WAVE FORCE OF TSUNAMI KRAKATAU 1883 ON THE OUTER SEA DIKE IN JAKARTA BAY

Abstract

Volcanic activity of Mount Anak Krakatau has been increased in the recent years. One of the consequences was Tsunami Sunda Strait in 2018. This heightened the awareness of the potential impact of a tsunami induced by Anak Krakatau for the construction of NCICD Project. This research is aimed to calculate the potential impact in the terms of wave force. Tsunami Krakatau 1883 was used as reference for two reasons. First, the comprehensive research has been conducted for this event. Second, the magnitude of Mount Anak Krakatau-induced tsunami will not be higher than that of Tsunami Krakatau 1883. Non shallow water equation-based numerical model is applied to simulate the tsunami. Time series from the model result is extracted as an input to calculate the wave force. There are four different method used such as Rule of Thumb, Linear Theory, Sainflou Method and Goda Method. The results show that the tsunami will hit the outer sea dike with a minimal force of 100 kN and a maximum force of 400 kN. OSD1-A is the safest sea dike since the tsunami only will hit the structure with a half force.