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 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.
KeywordsHarbor siltation Tidal harbor North Port of Incheon Sedimentation rate Sediment core Dredging
Research technician, Soongji Lee, is acknowledged for his contribution during the field measurement and data compilation, and Wansang Ryu for the GIS analysis of bathymetric survey data. The reviewers are thanked for comments and discussion which improved the manuscript in general, and in particular the error analysis in estimating the sedimentation rate.
This research is supported by the Korea Hydrographic and Oceanographic Administration. Partial support was also given by the research project, “Construction of Ocean Research Station and Their Application Studies,” funded by the Ministry of Oceans and Fisheries, Korea. This research was also supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1D1A1B05033162).
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