Characterisation of alteration profiles using dynamic penetrometry with variable energy. Application to weathered black marls, Draix (Alpes-de-Haute-Provence, France). A dynamic penetrometer with variable energy has been tested in a gullied catchment of Callovo-Oxfordian black marls (Draix, Alpes-de-Haute-Provence, France). After calibration and validation, simple convenient geotechnical criteria allow to interpret penetrograms in terms of type and thickness of layers in the weathered marl profile, with a centimetric precision: (1) the loose detrital cover, (2) the more or less compact regolith laying on (3) the marl bedrock. Once calibrated for a specific environment, this new prospecting method appears very useful, rapid and efficient to characterise shallow superficial formations and estimate their volume. To cite this article: O.
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