Constitution de référentiels géochimiques locaux pour les sols et proches sous-sols urbains : de la base de données à l'interprétation géostatistique

Abstract : Large urban redevelopments generate large volumes of excavated soils whose reusability is now possible if they are compatible with the pedo-geochemical background of the receiving site. In order to facilitate this valorization, this thesis focuses on processing methodologies on data acquired for other purposes than the determination of the pedo-geochemical background, in order to provide a geochemical quality reference system for urban soils at the scale of one neighborhood or city. The first tests show the limits of the statistical stresholds, usually used with data dedicated to the pedo-geochemical background because of their sensitivity to the limit of quantification, to the distribution law or to the percentage of anomaly. The segmentation of the territory into coherent geographical entities based on the nature of the soil and subsoil and the anthropogenic pressures (current or past) allows the constitution of different geochemical background levels according to the geochemical quality of the soils, but one of the difficulties concerns the information of all entities. The statistical classification of the samples, even if spatialized, does not currently provide usable results for the management of the excavated earth. Lastly, geostatistical filtering via a linear model of coregionalisation provides a solid alternative for anomaly filtering and background estimation at a neighborhood scale.
Document type :
Theses
Complete list of metadatas

Cited literature [165 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/tel-02310465
Contributor : Abes Star <>
Submitted on : Thursday, October 10, 2019 - 11:07:10 AM
Last modification on : Monday, October 14, 2019 - 11:36:06 AM

File

2019PSLEM014_archivage.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02310465, version 1

Citation

Baptiste Sauvaget. Constitution de référentiels géochimiques locaux pour les sols et proches sous-sols urbains : de la base de données à l'interprétation géostatistique. Géochimie. PSL Research University, 2019. Français. ⟨NNT : 2019PSLEM014⟩. ⟨tel-02310465⟩

Share

Metrics

Record views

66

Files downloads

22