Mots-clés
Action biogène Afrique du Sud Free State Golden Gate Highlands National Park Grès Géophysique Humidité Météorisation Taffoni Température Tomographie de résistivité électrique Biogenic process Electrical resistivity tomography Free State Geophysics Moisture Sandstone South Africa Taffoni Temperature Weathering Acción biógena Estado Libre de Orange Geofísica Granizo Humedad Meteorización Taffoni Temperatura África del SurInvestigations into the relationship between changes in internal moisture regimes and rock surface deterioration in cavernous sandstone features
Auteur(s) et Affiliation(s)
MOL, L.
School of Geography and the Environment, Univ., Oxford, Royaume-Uni
Description :
In this study the role of internal moisture movement is tested through monitoring moisture and surface deterioration dynamics in April 2008 and April 2009 within 2 large cavernous features (mega-tafoni) in the Golden Gate Highlands National Park, South Africa (GGHNP). Data are presented from surveys of internal moisture (using electrical resistivity tomography, ERT), surface moisture (using a Protimeter) and deterioration (using surface hardness as recorded with an Equotip as a proxy for surface deterioration) across 5 transects. In addition a high resolution temperature record is presented to assess the influence of micro-climates within the caverns. The presence of well-established biofilms suggests an even more complex interaction between moisture, surface development and biological activity. A model is presented therefore which integrates this paradox by proposing a non-linear relationship between moisture dynamics, facilitation of biofilm formation, and deterioration within cavernous features.
Type de document :
Article de périodique
Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 7, p. 914-927, nombre de pages : 14, Références bibliographiques : 1 p.
Date :
2014
Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)