Flux of debris transported by ice at three Alaskan tidewater glaciers

摘要: The stability of tidewater terminus is controlled by glacial dynamics. Calving processes and sedimentary at the grounding line. An investigation grounding-line sediment dynamics morainal-bank budgets in Glacier Bay, Alaska, U.S.A., has yielded data that enable us to determine debris fluxes Grand Pacific, Margerie Muir Glaciers, Debris flux ranges from 10 5 6 m 3 a −1 , one two orders magnitude lower than glacifluvial (10 -10 7 ). Combined these represent highest yields known for glacierized basins. Large reflect combined effecrs rapid glacier flow, driven maritime climate southeast highly erodible bedrock, Englacial-debris distribution affected valley width relief both which control availability sediment. number tributaries controls volume englacial supraglacial moraines. At terminus, iceberg-rafting removes up more ice-proximal environment deposited melt-out or dumped during calving events. Rough estimates deforming beds suggests soft-bed deformation may deliver an order released within ice.