MODELING OF MARINE DEBRIS TRACE FROM THE WATERS OF MANADO BAY

• Main Author: Dyan Yohanlis, Aulia
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50411
• Institution: Institut Teknologi Bandung

According to World Bank research (2018), Manado has no debris net in each of its river estuaries. So that debris can easily be carried away by the current to the tourism area around the Bay of Manado. The purpose of this study was to determine the movement of floating debris originating from Manado Bay using numerical modeling. In this research, the current conditions and the direction of distribution of debris have been studied using 2D hydrodynamic model simulations in DELFT3D software. Model simulations are carried out in 4 seasons in one year, namely during the east season, transition 1, west, and transition 2, which are represented by July, October, January and April respectively. Based on the verification results, the model has a good performance in modeling tidal conditions in the study area with an RMSE of 0.06 meters and a MAPE of 2.86%. From the simulation of current conditions, the results shows that the effect of the addition of wind and changes in bathymetry affects the amount of wind speed and turns the wind direction about 30-45 from the original direction (without wind). From the modeling of current conditions, it is found that during the east monsoon, the current generally moves from the northeast to the southwest with an average speed of 0.011 m/s. In transitional season 1, the current originates from the southeast to the northwest with an average speed of 0.013 m/s. During the west monsoon, currents generally originate from the southwest to the east with an average speed of 0.015 m/s. Meanwhile, during the transition season 2, the current moves from west to east with an average speed of 0.019 m/s. In this modeling, the waste particles can come out of the bay in the eastern season, while in other seasons the garbage only collects in the bay. The tourist area that is at risk of receiving waste from Manado Bay is Bulo Beach in the eastern season. Assuming there is no source of waste from the area, the percentage of waste particles that can reach the area is 16%.