Abstract
The dumping of dredge materials often raises concerns about the release of pollutants to the marine environment. Wind data from the Global Forecast System (GFS) model was used to simulate the wind-wave propagation from offshore in a two-dimensional (2D) model during September and October 2016. The calibration and validation of the 2D model showed a high conformity in both the phases and amplitude between the observed and simulated data. The 2D mud transport simulation results of three scenarios showed that the concentration of suspended material in the third scenario tested (scenario 3) was greater than 0.004 kg/m3 in the low tide, spreading to a 9 km2 area, and in the high tide, the concentration was 0.004 kg/m3 in a 6 km2 area. Finally, the results of 2D particle tracking (PT) showed changes in the seabed due to the concentration of dredged material, and its dump (approximately 180 days) increased from 0.08 m to 0.16 m in 2.85 ha. In scenario 3, the element block moved quite far—approximately 2.9 km—from the dredge position. Therefore, the simulation results were qualified, as the dredging position situated far from the sea is significantly affected by the direction and velocity of wave-wind in the dredging position.
Highlights
Dredging is a crucial activity, regularly carried out to maintain safe passage for boats and ships at ports and harbors [1,2,3,4,5,6]
An unstructured grid was established for the offshore zone with the maximum mesh size 3000 m and for the coastal area with the minimum mesh size 50 m (Figure 3b)
The dredging and maintenance of Quy Nhon Port play an important role in the transportation, evaluation and selection of dredging position and dredging volume
Summary
Dredging is a crucial activity, regularly carried out to maintain safe passage for boats and ships at ports and harbors [1,2,3,4,5,6]. The dredging and dumping of spoils at sea inevitably increase the turbidity levels and settlement of fine sediment over an extended area [9,10]. This can propagate to a large area around the dumped location [11,12,13,14,15,16,17,18]. As a result, dredging and its related activities should be monitored, controlled and their impacts on the marine environments should be evaluated [23]
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