LeHavreV1, France, Analysis, bibRecord, 000B50

Modelling sand/mud transport and morphodynamics in the Seine river mouth (France) : an attempt using a process-based approach

Identifieur interne : 000B50 ( France/Analysis ); précédent : 000B49; suivant : 000B51

Modelling sand/mud transport and morphodynamics in the Seine river mouth (France) : an attempt using a process-based approach

Auteurs : B. Waeles [France] ; P. Le Hir [France] ; P. Lesueur [France] ; N. Delsinne [France]

Source :

Hydrobiologia : (The Hague) [ 0018-8158 ] ; 2007.

RBID : Pascal:07-0428936

Descripteurs français

Pascal (Inist)
- Modélisation, Sable, Vase, Boue, Transport, France, Sédiment, Hydrobiologie, Milieu aquatique, Rivière Seine.
Wicri :
- geographic : France.
- topic : Milieu aquatique.

English descriptors

KwdEn :
- Aquatic environment, France, Hydrobiology, Modeling, Mud, Ooze, Sand, Sediments, Seine River, Transport.

Abstract

The mouth of the Seine River estuary (France) has undergone marked morphological evolution over several decades mainly due to engineering works aimed at improving access to Rouen and Le Havre harbours. The intertidal areas are decreasing in size and the lower estuary is accumulating sediment and prograding. In order to understand and better describe the major morphological behaviours of the estuary, a morphodynamic numerical model was developed within the Seine-Aval program. At the end of the 1st part of the research program, a validated fine sediment transport model (3D) was available (Le Hir et al., 2001b). As the present morphological study addresses medium-term issues (a few decades), and because of the need to investigate impacts of local structures or events, we chose to use the so-called "process-based approach" starting from the existing model. First, the existing model was upgraded to account for (suspended) sand transport, and to achieve coupling between morphological changes and sediment transport. Erodability of the sediment accounts for the respective proportions of mud and sand. Simulations starting from an arbitrary surficial sediment cover show that the model is able to reproduce realistic sediment patterns. For example, it is able to change the sediment nature on the intertidal flat near Le Havre from sand to mud. Observed structures of suspended sediment are also reproduced: fine particles mainly follow the turbidity maximum whereas significant concentrations of sand grains in suspension are found where the hydrodynamic stresses are intense. Concerning morphodynamics, simulations with real forcing over one year are discussed. The effect of waves on the bathymetric evolution of the mouth is shown and the sensitivity of morphodynamics to the coupling procedure is tested.

Affiliations:

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Pascal:07-0428936

Le document en format XML

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<front><div type="abstract" xml:lang="en">The mouth of the Seine River estuary (France) has undergone marked morphological evolution over several decades mainly due to engineering works aimed at improving access to Rouen and Le Havre harbours. The intertidal areas are decreasing in size and the lower estuary is accumulating sediment and prograding. In order to understand and better describe the major morphological behaviours of the estuary, a morphodynamic numerical model was developed within the Seine-Aval program. At the end of the 1st part of the research program, a validated fine sediment transport model (3D) was available (Le Hir et al., 2001b). As the present morphological study addresses medium-term issues (a few decades), and because of the need to investigate impacts of local structures or events, we chose to use the so-called "process-based approach" starting from the existing model. First, the existing model was upgraded to account for (suspended) sand transport, and to achieve coupling between morphological changes and sediment transport. Erodability of the sediment accounts for the respective proportions of mud and sand. Simulations starting from an arbitrary surficial sediment cover show that the model is able to reproduce realistic sediment patterns. For example, it is able to change the sediment nature on the intertidal flat near Le Havre from sand to mud. Observed structures of suspended sediment are also reproduced: fine particles mainly follow the turbidity maximum whereas significant concentrations of sand grains in suspension are found where the hydrodynamic stresses are intense. Concerning morphodynamics, simulations with real forcing over one year are discussed. The effect of waves on the bathymetric evolution of the mouth is shown and the sensitivity of morphodynamics to the coupling procedure is tested.</div>
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Modelling sand/mud transport and morphodynamics in the Seine river mouth (France) : an attempt using a process-based approach

Modelling sand/mud transport and morphodynamics in the Seine river mouth (France) : an attempt using a process-based approach

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri