Analysis of Wave and Tidal Characteristics after Marine Sand Mining Using MIKE-21 Modeling: A Case in North Galesong Takalar, Indonesia

The management of marine sand mining contributes positively to infrastructure development but can also negatively impact oceanographic parameters and marine ecosystems. This study aims to describe the profile of waves and tides after sea sand mining in Bone Malonjo waters, North Galesong District, Takalar. The research method is tidal and wave data collection. Wave Numerical Modeling was conducted using the DHI-Mike 21 software, specifically the Boussinesq Wave (BW) module. The required input data is bathymetric data in the x, y, and z format and water level elevation data based on the tides. The tidal type at the sea sand mining site is mixed tide prevailing semi-diurnal. The MIKE-21 modeling results describe wave conditions in the west monsoon in the existing condition before mining at an interval of 2.4 – 2.6 meters. The results show that the data did not change significantly after mining.

In comparison, the MIKE-21 modeling results describe the wave height in the east monsoon as lower than in the west. The wave height in the existing condition before mining was 2.1 – 2.5 m, which did not significantly change after sea sand mining. The results of this study assure the fishermen's community that there is no significant change in wave height at the sand mining location.