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Down-slope change in soil hydrogeochemistry due to seasonal water table rise : Implications for groundwater weathering

Auteur(s) et Affiliation(s)

BESTLAND, E.A.
School of the Environment, Flinders Univ., Adelaide, Australie
STAINER, G.
Dept. of Agriculture and Food, WA, Western Australia, Merredin, Australie


Description :
With the goal of better understanding where weathering is occurring, a toposequence of 5 soil/regolith profiles from ridge crest to valley bottom in the Mt Lofty Range, Scott Creek area of South Australia, was investigated using whole soil geochemistry, soil exchange pool and soil pore water hydrochemistry; stream water and groundwater hydrochemistry were analysed as well. This investigation aimed to: 1) trace water through soils, into the groundwater, and to the stream; and 2) investigate soil and regolith weathering hydrochemistry. Strontium isotope analysis of the groundwater, stream water, soil pore water, and soil exchange pool has established that the stream water is a mix of soil water and groundwater. This mix varies seasonally due to large changes in soil water input. The weathering is thought to be concentrated in the vadose zone at the transition between bedrock and saprolite.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2013, vol. 111, p. 122-131, nombre de pages : 10, Références bibliographiques : 1 p.

Date :
2013

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais
Droits :
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