Mots-clés
Années 1969-2012 ; Couverture végétale ; Domaine aride ; Dune ; Désert ; Eolien ; Erosion éolienne ; Gobabeb ; Géomorphodynamique ; Namibie ; Précipitation ; Transport éolien ; VentAeolian features ; Aeolian transport ; Arid area ; Desert ; Dune ; Earth surface processes ; Namibia ; Plant cover ; Precipitation ; Wind ; Wind erosionCampo árido ; Cobertura vegetal ; Desierto ; Duna ; Erosión eólica ; Eólico ; Geomorfodinámica ; Namibie ; Precipitación ; Transporte eólico ; VientoHelga's Dune : 40 years of dune dynamics in the Namib Desert
Southern African geomorphology : looking back, moving forward
Auteur(s) et Affiliation(s)
BESLER, H.
Dept. of Geography, Univ., Cologne, Allemagne
LANCASTER, N.
Desert Research Institute, Reno, Etats-Unis
BRISTOW, C.
Birbeck, Univ., London, Royaume-Uni
HENSCHEL, J.
Gobabeb Research and Training Centre, Walvis Bay, Namibie
LIVINGSTONE, I.
School of Science and Technology, Univ., Northampton, Royaume-Uni
SEELY, M.
Gobabeb Research and Training Centre, Walvis Bay, Namibie
Desert Research Foundation of Namibia, Windhoek, Namibie
WHITE, K.
Dept. of Geography and Environmental Science, Univ., Reading, Royaume-Uni
SUMNER, P.D.
Dept. of Geography, Geoinformatics and Meteorology, Univ., Pretoria, Afrique du Sud
NEL, W.
Dept. of Geography and Environmental Science, Univ. of Fort Hare, Alice, Afrique du Sud
HOLMES, P.J.
Dept. of Geography, Univ. of the Free State, Bloemfontein, Afrique du Sud
Description :
The dynamics of a small linear dune on the northern margin of the Namib Sand Sea, in the area south of Gobabeb, have been monitored using erosion pins placed at the dune tip since 1969. GPS measurements of these pins enabled estimation of the rates of advance and lateral migration of the dune. Rates of advance and lateral movement varied over the period of monitoring, 1969-2012, with a decrease in rates of advance by a factor of 50%, but an increase in the rate of lateral movement. Changes in dune behavior appear to be related to changes in wind regime and the vegetation cover of the interdune area, as a result of increased rainfall in recent years. This study demonstrates the dynamic nature of the tip of this dune and its sensitivity to changes in winds and sand supply.
Type de document :
Article de monographie
Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2013, vol. 95, n°. 4, p. 361-368, nombre de pages : 8, Références bibliographiques : 21 ref.
Date :
2013
Editeur :
Pays édition : Suede, Stockholm, Svenska sällskapet för antropologi och geografi
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)