Seasonal hydrodynamic pattern and effect of marine sediment distribution in Banten Bay

Abstract

This study aimed to see the pattern of current velocity and direction at the time of high tide, high tide, low tide, and lowest low tide during the west and east monsoons as well as to see an increase in sedimentation. Oceanographic and environmental baseline data used in this study consisted of bathymetry, tides, winds, waves, ocean currents, and sediment. The model used was DHI MIKE 21 Flow Model FM. Based on the calculation of determining the type of tide using the Formzahl formulation 1.54, the tides in the study area were classified as single dominant mixed tides. In the west season, the maximum current velocity was 0.112 m/s with the dominant current direction coming from the northeast to the southwest and approaching the coast. In the east season, the maximum current velocity was 0.112 m/s with the dominant current direction coming from the northeast to the southwest and approaching the coast. The highest concentration of suspended sediment in December was when the seawater conditions were nearing low tide. The highest concentration of suspended sediment was in the eastern part of Pier 3 at 1120 g/m3. The most significant change in bed level in December was at Pier 3 on the east side where the elevation increase was +0.30 m and the elevation decrease was -0.40 m. From the information regarding the location of the abrasion and sedimentation of the jetty development, it is possible to know in advance the anticipation of the dredging plan and the mitigation of coastal abrasion.