JEMS Maritime Sci. Ahead of Print: JEMS-06641

Investigation of the Dumping Dredged Material in the Offshore of Dung Quat Seaport, Vietnam

Nguyen Viet Thanh, Anh-Dan Nguyen
Faculty of Civil Engineering, University of Transport and Communications, Hanoi, Vietnam

To maintain navigational channels, ports routinely undertake dredging operations, resulting in significant volumes of sediment that must be properly disposed in offshore. This study evaluates the environmental impact of offshore dumping of dredged material in the offshore of Dung Quat Seaport, Vietnam. A coupled numerical model integrating hydrodynamics (MIKE 21 HD), wave (MIKE 21 SW), and sediment transport (MIKE 21 MT) modules was applied to simulate the dispersion of dredged materials over a 90-day disposal period involving a total volume of 540,000 m³. The model was calibrated and validated using field data, and Total Suspended Solids (TSS) concentrations were analyzed at various monitoring and coastal points. Results indicated that TSS levels remained below Vietnam’s regulatory threshold of 0.05 kg/m³, suggesting negligible impact on the surrounding marine and coastal environments. This study provides a scientific basis for environmentally sound dredged material management and disposal planning in Vietnam’s coastal waters

Keywords: Dredging Material, Dumping, Simulation, Sediment, Total Suspended Solids (TSS)

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