MACRO AND MICROPLASTIC MASS PREDICTION AND MODELING THE DISTRIBUTION OF MICROPLASTIC CONCENTRATIONS IN THE JAKARTA’S BAY

• Main Author: Apriyanta Winardi, Edwin
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69141
• Institution: Institut Teknologi Bandung

The capital city, like Jakarta, is experiencing population growth. Population growth in an area is related to the amount of plastic production. Plastic waste that is not appropriately handled causes it to enter the marine environment. Furthermore, the dynamics in the oceans cause plastic waste to be degraded into smaller sizes and can be scattered in the waters. Microplastic research in Jakarta Bay was conducted using numerical modeling to predict the amount of microplastic mass and the distribution of microplastic concentrations in the sea. Plastic production in DKI Jakarta Province from 1950-2020 experienced a non-linear increase. The mass of macro and microplastics changed simultaneously, and the estimated plastic mass in 2010 and 2020 was 5,584.31 tons, 23.76 tons, 6,67.67 tons, and 33.87 tons. It is necessary to take preventive measures so that the mass of macro and microplastics in 2050 does not reach 9,869.38 tons and 72.24 tons. The constant waste input scenario predicts that the mass of plastics will decrease by 26.26% and 45.14% by 2050. The second and third scenarios conclude that preventive measures are needed to reduce the amount of plastic waste in the ocean and countermeasures for marine plastic waste to clean up the remaining plastic waste. A microplastic simulation for one month in 2019 showed that there were still microplastics in Jakarta Bay at the end of the simulation. The remaining microplastic concentration at the end of the simulation was 0.953-30.108%, with an average of 27.77% of the initial concentration and the remaining 72.22% spread out of Jakarta Bay. The distribution of microplastic concentrations follows the direction of ocean currents. In the western monsoon, microplastics spread eastwards towards the West Java Sea Waters, and most of the microplastics are stranded around the Bekasi Estuary to the Citarum River. Microplastics spread westward towards the Pari Island and Banten Waters in the eastern monsoon.