Hydrodynamics Analysis of Sanur Port Construction on the Sanur Beach Area

Coastal construction can alter the landscape. The port's construction at Sanur Beach has affected sediment deposition on the northern breakwater. Satellite data shows an accretion rate of 61.8 meters from 2021 to 2022. This research analyzes the influence of hydrodynamic factors on Sanur Beach before and after port construction. To ensure the accuracy of our findings, we employed a meticulous research methodology, using Flexible Mesh modeling with a Coupled model to understand the dynamics of the hydrodynamic factors that occur. It was found that the dominant winds arise in the east and southwest directions, with the most significant percentage being east winds, which cause current directions with dominant intensity from north to south. Simulations show that after the construction of Sanur Port, bed level changes will occur in the western season of 2022 in the form of an increase in the depth of the bottom of the waters with an average of 1.00-1.25 m and the east season 1.25-1.50 m. Before the construction of the port, changes in the bottom of the waters tended to be lower, with an average change of around 0.16-0.32 m in the east season and 0.05-0.30 m in the west season. The simulation results showed that Sanur Port's construction caused sediment accretion at its southern end and erosion at the northern end. This research is essential for coastal management, providing insights into the effects of port development on coastal dynamics.