MODELLING OF KRAKATOA TSUNAMI WAVE PROPAGATION AND COMMUNITY ENGAGEMENT BASED ON SWOT ANALYSIS IN SOUTHERN LAMPUNG, INDONESIA

Ravindra Jayaratne,Tomoya Shibayama,Hendra Achiari,Aldhiansyah Muhammad Fauzi

doi:10.9753/icce.v36v.currents.30

Abstract

The eruption of Krakatoa which occurred on the 22 December 2018 caused an avalanche from the Gunung Anak Krakatau (GAK) body into the sea, causing a tsunami in the Sunda Strait. The tsunami affected Lampung (Sumatra) and Banten (Java) provinces in Indonesia. Based on the field observations made by Takabatake et al. (2019) in the southern part of Lampung, it was identified that there were severely damaged areas in Lampung; i.e. East Way Muli, Central Way Muli, and Kunjir villages. A numerical model was developed to simulate past and future tsunami wave propagation scenarios. In addition, the strategic planning technique of SWOT analysis was carried out in order to make recommendations for the resilience of local coastal communities for future tsunami events in Southern Lampung.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/YR_UX_SdS6c

Highlights

The eruption of Krakatoa which occurred on the 22 December 2018 caused an avalanche from the Gunung Anak Krakatau (GAK) body into the sea, causing a tsunami in the Sunda Strait
The numerical model results were compared with the field measurements of Takabatake et al (2019) in order to check the applicability and robustness of the model
This confirms that CGWAVE numerical model is capable of producing the past tsunami conditions with satisfactory accuracy

Summary

INTRODUCTION

The eruption of Krakatoa which occurred on the 22 December 2018 caused an avalanche from the Gunung Anak Krakatau (GAK) body into the sea, causing a tsunami in the Sunda Strait. MODELING SCENARIOS & RESULTS Numerical experiments were carried out based on different tsunami wave conditions (e.g. wave periods, directions and offshore wave amplitudes) for the 22 December 2018 tsunami. The numerical model results were compared with the field measurements of Takabatake et al (2019) in order to check the applicability and robustness of the model This confirms that CGWAVE numerical model is capable of producing the past tsunami conditions with satisfactory accuracy.

Maximum tsunami wave

Simulated East Way wave

Kunjir Transect

CONCLUSIONS