Sediment re-suspension and advection associated with residual flows in the Belgian coastal zone
Baeye, M. (2012). Sediment re-suspension and advection associated with residual flows in the Belgian coastal zone, in: Baeye, M. Hydro-meteorological influences on the behaviour and nature of sediment suspensions in the Belgian-Dutch coastal zone = Hydro-meteorologische effecten op het gedrag en samenstelling van sedimentsuspensies in de Belgisch-Nederlandse kustzone. pp. 69-88
In: Baeye, M. (2012). Hydro-meteorological influences on the behaviour and nature of sediment suspensions in the Belgian-Dutch coastal zone = Hydro-meteorologische effecten op het gedrag en samenstelling van sedimentsuspensies in de Belgisch-Nederlandse kustzone. PhD Thesis. Ghent University: Ghent. 170 pp., meer
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| Trefwoord |
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| Author keywords |
SPM Fluxes; bottom-ADCP; benthic tripod; vertical mixing |
| Abstract |
Residual (e.g. wind-driven) sediment fluxes have been studied using a combination of in-situ bottom-mounted sensors (ADCP, tripod) allowing measuring over the entire water column. Flow profiles, SPM concentration and near-bed sediment dynamics are discussed, and a vertical mixing parameter is introduced in order to evaluate when suspended sediments are well-mixed in the water column. The northeast-directed flow regime exhibits strong hydrodynamics, resulting in a good mixing. Although the southwest-directed regime is also characterized by a good mixing, there is no real link with bed shear stresses (hydrodynamics). Therefore, it is suggested that the nature of particles in suspension also must be regarded. The finer, soft (cohesive) sediments are likely to be suspended more or longer compared to the more sandy sediments, which will settle more easily. These results allowed a separation and recognition of processes that control the variability of SPM concentration and that can be used as an attempt for understanding the long-term evolution of the system. |
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