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Thermal regime for a thufa apex and its adjoining depression, Mashai Valley, Lesotho

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  • Stefan Grab

Abstract

A 12 month study on the thermal regime for a thufa apex and its adjoining depression was undertaken in the Mashai Valley (∽2950 m ASL), Lesotho Highlands, during 1993–94. Pronounced temperature differentials occurred during the winter months when apexes were frozen for several weeks and depressions remained predominantly unfrozen. The data show that existing micro‐topography is an important factor controlling the maintenance or further development of thufur in marginal periglacial environments. © 1997 John Wiley & Sons, Ltd. Une étude du régime thermique du sommet d'un thufa et de la dépression qui le borde a été poursuivie dans la vallée de Mashai (2950 m au‐dessus du niveau de la mer) dans les hautes terres du Lesotho pendant 12 mois en 1993–94. Des différences de température importantes existent pendant les mois d'hiver quand les sommets des thufurs sont gelés pendant plusieurs semaines et que les dépressions restent non gelées. Les données montrent que la microtopographie existante est un facteur important contrôlant la conservation et le développement des thufurs dans les environnements périglaciaires marginaux. © 1997 John Wiley & Sons, Ltd.

Suggested Citation

  • Stefan Grab, 1997. "Thermal regime for a thufa apex and its adjoining depression, Mashai Valley, Lesotho," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 8(4), pages 437-445, October.
    • Handle: RePEc:wly:perpro:v:8:y:1997:i:4:p:437-445
    DOI: 10.1002/(SICI)1099-1530(199710/12)8:43.0.CO;2-O
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