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Effect of bottom stress formulation on modelled flow and turbidity maxima in cross-sections of tide-dominated estuaries
| Content Provider | Paperity |
|---|---|
| Author | Schuttelaars, Henk M. Schramkowski, George P. Huib, E. De Swart |
| Abstract | A three-dimensional numerical model with a prognostic salinity field is used to investigate the effect of a partial slip bottom boundary condition on lateral flow and sediment distribution in a transect of a tidally dominated channel. The transect has a symmetrical Gaussian cross-channel bottom profile. For a deep, well-mixed, tidally dominated channel, partial slip decreases the relative importance of Coriolis deflection on the generation of cross-channel flow patterns. This has profound implications for the lateral distribution of residual salinity that drives the cross-channel residual circulation pattern. Transverse sediment transport, however, is always found to be governed by a balance between advection of residual sediment concentration by residual lateral flow on the one hand and cross-channel diffusion on the other hand. Hence, the changes in the cross-channel distribution of residual salinity modify the lateral sediment distribution. For no slip, a single turbidity maximum occurs. In contrast, partial slip gives a gradual transition to a symmetrical density distribution with a turbidity maximum near each bank. For a more shallow, partially mixed tidal channel that represents the James River, a single turbidity maximum at the left bank is found irrespective of the near-bed slip condition. In this case, semi-diurnal contributions to sediment distribution and lateral flow play an important role in cross-channel sediment transport. As vertical viscosity and diffusivity are increased, a second maximum at the right bank again exists for partial slip. |
| Starting Page | 205 |
| Ending Page | 218 |
| File Format | HTM / HTML |
| ISSN | 16167341 |
| DOI | 10.1007/s10236-009-0235-0 |
| Issue Number | 2 |
| Journal | Ocean Dynamics |
| Volume Number | 60 |
| e-ISSN | 16167228 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2010-04-01 |
| Access Restriction | Open |
| Subject Keyword | Morphodynamic equilibrium Estuary Turbidity Sediment transport |
| Content Type | Text |
| Resource Type | Article |
| Subject | Oceanography |
