DISTRIBUTION OF MARINE WASTE IN JAKARTA BAY TO THOUSAND ISLANDS THROUGH THE APPROACH OF 3 DIMENSIONAL HYDRODYNAMIC AND TRAJECTORY MODELS

• Main Author: Riza, Muhammad
• Format: Theses
• Language: Indonesia
• Subjects: Ilmu kebumian
• Online Access: https://digilib.itb.ac.id/gdl/view/64928
• Institution: Institut Teknologi Bandung

In the Jakarta Bay, there are estuarine of 13 rivers originating from Jakarta, Banten and Bekasi. These rivers are indicated as the source of the spread of marine waste originating from the mainland. In addition, in the north of Jakarta Bay there is the Thousand Islands which is often affected by marine waste pollution. For this reason, this study aims to estimate the source and amount of plastic waste stranded in the Thousand Islands during 2018 using 3-dimensional hydrodynamic modeling and trajectories. The method used in this study is Regional Ocean Modeling System (ROMS) hydrodynamics model. The correlation value of elevation obtained at Sunda Kelapa Station, Jakarta Bay between model results and tidal observation data from the Geospatial Information Agency (BIG) is 95.03% with a Root Mean Square Error (RMSE) of 9.1 cm. The monthly average of sea surface currents leading eastnortheast in January and February 2018, with a maximum speed occurring in January of 0.32 m/s. The monthly average of sea surface currents begins to change direction in March to the north with an average speed of 0.26 m/s. During the east monsoon the monthly average flows west, with an average velocity of 0.27 m/s, whereas in the west monsoon the surface flows return to the west-northwest with an average speed of 0.25 m/s. From the results of the trajectory model, the information obtained is that the most plastic waste stranded on Pramuka Island occurred in 2018 from Cengkareng River, with an amount of 4 tons. Plastic waste that stranded on Pari Island occurred mostly in November totaling 4.2 tons, estimated to originate from the Cisadane River, West Flood Canal, Muara Angke, Cakung, Blencong, East Flood Canal, Cikarang, Keramat, and Citarum. There has been a decrease in the amount of plastic waste in the Thousand Islands, starting from Bidadari Island to Pramuka Island (to the north) with the dominating number of stranded plastic waste coming from the Cengkareng River.