Hydrodynamic Modeling of Tides Using Delft3D in the Coastal Area of Pangali–Ali, Majene Regency

Abstract

The waters surrounding Pangali–Ali Beach, located in Majene Regency, West Sulawesi Province, represent a coastal area that plays a strategic role in the local community’s social, economic, and ecological aspects. The relatively high level of fishing activity in this region makes tidal information an essential dataset to support sustainable coastal management and planning. This study aims to identify the hydrodynamic characteristics, particularly tides, at Pangali–Ali Beach as a basis for designing coastal protection structures. The research was conducted using numerical modeling with Delft3D, incorporating tidal data and bathymetric maps as input. Delft3D was selected due to its strong numerical performance and comprehensive features for simulating coastal and marine water dynamics. The simulation results for December 2021 indicate that the maximum sea level (highest tide) reached approximately 0.956 m, while the minimum sea level (lowest tide) ranged from 0.05 to 0.1 m. Based on the sea-level elevation analysis, the tidal pattern at Pangali–Ali Beach is classified as semi-diurnal, characterized by two high tides and two low tides within a day.