Towards Comprehensive Tsunami Mitigation Study: a Case of Legundi Island

  • Elsa Rizkiya Kencana Ocean Engineering Department, Faculty of Infrastructure and Regional Development, Institut Teknologi Sumatera, Indonesia
  • Mustarakh Gelfi Ocean Engineering Department, Faculty of Infrastructure and Regional Development, Institut Teknologi Sumatera, Indonesia
  • Hendra Achiari Ocean Engineering Department, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Indonesia


Sunda Strait Tsunami happened in December 2018 due to a flank collapsed of Mount of Anak Krakatoa. Lampung Province was affected by Sunda Strait Tsunami at various locations that close to Mount of Anak Krakatoa. The research is conducted to modelling the tsunami wave that happened at Legundi Island in 1D model using SwanOne software. The methodology of the research is using data input from bathymetric survey and apply the wave transformation equations in the nearshore using SwanOne software to do the 1D model. There are four scenarios to do the wave modelling. All scenarios consider from former study about Sunda Strait Tsunami 2018. The results from all scenarios are verified by prior research from Takabatake (2019) of inundation height in Legundi Island, it is 3,34 m. The result shows the inundation height from wave modelling is a combination of wave height (1,533 m), water depth (1,658 m) and wave setup (0,215 m), and the outcome is 3,406 m. The model shows a fine result because the percentage error of the model is only 0,769%, which is below 5%. This research can be a good approach for another wave modelling in other locations and also to do further research to wave modelling in 2D model.


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[1] T. Takabatake, et al. “Field survey and evacuation behaviour during the 2018 Sunda Strait tsunami,” in Coastal Engineering Journal. ISSN: 2166-4250 (Print) 1793-6292 (Online), 2019. DOI: 10.1080/21664250.2019.1647963
[2] S. T. Grilli, et al. “Modelling of the tsunami from the December 22, 2018, lateral collapse of Anak Krakatau volcano in the Sunda Straits, Indonesia,” in Nature Scientific Reports 9:11946, 2019.
[3] NCEI/WDS. (accessed in August 2020)
[4] M. Gelfi, E. R. Kencana, and H. Achiari, “Tsunami Wave Transformation in Selesung Bay (Lampung),” in IOP Conf. Ser.: Earth Environ. Sci. 698. 012027, 2021. DOI: 10.1088/1755-1315/698/1/012027
[5] H. Achiari, and M. Gelfi, “Tsunami preparedness analysis for the community of Legundi island – Lampung,” in IOP Conf. Ser.: Earth Environ. Sci. 537 012020, 2020. DOI:10.1088/1755-1315/537/1/012020
[6] A. Muhari, et al., “The December 2018 Anak Krakatau Volcano Tsunami as Inferred from Post-Tsunami Field Surveys and Spectral Analysis,” in Pure Appl. Geophys. 176, 2019, pp. 5219–5233.
[7] Syamsidik et al., “The December 22, 2018, mount Anak Krakatau volcanogenic tsunami on Sunda strait coast, Indonesia: tsunami and damage characteristics,” in Nat. Hazards Earth Syst. Sci., 20, 2020, pp. 549–565.
[8] T. Shibayama, et al., “Survey report of the 2018 Sunda Strait tsunami,”: Research Institute of Sustainable Future Society, Waseda University, Japan (accessed in August 2020)
[9] J. C. Borrero, et al., “Field Survey and Numerical Modelling of the December 22, 2018 Anak Krakatau Tsunami,” in Pure Appl. Geophys. 177, 2020, pp. 2457–2475.
[10] L. H. Holthuisen, Waves in oceanic and coastal waters. Cambridge: Cambridge University Press, 2007, ISBN-13 978-0-521-86028-4
[11] N. Booji, R. C. Ris, and L. H. Holthuijsen, “A third wave model for coastal regions,” in Journal of Geophysical Research, Vol. 104, No. C4, 1999, pp. 7649-7666
[12] SwanOne User Manual V1.3. April 2018. TU Delft, 2018.
How to Cite
KENCANA, Elsa Rizkiya; GELFI, Mustarakh; ACHIARI, Hendra. Towards Comprehensive Tsunami Mitigation Study: a Case of Legundi Island. Journal of Science and Applicative Technology, [S.l.], v. 5, n. 2, p. 253-258, july 2021. ISSN 2581-0545. Available at: <>. Date accessed: 20 sep. 2021. doi: