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Multiclass sedimentary dynamic: from the analysis of processes to modeling in the Manche

Olivier BLANPAIN, doctorate of University of Rouen, 396 p., defended on the 16th october 2009

Document type > *Mémoire/HDR/Thesis

Keywords > Channel, mine-by-test

Research Unit > IRSN/DEI/SECRE/LRC

Authors > BLANPAIN Olivier

Publication Date > 16/10/2009

Summary

The purpose of this work is the implementation of a sediment transport model in the English Channel.  The  design  of  such  a model  requires  the  identification  of  the  physical  processes, their modelling and their in-situ validation. Because of the sedimentary particularities of the study area, modelling of the mechanical behaviour of a non uniform mixture of sediments and particularly  of  the  fine  grains  within  a  coarse matrix  is  required.  This  study  focused  on  the characterization of the relevant processes by acquisition of experimental and in-situ data.
Data  acquired  in  hydro-sedimentary  conditions  comparable  to  those  found  in  the  English Channel  are  scarce.  A  new  instrument  and  image  processing  technique  were  specifically conceived and implemented in-situ to observe and measure, with a high temporal resolution, the dynamics of a strongly heterogeneous mixture of particles in a grain-size scale. The data collected  compared  well  with  several  existing  formulations.  One  of  these  formulations  was chosen to be adapted. The transfer dynamics of fine grains in coarse sediments and their depth of penetration were acquired from stratigraphic samples. 
The sediment  transport model deals with multisize grains and multi sedimentary  layers,  it  is forced by swell and currents, and accounts for beadload and suspended load transports. It was applied to realistic scenarios for the English Channel.

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Pascal Bailly du Bois, the thesis co-director

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Thesis report


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