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MAPPING SOIL THICKNESS ON HETEROGENEOUS BEDROCK USING ELECTRIC AND ELECTROMAGNETIC SURVEY

January 2011

January 2011

In book: Milieux poreux et transferts hydriques
Editors: GFHN

Authors:

Florent Hinschberger

University of Tours

Hocine Bourennane

French National Institute for Agriculture, Food, and Environment (INRAE)

Caroline Chartin

Walloon Agricultural Research Centre CRA-W

S. Salvador-Blanes

University of Tours

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Owing to the automation of the measurements, geophysics is now commonly used to predict soil thickness over large areas in addition to punctual information given by soil augering. Among the various geophysical tools, the methods based on electrical resistivity measurements give good results providing that the bedrock is homogeneous. In this study we use electric and electromagnetic methods to map soil thickness over an area with heterogeneous bedrock. Geostatistical analysis allows eliminating the bedrock variability influence. The most efficient predictions are obtained when integrating topographic slope to the resistivity data.

Carte de résistivité EM31 de l'ensemble du site d'étude montrant les différents substrats, la zone-test et le transect de sondages électriques

a) Corrélations entre la résistivité électrique (ARP) et l'épaisseur de sol sur le tuffeau jaune ; (b) corrélation entre l'épaisseur de sol mesurée et l'épaisseur de sol prédite par le modèle sur l'ensemble de la zone test; (c) idem (b) en ajoutant la pente topographique comme variable auxiliaire

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