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Supraglacial Debris of G2 Glacier in Hidden Valley, Mukut Himal, Nepal *

  • M. Nakawo (a1)

Abstract

Field investigations of supraglacial debris were carried out during the monsoon season in 1974 on G2 glacier near Tukche Peak in Hidden Valley, Mukut Himal, Nepal. The thickness of the debris layer was observed to increase down-glacier. Laboratory analysis, however, showed a decrease in particle size in the same direction. This decrease is explained in terms of mixing of particles contained in glacier ice with the original debris as melting proceeds. A simple relation between debris mass and glacier flow is introduced to explain the observed results.

Résumé

Des recherches sur le terrain sur les moraines superficielles ont été effectuées pendant la mousson en 1974 sur le glacier G2 prés de Tukche Peak de Hidden Valley, Mukut Himal, au Népal. On a observé que la couche de matériaux allait en augmentant en épaisseur d’amont à aval du glacier. Les analyses en laboratoire ont toutefois montré une diminution de la grosseur des particules dans la même direction. Cette diminution s’explique par le mélange des particules contenues dans la glace avec les débris originaux à mesure qu’elle fond. On présente une relation simple entre la masse de débris et l’écoulement du glacier afin d’expliquer les résultats observés.

Zusammenfassung

Während der Monsun-Periode von 1974 wurden am G2-Gletscher nahe dem Tukche Peak im Hidden Valley, Mukut Himal, Nepal, Felduntersuchungen des Oberflächenschutts durchgeführt. Die Dicke der Schuttschicht nimmt gletscherabwärts zu. Laboranalysen ergaben andererseits eine Abnahme der Partikelgrösse in derselben Richtung. Diese Abnahme wird aus der Einmischung von Partikeln aus dem Gletschereis in den ursprünglichen Schutt bei fortschreitender Abschmelzung erklärt. Eine einfache Beziehung zwischen der Schuttmasse und dem Gletscherfluss wird zur Analyse der gewonnenen Ergebnisse herangezogen.

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Copyright

Footnotes

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Present address: Geotechnical Section, Division of Building Research, National Research Council, Ottawa, Canada KIA 0R6

*

Glaciological Expedition to Nepal, Contribution No. 59.

Footnotes

References

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