Rates of Change on Spillway Lake Ngozumpa Glacier, Nepal Ulyana N. Horodyskyj University of Colorado Boulder July 14, 2013
• Background • The beginning: 2011 time-lapse of supraglacial ponds
• 2012/13 supraglacial ponds + Spillway Lake changes
• Sherpa-Scientist Initiative • Pilot project in Cordillera Blanca
Supraglacial lake formation
central and eastern Himalaya greatly affected
due to lower angle (slopes) of glaciers
Loss of life and infrastructure
Increase in flood potential
1985 - Dig Tsho outburst ($1.5 million damages)
due to storage of water in lakes
due to exposure of bare ice walls
David Breashears, GlacierWorks
Snapshots of Change N
Ngozumpa Glacier, Nepal
Side View Ngozumpa Glacier Cho Oyu
2009 - Breashears
Project Objectives 1. Use time-lapse photography from melt seasons to qualitatively and semi-quantitatively document lake changes. 2. Document terminal (spillway) lake area and depth changes, to determine growth rates through time. 3. Quantify some physics of lake deepening and expansion.
Back in 2011...
2012 Dcam Lake X
November 2012: Investigating a Spillway Situation
Everest Base Camp 2008 Spy Accusations
Important Findings: - Multiple drain/fill events occur throughout a melt season. - Satellites may mask this volume loss.
- Drainages can occur even post-freeze. - End of melt season may not mean end of volume loss.