Impact of Climate Change on Flood Hazard at Airports on Pacific Islands: A Case Study of Faleolo International Airport, Samoa
Lianhui Wu*, Kenji Taniguchi**, and Yoshimitsu Tajima*,
*Department of Civil Engineering, The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
**Faculty of Geosciences and Civil Engineering, Kanazawa University, Ishikawa, Japan
Climate change is believed to have increased the intensity and frequency of heavy rainfall, and also to have caused sea level rises over this century and beyond. There is widespread concern that small-island nations are particularly vulnerable to increasing risk of inland flood due to such climate change. Understanding the impact of climate change on flood hazard is of great importance for these countries for the development of better protection and adaptation strategies. This study conducted a case study focusing on the impact of climate change on flood hazard at Faleolo International Airport (FIA), Samoa. FIA is a typical small islands airport, located on the lowland along the coast fronted by a fringing reef. Annual maximum daily rainfalls for different return periods were first estimated for the present and future climate around FIA. The estimated rainfalls were input as the forcing of a two-dimensional flood inundation model to investigate the flooding behavior and effectiveness of probable drainage systems. Results showed that a part of the runway can be inundated under heavy rainfall. Construction of drainage pipes significantly contributes to reducing the flood hazard level. Sensitivity analysis showed that the astronomical tide level has relatively little influence on the performance of the drainage system, while the combination of sea level rise and the sea level anomaly induced by stormy waves on the fringing reef could have non-negligible impacts on the drainage system. Location of the drainage pipe is also important to effectively mitigate flooding. The time-concentration of torrential rainfall may also significantly impact the overall performance of the drainage system.
-  The Core Writing Team, R. K. Pachauri and L. A. Meyer (Eds.), “Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change,” Intergovernmental Panel on Climate Change (IPCC), 151pp., 2014.
-  J. Barnett and J. Campbell, “Climate Change and Small Island States: Power, Knowledge and the South Pacific,” Earthscan, 2010.
-  C. Farbotko and H. Lazrus, “The first climate refugees? Contesting global narratives of climate change in Tuvalu,” Global Environmental Change, Vol.22, No.2, pp. 382-390, doi: 10.1016/j.gloenvcha.2011.11.014, 2012.
-  V. Gornitz, “Global coastal hazards from future sea level rise,” Global and Planetary Change, Vol.3, Issue 4, pp. 379-398, doi: 10.1016/0921-8181(91)90118-G, 1991.
-  A. Toimil, P. Camus, I. J. Losada, G. Le Cozannet, R. J. Nicholls, D. Idier, and A. Maspataud, “Climate change-driven coastal erosion modelling in temperate sandy beaches: Methods and uncertainty treatment,” Earth-Science Reviews, Vol.202, Article No.103110, doi: 10.1016/j.earscirev.2020.103110, 2020.
-  K. Ng, P. Borges, M. R. Phillips, A. Medeiros, and H. Calado, “An integrated coastal vulnerability approach to small islands: The Azores case,” Science of the Total Environment, Vol.690, pp. 1218-1227, doi: 10.1016/j.scitotenv.2019.07.013, 2019.
-  K. Trenberth, “Changes in precipitation with climate change,” Climate Research, Vol.47, Nos.1-2, pp. 123-138, doi: 10.3354/cr00953, 2011.
-  W. K. Michener, E. R. Blood, K. L. Bildstein, M. M. Brinson, and L. R. Gardner, “Climate Change, Hurricanes and Tropical Storms, and Rising Sea Level in Coastal Wetlands,” Ecological Applications, Vol.7, Issue 3, pp. 770-801, doi: 10.2307/2269434, 1997.
-  K. Walsh and A. B. Pittock, “Potential Changes in Tropical Storms, Hurricanes, and Extreme Rainfall Events as a Result of Climate Change,” Climatic Change, Vol.39, Issue 2, pp. 199-213, doi: 10.1023/A:1005387120972, 1998.
-  T. Kubota, K. Aonashi, T. Ushio, S. Shige, Y. N. Takayabu, M. Kachi, Y. Arai, T. Tashima, T. Masaki, N. Kawamoto, T. Mega, M. K. Yamamoto, A. Hamada, M. Yamaji, G. Liu, and R. Oki, “Global Satellite Mapping of Precipitation (GSMaP) Products in the GPM Era,” V. Levizzani, C. Kidd, D. B. Kirschbaum, C. D. Kummerow, K. Nakamura, and F. J. Turk (Eds.), “Satellite Precipitation Measurement: Volume 1,” pp. 355-373, Springer, doi: 10.1007/978-3-030-24568-9_20, 2020.
-  K. E. Taylor, R. J. Stouffer, and G. A. Meehl, “An Overview of CMIP5 and the Experiment Design,” Bulletin of the American Meteorological Society, Vol.93, Issue 4, pp. 485-498, doi: 10.1175/BAMS-D-11-00094.1, 2012.
-  T. Iizumi, M. Nishimori, Y. Ishigooka, and M. Yokozawa, “Introduction to climate change scenario derived by statistical downscaling,” J. of Agricultural Meteorology, Vol.66, No.2, pp. 131-143, doi: 10.2480/agrmet.66.2.5, 2010 (in Japanese with English abstract).
-  T. Iizumi, M. Nishimori, K. Dairaku, S. A. Adachi, and M. Yokozawa, “Evaluation and intercomparison of downscaled daily precipitation indices over Japan in present-day climate: Strengths and weaknesses of dynamical and bias-correction-type statistical downscaling methods,” J. of Geophysical Research: Atmospheres, Vol.116, Issue D1, doi: 10.1029/2010JD014513, 2011.
-  AW3D Enhanced, https://www.aw3d.jp/en/products/enhanced/ [accessed January 6, 2021]
-  C. K. Birdsall and A. B. Langdon, “Plasma Physics via Computer Simulation,” McGraw-Hill, 1984.
-  Permanent Service for Mean Sea Level, https://www.psmsl.org/data/obtaining/stations/1840.php [accessed January 6, 2021]
-  Y. Tajima, T. Shoji, and K. Taniguchi, “Study on Probabilistic Inundation Hazard along the Coast of South Pacific Islands: Case study at Lakeba Island in Fiji,” J. of Japan Society of Civil Engineers Ser. B2 (Coastal Engineering), Vol.76, No.2, pp. I_1231-I_1236, doi: 10.2208/kaigan.76.2_I_1231, 2020.
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