Coastal Erosion

Coastal erosion is the gradual landward retreat of the shoreline caused by natural coastal processes, primarily the long-term action of waves and storm events. Continuous wave attack removes beach sediments over time, resulting in shoreline recession. In addition to natural processes, coastal erosion can also be accelerated by human activities, particularly sand mining, coastal reclamation, and other developments that disturb the natural sediment balance. These activities may cause rapid shoreline retreat and significantly increase the vulnerability of coastal areas.

The impacts of coastal erosion extend beyond environmental degradation. From a strategic perspective, erosion can reduce coastal land area, threaten public infrastructure, and alter administrative or territorial boundaries. Environmentally, it can result in the loss of valuable coastal habitats, degradation of ecosystems, increased sediment redistribution, and declining coastal resilience.

Numerical coastal modeling provides a reliable scientific approach for predicting shoreline evolution caused by natural erosion processes. Long-term simulations can evaluate the cumulative effects of waves, storms, and coastal hydrodynamics over periods of years or even decades. As wave energy continuously erodes coastal sediments, the removed material is transported and deposited elsewhere within the coastal system. Numerical models simulate this dynamic balance between erosion, sediment transport, and deposition, enabling accurate prediction of future shoreline changes under various environmental scenarios.

Hydrodynamic models are used to simulate coastal circulation and water level variations. Wave conditions and wave energy are evaluated using advanced wave models, including Spectral Wave Models, Shallow Water Spectral Wave Models, Parabolic Mild Slope Models, Elliptic Mild Slope Models, Wave Refraction–Diffraction Models, and Boussinesq Wave Models. Sediment transport is simulated using Bed-Load Sediment Transport, Suspended Sediment Transport, and Particle Tracking Models. Long-term shoreline evolution is then predicted using Coastal Morphology Models together with Littoral Processes and Shoreline Dynamics Models. Finally, simulation outputs are integrated with supporting spatial datasets using a Marine Geographic Information System (Marine GIS) to produce comprehensive maps and decision-support products for coastal management.