In the domain of coastal pollution mitigation, several technical facets are advancing our capabilities. One critical approach leverages bioremediation, where indigenous hydrocarbon-degrading bacteria are stimulated using added nutrients like nitrogen and phosphorus to remediate oil-contaminated beaches. The control of salinity intrusion is imperative, with simulations offering insights into the dynamics of saltwater infiltration in deep coastal aquifers, vital for managing freshwater resources in areas at risk. Advanced variably-saturated numerical models, grounded in Richard's equation, refine our comprehension of seepage faces in unconfined groundwater flows. This aids in precise groundwater resource management. Additionally, numerical simulations, such as those using Fluent, provide invaluable data on the velocity of waves breaking onshore, assisting in coastal engineering for sustainable coastal development and enhanced protection of these crucial ecosystems. These technical endeavors play a pivotal role in upholding cleaner and more resilient coastal environments.