main Station, which unites Banqiao Railway Station, a high-speed rail station, and Banqiao MRT station. It has a severe flooding potential and a large traffic volume. Because the mid-century rainfall is 1.43 times that of the baseline, the corresponding flooded area of the future scenario is also increased. As a result, the flooding hazards around the exits of Banqiao Main Station are high within the 300 m buffer for the baseline. In contrast, the very high flood hazard was found in a 200m-300m buffer for the future scenario.
MRT Banqiao Station has 5 entrances/exits, while Banqiao Railway Station has 6 entrances/exits, a total of 11. The average daily ridership at this union station before Covid-19 is 159,239 people/day. The impact ratio of the ridership is set by the degree of flood hazard for each entrance/exit. In the future scenario, the number of affected people is roughly estimated to be 11,611 people/day, which is about 7% of daily ridership before Covid-19.
How to cite: Lin, Y.-J., Chang, H.-K., Ke, K.-Y., Lai, J.-S., and Tan, Y.-C.: Flooding Hazard of Union Station and Impact of Ridership due to Climate Change-an Example of Banqiao Main Station , EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-3073, https://doi.org/10.5194/egusphere-egu23-3073, 2023.
