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PhD project: Sediment Production: Lithological And Subglacial Hydrogeological controls (SPLASH)

Lena Uldal Hansen

Doktorand

PhD project: Sediment Production: Lithological And Subglacial Hydrogeological controls (SPLASH)

A cross-validated three-dimensional model of an englacial and subglacial drainage system in a High-Arctic glacier

Författare

  • Lena Uldal Hansen
  • Jan A. Piotrowski
  • Douglas I. Benn
  • Heidi Sevstre

Summary, in English

Recent speleological surveys of meltwater drainage systems in cold and polythermal glaciers have documented dynamic englacial and in some cases subglacial conduits formed by the ‘cut-and- closure’ mechanism. Investigations of the spatial distribution of such conduits often require a combination of different methods. Here, we studied the englacial drainage system in the cold gla- cier Longyearbreen, Svalbard by combining speleological exploration of a 478 m long meltwater conduit with a high-resolution ground penetrating radar (GPR) survey with two different centre- frequencies (25 and 100 MHz). The results yielded a 3-D documentation of the present englacial drainage system. The study shows that the overall form of englacial conduits can be detected from velocity−depth converted GPR data, and that the 3-D model can facilitate a method to pinpoint the reflections in a radargram corresponding with the englacial drainage system, although fine detail cannot be resolved. Visible reflections approximately parallel to the mapped englacial water drainage system likely result from sediment incorporated in the ice or from abandoned parts of the englacial drainage system.

Avdelning/ar

  • Kvartärgeologi

Publiceringsår

2020-01-03

Språk

Engelska

Sidor

1-13

Publikation/Tidskrift/Serie

Journal of Glaciology

Volym

67

Issue

256

Dokumenttyp

Artikel i tidskrift

Förlag

International Glaciological Society

Ämne

  • Geophysics
  • Climate Research

Nyckelord

  • Arctic glaciology
  • glacier hydrology
  • ground-penetrating radar

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0022-1430