Title Page
Contents
Abstract 14
1. Introduction 15
2. Study area 16
3. Materials and methods 19
3.1. Mooring and data collection 19
3.2. Data analysis methods 23
3.2.1. Sediment flux decomposition and velocity asymmetry 23
3.2.2. Estimation of current-induced bed shear stress 26
4. Results 27
4.1. Meteorological forcings and hydrodynamics 27
4.2. The role of current in SSC variations 33
4.3. Along- and across-channel sediment fluxes 36
5. Discussion 39
5.1. Relative importance of local resuspension and advection 39
5.2. Driving mechanisms of suspended sediment flux 44
6. Conclusions 49
References 51
SUPPLEMENTARY MATERIALS 62
S1. Materials and methods 63
S1.1. Ship-borne survey 63
S1.2. ADCP data analysis 63
S2. Results 66
S2.1. Residual currents in TM01 and TM02 66
S2.2. Across-channel distribution of suspended sediment 68
S2.3. Local resuspension and advection of sediment 72
References 74
Figure 1. Map of the study area in Yeosu Bay. Two acoustic Doppler current profilers (ADCPs) were concurrently deployed at TM01 (blue triangle: 34°50'34.6"N,... 18
Figure 2. Particle size distribution of bed sediment sampled near stations (A) TM01 and (B) TM02. 22
Figure 3. Time series from the AWS: (A) wind velocity and (B) precipitation. Vertical profiles provided from CTD: (C) temperature, (D) salinity, and (E) density.... 30
Figure 4. Time series of (A, E) along-channel current velocity (u), (B, F) across-channel velocity (v), (C, G) tidal current velocity (u′), and (D, H) residual current... 31
Figure 5. Variability in near-bed velocity skewness (γ0u, solid line) and tidal current velocity skewness (γ0u′, dashed line). Blue solid line and sky-blue dashed line represent TM01. Red solid line and orange dashed line represent TM02,...[이미지참조] 32
Figure 6. Time series of (A, E) the SSC profiles, (B, F) instantaneous sediment fluxes, (C, G) the depth-integrated along-channel sediment fluxes, and (D, H)... 34
Figure 7. (A, B) Scatterplots of current-induced bed shear stress (τc) and SSC colored according to relative tidal range. Max and Min indicate relative tidal range over the tidal cycle, respectively. The SSC was measured at 2.5 mab (2nd bin).[이미지참조] 35
Figure 8. Time series of (A, D) instantaneous across-channel sediment fluxes, (B, E) the depth-integrated across-channel sediment fluxes, and (C, F) cumulative... 38
Figure 9. Power spectra of (A) water levels, (B) along-channel velocity (u), (C) across-channel velocity (v), and (D) SSC. Gray lines indicate a confidence interval of 95%. Vertical dashed lines indicate frequencies of semi-diurnal (12.42 h) and... 42
Figure 10. Scatterplots of u and v colored according to SSC during spring tides. The (A, C) squares and (B, D) circles represent the accelerated and decelerated flows, respectively. 43
Figure 11. SSC and u (magenta: surface velocities, black: bottom velocities) during the second spring tide in (A) TM01 and (B) TM02, respectively. (C) The... 48
Figure S1. Relationship between SSCv and echo intensity. 65
Figure S2. Progressive u-v current vector diagrams (September 3-October 2, 2021) at the two ADCP moorings: (A) TM01 and (B) TM02. The triangles indicate locations of ADCP mooring and the color of the lines indicates water depth (m). 67
Figure S3. The cross-channel distribution of the SSC BT during low tide. The view is looking landward. The period is 15:24-15:50 on September 7, 2021. 69
Figure S4. (A) Tidal elevation during the observation time on September 7, 2021.Volume concentration and Particle size in the (B, F) surface layer (〈 5 m),... 70
Figure S5. Depth profile of (A, C) chlorophyll and (B, D) turbidity in TM01 and TM02. The red triangle and dot lines indicate casting time. 71
Figure S6. Continuous Wavelet Transform (CWT) of (A, B) along-channel velocity (u) and (C, D) SSC. The 5% significance level for red noise is indicated... 73