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Variations in soil dispersivity across a gully head displaying shallow sub-surface pipes, and the role of shallow pipes in rill initiation

Soil surface characteristics : dynamics and impact on soil erosion. Special issue

Auteurs :
FAULKNER, H.
ALEXANDER, R.
TEEUW, R.
ZUKOWSKYJ, P.
AUZET,

Description :
A small bifurcating gully head displaying shallow pipe development was surveyed to explore how far three-dimensional patterns of geochemistry and sediment size can be related to hydraulic gradients in the local marl bedrock (Almeria, SE Spain). It is concluded that calcium replaces sodium in the crust during leaching, leaving a calcic crust, and a sub-crust that is sodic and prone to subsequent pipe enlargement. Rill morphology in these materials also suggests that rills develop from these pipes when pipe roofs collapse.


Type de document :
Article de monographie

Source :
Earth surface processes and landforms, issn : 0197-9337, 2004, vol. 29, n°. 9, p. 1143-1160, nombre de pages : 18, Collation : Illustration, Références bibliographiques : 35 ref.

Date :
2004

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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