CGRG Bibliography of Canadian Geomorphology
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Author : Davies, M.H.; and MacDonald, N.J.
Date : 2001.
Title : Sediment transport modelling environment for the St. Lawrence River.
Publication : Coastal Science and Engineering, challenge for the new Millennium. 2001 Canadian Coastal Conference. May 16-19 2001. Universite Laval. Pavillon La Laurentienne, Quebec, QC.
Issue :
Page(s) :
Abstract
Working in close collaboration with the Canadian Coast Guard - Laurentian Region and Environment Canada (Ste. Foy), the Canadian Hydraulics Centre is developing an interactive modelling environment for sediment processes in the St. Lawrence River. Both tidal and fluvial model results are imported into the simulation environment, SedSim where they can be animated and queried. The simulation environment, SedSim is a PC-based 3-D visualization environment that provides a standardized platform for the import and viewing of model results and GIS data within a common environment. Mapping tools have been developed which allow rapid, interactive querying of sediment mobility vectors and their residuals. These provide a remarkably clear picture of sediment pathways. This paper summarised the development, calibration and validation of a parcel-based sediment transport model, PSed, which operates within CHC's EnSim modelling environment. The development of this Lagrangian model has provided a fresh look at the kinematics of sediment transport and provided the opportunity to re-examine relationships for estimation of shear stress and sediment transport. The dispersion of sediments due to turbulent flow is modelled using a random-walk simulation modified to consider the effects of sediment mobility. The Lagrangian dispersion modelling is shown to be significantly more accurate that Eulerian techniques. Recent work has focussed on the inclusion of bank processes in SedSim. This has required the development of algorithms to estimate vessel drawdown and wake generation. SedSim has also been adapted to use the SWAN nearshore wave model to predict wind wave growth and transformation. The resulting hydrodynamics due to ship- and wind-wave processes are then evaluated in terms of the resulting sediment transport.
Bibliography of Canadian Geomorphology