Abstract:Theoretical and experimental studies were undertaken to gain insight into physical parameters controlling the flocculation and settling properties of mud flocs in the Changjiang Estuary, China. The Rouse equation is applied to vertical profiles of suspended sediment concentration to determine the bulk mean settling velocity (w s ) of sediment suspended in the Changjiang Estuary. Both in situ point-sampled and acoustically measured profiles of suspended mud concentrations were fit selectively. The calculated settling velocities w s mainly ranged from 0Ð4 to 4Ð1 mm s
Tidal flow and fine-sediment transport at the South Channel-North Passage of the partially-mixed Changjiang River estuary were studied using a twodimensional horizontal (2DH) numerical model. This 2DH model was achieved by depth-integrating the momentum and convection-diffusion equations. The Alternating Direction Implicit scheme was used to solve the governing equations. The iterative method was adopted for the calculation of convection and diffusion terms of momentum equation. Comparisons between calculated and measured results (tidal elevations and depth-averaged velocities) have shown reasonable agreement. Horizontal distributions of tidal current velocity and suspended sediment concentration were qualitatively consistent with observations. Those modeled results were analyzed to elucidate the mechanisms for the formation of the turbidity maximum and intratidal variations in fine-sediment transport processes.
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