Factorial Kriging Analysis as a tool for explaining the complex spatial distribution of metals in sediments

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Environmental Science & Technology, 44 (2), pages 593–599
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Partie inférieure de la rivière Scarpe, Nord-Pas-de-Calais
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Characterizing the spatial distribution of pollutants in sediments is of high importance for selecting a suitable remediation operation, but is a complex task because this spatial variability is the result of various physical and chemical mechanisms occurring at different scales. FKA applied to Cd and Zn concentrations in sediments of the Scarpe river proved to be effective, allowing their mapping to be decomposed in a first map related to a short- range spatial correlation corresponding to hot spots interpreted as the impact of industrial and urban inputs located along the canal, and a second map related to a long-range spatial variability associated with long pollutant plumes interpreted as the effect of one major upstream pollutant input.

Factorial kriging analysis appears to be useful to support hypotheses about transport and sedimentation modalities of pollutants, regarding the type and location of the discharges and taking into account the influence of the morphology of the stream (meander, enlargement). Factorial kriging analysis was not suitable to all of polluants. The origin and/or the specific physicochemical properties of these pollutants will be scrutinized in future studies regarding their unexpected response to the FKA possibly linked to a particular behavior in the aquatic environment.
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