Field investigation of siltation at a tidal harbor: North Port of Incheon, Korea

To understand siltation processes within the North Port of Incheon, Korea, this study estimated the sedimentation rate and then determined the dominant mechanisms for the siltation. The sedimentation rate was estimated by comparing bathymetric surveys adjusted with the dredged volume, and verified b...

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Bibliographic Details
Published in:Ocean dynamics 2019-09, Vol.69 (9), p.1101-1120
Main Authors: Lee, Guan-hong, Shin, Hyun-Jung, Kim, Young Taeg, Dellapenna, Timothy M., Kim, Kuk Jin, Williams, Joshua, Kim, Seok-Yun, Figueroa, Steven Miguel
Format: Article
Language:English
Subjects:
Atmospheric Sciences
Bathymetric surveys
Bottom trawling
Current velocity
Dredging
Earth and Environmental Science
Earth Sciences
Eddy currents
Field investigations
Fluid- and Aerodynamics
Geophysics/Geodesy
Gravity
Harbors
Monitoring/Environmental Analysis
Oceanography
Penetration depth
Polls & surveys
Sediment
Sediment transport
Sedimentation
Sedimentation & deposition
Siltation
Topical Collection on the 14th International Conference on Cohesive Sediment Transport in Montevideo
Transport processes
Turbidity
Uruguay 13-17 November 2017
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Summary:To understand siltation processes within the North Port of Incheon, Korea, this study estimated the sedimentation rate and then determined the dominant mechanisms for the siltation. The sedimentation rate was estimated by comparing bathymetric surveys adjusted with the dredged volume, and verified by the penetration depth of 11 gravity cores to the previous dredging surface. The average sedimentation rate was 64 cm/year but varied from 10 cm/year in the interior to about 100 cm/year at the entrance. To determine the dominant mechanisms for siltation, two ADCPs were deployed at the entrance and the interior end of the harbor over a month to estimate sediment flux. Detailed sediment transport processes were examined by two 13-h CTD profiling surveys near the entrance and interior end of the harbor. High siltation at the entrance is attributable to the influx of high turbidity water, the decrease of current velocity, and the formation of an eddy. Low sedimentation inside the harbor was attained by the slow settling of microflocs of about 20–30 mg/l concentration that are maintained regardless of time and space.
ISSN:1616-7341
1616-7228
DOI:10.1007/s10236-019-01292-0