(Article of periodic en Anglais - 2012)

Document title

Mining soil databases for landscape-scale patterns in the abundance and size distribution of hillslope rock fragments

Authors(s) and Affiliation(s)

MARSHALL J.A. (1) ; SKLAR L.S. (1) ;
(1) Dep. of Geosciences, State Univ., San Francisco, ETATS-UNIS


The AA. explored the utility of soil survey databases for data mining, with the goals of identifying landscape-scale patterns in the abundance and size distribution of rock fragments (diameter D>2mm) and potential controls on grain size production. The AA. focus on data from 3 regions : the Hawaiian Islands, and the Sierra Nevada and Cascade Mountains, where elevation transects span a range of environmental conditions. They selected pedons from pits dug on hillslopes with active soil production and transport, constructed depth-averaged grain size distributions and calculated the mass fraction of rock fragments and the median rock fragment grain size. They also categorized as bimodal, size distributions with a clear ‘breakpoint’ between fine and coarse modes. Several strong patterns emerge from the data. Precipitation may influence many patterns in the data. These observations may be useful in refining models of coarse sediment supply to rivers, and suggest opportunities for future work to test mechanistic hypotheses for rock fragment production on soil-mantled hillslopes


Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2012, vol. 37, no3 [pp. 287-300]

Bibliographic references : 2 p.

Collation : 9 fig., 2 tabl.



INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2241

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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