J�kulhlaup initiation by ice-dam flotation: the �significance of glacier debris content
✍ Scribed by Tweed, Fiona S.
- Book ID
- 101219744
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 78 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0360-1269
No coin nor oath required. For personal study only.
✦ Synopsis
Ice-dam flotation is a commonly described mechanism for the initiation of jo Èkulhlaups (catastrophic floods) from icedammed lakes, but predictions of the critical lake depth required for flotation often differ from the actual lake depth at which flotation occurs. Glacier debris content is identified as an insufficiently recognized variable in ice-dam flotation. It is demonstrated that high debris contents could suppress flotation, and thereby affect the timing, mechanism and magnitude of catastrophic lake drainage events. The density of the part of the glacier forming the ice dam (rather than pure ice density) is the key to predicting ice-dam flotation.