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Bulletin de la Societe Geologique de France; March 2006; v. 177; no. 2; p. 89-95; DOI: 10.2113/gssgfbull.177.2.89
© 2006 Societe Geologique de France
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A spatial interpolation method of granulometric properties of superficial sediments

Alain Lepretre1, Georges Chapalain2 and Patrice Carpentier1

1 UPRES EA 3570, Lab. d’Ecologie Numérique & Ecotoxicologie & FR-CNRS 1818, Université des Sciences & Technologies de Lille, Bâtiment SN3, 59655 Villeneuve d’Ascq, France. Alain.Lepretre{at}univ-lille1.fr
2 UMR-CNRS 8110, Processus & Bilans en Domaines Sédimentaires & FR-CNRS 1818, Université des Sciences & Technologies de Lille, Bâtiment SN5, 59655 Villeneuve d’Ascq, France.

The present paper deals with the estimate and the mapping of granulometric characteristics (i.e. grain-size distributions and statistical parameters) of superficial sediments. A spatial interpolation method based on use of a spherical factor analysis (SFA) and a kriging procedure is proposed. Applied to a set of data collected in the bay of Wissant (straits of Dover), this mixed SFA and kriging method proves to be much more efficient than a direct kriging method for reproducing the complex typology of a statistical parameter such as the median. Beyond cartographical uses, this new interpolation method should be helpful (1) to investigate the time-evolution of a sedimentary cover subject to a time-varying sampling plan and (2) to estimate granulometric characteristics, especially the grain-size distributions, at the grid points of a numerical model for hydrodynamics and multicomponents sediment transport.

Key Words: Cartography • Sediments • Multivariate analysis • Kriging • Straits of Dover






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