MARINE DEBRIS DRIFT ON BALI STRAIT BY USING PARTICLE TRAJECTORY MODEL

• Main Author: EDGINA YOSAFAT (NIM 22410006); Pembimbing: Ivonne M. Radjawane, M.Si., Ph.D., dan Dr. Eng. To, FARICA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/14167
• Institution: Institut Teknologi Bandung

Indonesian seas, including Bali Strait, has been heavily polluted. The seasonal marine debris stranded at the west coast of Bali when northwest monsoon wind blows over the straits. On this research, field study was conducted on 18-20 March 2012 to determine the amount and types of marine debris that reach Kuta Beach Bali. In one season, the amount of the debris could reach up to 5,400-8,400 meter cube in volume, in which plastic and wood dominated the type of the debris. Logs with large size were also found in significant amount. With its Alternating Direction Implicit Double Sweep Method, MIKE21 Hydrodynamics Module is used to simulate velocity field in Bali Strait. In north area the current pattern is more influenced by tide, whereas in other areas are more influenced by monsoon wind. This result is further used to predict the particle trajectory around Bali Strait by using MIKE21/3 Pa/Sa Module. The particle sources itself are assumed from rivers/waterways facing Bali Strait. There are 3 skenarios that have been conducted. In the first scenario, the particles are only released at the beginning of the simulation. In the second and third scenario, the sources release particles continously. The trajectories of wood debris are represented in second scenario whereas plastic/polystyrene debris in third scenario. Furthermore, the field study and simulation output was analyzed to predict source(s) of the seasonal marine debris and the debris trajectory. It is proved that marine debris stranded at Kuta Beach Bali are more likely from Bali Island itself, especially from Badung and Tabanan area. <br />