2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Paper No. 334-3
Presentation Time: 1:35 PM

TERMINUS FLOW DYNAMICS AND BASAL CONDITIONS OF THE TAKU GLACIER, ALASKA


ABSTRACT WITHDRAWN

, dougal@pdx.edu

Since 1890, Taku Glacier in southeast Alaska has been in the advancing stage of the tidewater glacier cycle. Because most alpine valley glaciers are currently in retreat, this glacier provides a rare opportunity to study the dynamics of an advancing tidewater glacier and glean a deeper understanding of basal conditions in the terminus region. In this study, we use GPS tracking to establish surface flow velocities. These measurements are correlated with changes in the near terminus water flux, which are approximated using ablation wire measurements, precipitation data, and a site-specific temperature index model. We also use radio echo sounding to examine subglacial sediment excavation rates in the overdeepened region of the terminus and time lapse cameras look at sediment and water fluxes from the glacier terminus. These data will allow us to better understand the flow dynamics of Taku Glacier and its response to overdeepening of the bed.