Hydrodynamic and Sediment Dynamics Study in the Coastal Area of Dobo Ferry Port, Aru Islands Regency, Indonesia | ||
| Egyptian Journal of Aquatic Biology and Fisheries | ||
| Volume 29, Issue 5, September and October 2025, Pages 1387-1410 PDF (2.04 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2025.423480.6571 | ||
| Authors | ||
| Pieter Th Berhitu* ; Aryanto Boreel; Elma Fitriyani Laitupa | ||
| Department of Urban and Regional Planning, Faculty of Engineering, Pattimura University, Ambon - Indonesia | ||
| Abstract | ||
| Siltation in berth basins has become a major operational issue at the Dobo Ferry Port, Aru Islands Regency. This study aimed to analyze the hydrodynamic factors influencing sedimentation processes in the port basin and to propose effective mitigation strategies. Field surveys were conducted in July 2025, including topographic and bathymetric mapping, tidal observation, current and wave measurements, as well as sediment sampling. Data were analyzed using oceanographic survey techniques, numerical modeling, and laboratory analysis of sediment composition. The results revealed that tidal regimes in Dobo waters are of a mixed type predominantly semidiurnal, with an average tidal range of 94.1cm. This tidal condition strongly influences sediment transport into the berth basin. Significant wave heights during the southeast monsoon (1.2– 1.5m) contributed to sediment resuspension in shallow waters, while asymmetric tidal currents facilitated the trapping of fine-grained material inside the basin. Laboratory analysis indicated that silt and clay fractions dominated the sediments, accounting for more than 60% of the total composition. Numerical simulations showed that within a 15-day tidal cycle, sediment deposition reached 0.01– 0.07m in the old jetty and planned jetty areas. These findings suggest that siltation at Dobo Ferry Port is driven by a combination of hydrodynamic processes, sediment supply from terrestrial inputs, and anthropogenic activities in coastal settlements. Mitigation strategies should therefore integrate adaptive dredging practices, hydrodynamic engineering, ecological restoration of mangroves and seagrass beds, and the implementation of technology-based sediment monitoring systems. This integrated approach is expected to enhance the sustainability of port operations and maintain inter-island connectivity in the Aru Archipelago. | ||
| Keywords | ||
| Sedimentation; Hydrodynamics; Ferry Port; Bathymetry; Aru Islands | ||
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