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Caractérisation géostatistique de pollutions industrielles de sols: cas des hydrocarbures aromatiques polycycliques sur d'anciens sites de cokeries

Abstract : Estimating polycyclic aromatic hydrocarbons concentrations in soil at former industrial sites poses several practical problems on account of the properties of the contaminants and the history of site : - collection and preparation of samples from highly heterogeneous material, - high short scale variability, particularly in presence of backfill, - highly contrasted grades making the variogram inference complicated. The sampling strategy generally adopted for contamined sites is based on the historical information. Systema- tic sampling recommended for geostatistical estimation is often considered to be excessive and unnecessary. Two former coking plants are used as test cases for comparing several geostatistical methods for esti- mating (i) in situ concentrations and (ii) the probability that they are above a pollution threshold. Several practical and methodological questions are considered : - the properties of various estimators of the experimental variogram and the validity of the results ; - the use of soft data, such as historical information, organoleptical observations and semi-quantitative methods, with a view to improve the precision of the estimates ; - the comparison of standard sampling strategies, taking into account vertical repartition of grades and the history of the site. Multiple analyses of the same sample give an approximation of the sampling error. Short scale sampling shows the difficulty of selecting soils in the absence of a spatial structure. Sensitivity studies are carried out to assess how densely sampled soft data can improve estimates. By using mainly existing models, this work aims at giving practical recommendations for the characte- rization of soil pollution.
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https://pastel.archives-ouvertes.fr/pastel-00001233
Contributor : Ecole Mines Paristech <>
Submitted on : Monday, May 30, 2005 - 8:00:00 AM
Last modification on : Tuesday, September 29, 2015 - 10:32:45 AM
Document(s) archivé(s) le : Thursday, September 30, 2010 - 6:45:22 PM

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Nicolas Jeannée. Caractérisation géostatistique de pollutions industrielles de sols: cas des hydrocarbures aromatiques polycycliques sur d'anciens sites de cokeries. Sciences of the Universe [physics]. École Nationale Supérieure des Mines de Paris, 2001. English. ⟨pastel-00001233⟩

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