Modelling of Krakatoa Tsunami Wave Propagation and Community Engagement Based on SWOT Analysis in Southern Lampung, Indonesia

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

One dimensional numerical modeling of point source pollutant distribution in estuarine river basin

Pollutant is product that produced from every activities, both natural and human-made. In many case,\ud mostly, pollutant brings a negative effect to the environment. It comes to the environment in many ways. This paper\ud would be modelled a point source pollution in river in one dimensional numerical modelling to orient hydrological\ud model by using explicit and implicit scheme. In the end, the concentration and spreadness in the river would be known.\ud It would be modelled in three case condition which is has the same initial and boundary condition. Those cases give a\ud different value of velocity of river and reaction term per day. The point source pollution located one of third of the river\ud length. From the general form of the convective diffusion, this numerical modelling neglected the area because it\ud assumed that the area is linear.To determine the constant of ??, ??, ?? variables can be simplified in to the\ud matrixsimultaneous equations. The output gives the graph time and concentration. This paper brings the similar result\ud between hypothesis and the numerical modelling

Towards Comprehensive Tsunami Mitigation Study: A Case of Legundi Island

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