Physical weathering and regolith behaviour in a high erosion rate badland area at the Pyrenees: research design and first results

D. Regües; P. Llorens; G. Pardini; R. Pini; F. Gallart

doi:10.3989/pirineos.1993.v141-142.164

Physical weathering and regolith behaviour in a high erosion rate badland area at the Pyrenees: research design and first results

Authors

D. Regües Institut de Ciències de la Terra "Jaume Almera" (C.S.I.C)
P. Llorens Institut de Ciències de la Terra "Jaume Almera" (C.S.I.C)
G. Pardini Institut de Ciències de la Terra "Jaume Almera" (C.S.I.C)
R. Pini Istituto per la Chimica del Terreno (C.N.R.)
F. Gallart Institut de Ciències de la Terra "Jaume Almera" (C.S.I.C)

DOI:

https://doi.org/10.3989/pirineos.1993.v141-142.164

Keywords:

Badiand, weathering, bulk density, soil temperature, soil moisture, swelling frost heaving

Abstract

Previous studies on badland areas in the Vallcebre basin (High Llobregat) suggested that the erosion rates are controlled by weathering rate of mudrocks. The present work was started to characterize the physical weathering processes and rates in relationship with thermal and moisture conditions.
The method used consists of the continuous monitoring of regolith temperatures at different conditions of aspect, depth and lithology (color), and the periodical sampling of regolith moisture and bulk density, the last taken as an indicator of the weathering status. Besides this quantitative information, the changes of the surface of the regolith have been monitored with the help of photographic techniques, using a especially designed tripod. To complete the field observations, a laboratory experiment is being performed, analyzing the volumetric changes suffered by undisturbed rock samples subject to thermal and moisture oscillations.
The results obtained emphasize the role of frost action, especially during wet conditions. Aspect and lithologic differences introduce significant nuances in thermal regime and volumetric changes respectively.

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Published

1993-12-30

How to Cite

Regües, D., Llorens, P., Pardini, G., Pini, R., & Gallart, F. (1993). Physical weathering and regolith behaviour in a high erosion rate badland area at the Pyrenees: research design and first results. Pirineos, 141-142, 63–84. https://doi.org/10.3989/pirineos.1993.v141-142.164

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Issue

Vol. 141-142 (1993)

Section

Articles

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