Author(s): H. K. Ha; S. I. Kim; J. Y. Seo; J. H. Park; P. J. Kim
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Keywords: No Keywords
Abstract: In the western (M1) and eastern (M2) channels of Yeosu Bay, two mooring systems with acoustic Doppler current profilers were installed to investigate the transport processes of suspended sediments. Over the mooring period, the currents (M1: -1.10–0.80 m s–1; M2: -0.85–0.85 m s–1) were mainly dominated by ebb tides. Two-layered residual currents developed by the freshwater discharge at M2 (< 0.24 m s–1) were higher than that at M1 (< 0.16 m s–1). Even if the same current-induced shear stress as M2 was applied to the bed, M1 could be resuspended with higher SSC (max: 233 mg l–1) to reach the water surface. This is because the bed sediments at M1 have relatively low cohesive sediment (mud) content and shell fragments. These differences in current and sediment resuspension created an unbalanced sediment flux. The seaward sediment flux at M1 was mainly driven by tidal pumping, whereas the landward flux at M2 was mainly driven by residual currents. Although the sediment fluxes tended to be compensated and balanced mutually by tidal cycles over the entire period, the sediment flux at M2 was about twice higher than that at M1. Suspended sediments exhibited an influx pattern into the bay.
Year: 2024