Study of inundation events along the southern coast of Java and Bali, Indonesia (case studies 4-9 June 2016)

It is important to understand the causes of costal inundation in order to supporting coastal hazard mitigation strategies, especially for the island nation like Indonesia. We investigated the interaction of waves, swell, tides and sea level variability at the coastal inundation events that occurred along southern coast of Java and Bali on June 4 to 9, 2016. The increase of high water level and low water level clearly seen compared to the same astronomic phase tides data before and after the inundation events. The high value of sea level anomaly (SLA) also indicates that there is sea level variability. The wave and swell analysis suggests that extreme waves and swell which occurs during the early of June 2016 has a contribution to the rising of the sea level during the inundation time span. Swell has a major contribution in the wave action that triggering this inundation event given that the significant waves that occur in the time span of the inundation were not affected by wind, but by the swell. This research has shown that the interaction of astronomical tides, SLA height, and high waves and swell along the southern coast of Java and Bali was causing the inundation events at 4-9 June 2016.