THREE-DIMENSIONAL NUMERICAL MODELLING OF TIDAL CURRENT IN BALIKPAPAN BAY USING DELFT3D

• Main Author: Fauzah, Syarifah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/52109
• Institution: Institut Teknologi Bandung

Balikpapan is one of the main port cities which has residential areas, industry, trade, and vital objects scattered from north to south along the coast of Balikpapan Bay. This dense activity increases traffic in Balikpapan Bay so the hydrodynamic conditions in these waters are important to be reviewed. The purpose of this research is to simulate hydrodynamics in Balikpapan Bay, East Kalimantan with tidal forces and river discharge. Bottom current analysis, bed shear stress, as well as cophase and corange were also conducted. The simulation results of the hydrodynamic model for sea level elevation values are close to the conditions in the field, as indicated by the correlation coefficient 0.98; skill 0.99; and RMSE 0.15 m. The current verification includes the average of correlation for x-direction and y-direction, 0.93; RMSE 0.05 m; and the percentage error 6.7%. The significant flow velocity is at low tide during spring tide with an average current velocity in the model domain of 0.1 m/s and a top speed of 1.62 m/s in the narrow gap upstream of the bay. Temporarily, the observation point at the mouth of Balikpapan Bay has the most significant BSS magnitude value with an average of 0.05 N/m2. Spatially, the highest BSS magnitude value is at the time of spring tide when it recedes towards the tide with an average BSS in the bay of 0.16 N/m2. The most dominant tidal components are M2 and S2, with a contribution value of 65.3%. The phase propagation from mouth to upstream of Balikpapan Bay for M2 component in Balikpapan Bay is 10.5° (22.77 minutes) and 5.5° (11 minutes) for S2 component.