Assessment of storm surge inundation and potential hazard maps for the southern coast of Taiwan
- 225 Downloads
An integrated storm surge and flood inundation modeling system was developed and applied to simulate storm surges and inundation in the Gaoping River basin and its adjacent coastal area in southern Taiwan. An unstructured grid, three-dimensional hydrodynamic model was driven by the tidal elevation at the open boundaries and freshwater discharge at the upriver boundary. The model was calibrated and validated against the observed water levels for five typhoons. The results indicate a reasonable agreement between the model simulation and the observational data. A frequency analysis was used to fit the maximum surge height of historical typhoons induced by storm surges and yield the storm surge height for different return periods. The validated model was then applied to assess the potential hazard maps for different return periods as well as the influence of the sea level rise on the potential hazard maps. The typhoon-induced storm surge under the 200-year return period matched the 200-year return period peak flow, resulting in the maximum extent and depth of inundation in the low-lying area. Furthermore, the simulated results reveal that the sea level rise would enhance the flooding areas. The inundation hazard maps developed in this study could be a useful tool for planning the evacuation of residents living in low-lying areas and the decision-making of flood risk management on the coasts and floodplains.
KeywordsStorm surge Inundation Hazard map Typhoon Three-dimensional model Gaoping River and adjacent coastal sea
The project was funded by the Ministry of Science and Technology, Taiwan, Grant No. 103-2625-M-239-001. The authors would like to express their appreciation to the Taiwan Center Weather Bureau and the Water Resources Agency for providing the observational data. The authors also sincerely thank two anonymous reviewers for their valuable comments.
- Gelder PV, Neykov NM (1998) Regional frequency analysis of extreme water levels along the Dutch coast using l-moments: a preliminary study. In: International scientific conference on stochastic models of hydrological processes and their applications to problems of environmental preservation, Moscow, Russia, pp 14–20Google Scholar
- Katsman CA, Sterl A, Beersma JJ, van den Brink HW, Church JA, Hazeleger W, Kopp RE, Kroon D, Kwadijk J, Lammersen R, Lowe J, Oppenheimer M, Plag HP, Ridley J, von Storch H, Vaughan DG, Vellinga P, Vermeersen LLA, van de Wal RSW, Weisse R (2011) Exploring high-end scenarios for local sea level rise to develop flood protection strategies for a low-lying delta-The Netherlands as an example. Clim Change 109:617–645CrossRefGoogle Scholar
- Management Committee for Gaoping River basin (2012) The 2012 annual report on the management and implementation of Gaoping river basin (in Chinese)Google Scholar
- Weibull W (1951) A statistical distribution function of wide applicability. J Appl Mech 18:293–297Google Scholar