Numerical Simulation of Hydrodynamic and Sediment Transport in the Madura Strait

Abstract

Surabaya serves as a coastal and economic center in East Java, where rapid coastal development around the
Madura Strait has intensified sedimentation and shoreline change. Understanding hydrodynamic behavior and sediment
transport is crucial for sustainable coastal management. This study applies a three-dimensional Delft3D numerical model to
simulate hydrodynamics and sediment transport in the Madura Strait. The model accounts for tides, waves, wind, river
discharge, temperature, salinity, and sediment properties to capture seasonal variations in circulation and sediment
dynamics. Model validation using tidal and current observations shows acceptable accuracy based on RMSE and MAE
values. Results indicate that tidal forcing predominantly controls current circulation, showing bidirectional flow with a
phase lag between flood and ebb tides, leading to net sediment transport toward the Pamurbaya convergence zone.
Significant wave heights (0.1–0.5 m) exhibit seasonal variation, increasing during the East Monsoon and the Second
Transitional Season due to easterly winds. Sediment transport simulations show minor morphological changes (–0.02 to
+0.02 m/year) but active redistribution, particularly near Pamurbaya. These findings highlight the dominant role of tidal
dynamics and the need for adaptive, morphodynamic-based coastal management to ensure the long-term stability of the
eastern Surabaya coastline.