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• W2035487645 abstract "Research Article| August 01, 2014 Evolution of lumpy glacial landscapes Robert S. Anderson Robert S. Anderson Department of Geological Sciences, and Institute of Arctic and Alpine Research (INSTAAR), University of Colorado, Boulder, Colorado 80303, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Robert S. Anderson Department of Geological Sciences, and Institute of Arctic and Alpine Research (INSTAAR), University of Colorado, Boulder, Colorado 80303, USA Publisher: Geological Society of America Received: 03 Feb 2014 Revision Received: 16 May 2014 Accepted: 21 May 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (8): 679–682. https://doi.org/10.1130/G35537.1 Article history Received: 03 Feb 2014 Revision Received: 16 May 2014 Accepted: 21 May 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Robert S. Anderson; Evolution of lumpy glacial landscapes. Geology 2014;; 42 (8): 679–682. doi: https://doi.org/10.1130/G35537.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract At 10–100 m scales, glaciated landscapes are lumpy, sporting rocky bedforms with abraded upvalley faces and sharp, quarried downvalley edges. Using models that operate at two time scales, I address glacial landform development at these scales in order to explore the dependence of bed topography and erosion rate on glacier and rock properties. Sliding at the bed, a prerequisite for both abrasion and quarrying, is strongly modulated by water pressures. Short-time-scale models designed to capture the transient hydro-sliding system beneath a temperate glacier quantify the temporal and spatial pattern of effective stress on the glacier bed. The bed is subjected to repetitive stressing focused on the edges of bed steps, the frequency and magnitude of stress events increasing with ice thickness. The numerical model of bed evolution at longer time scales incorporates both abrasion and quarrying of fracture-bound blocks. The probability of quarrying of a block by a particular stress event is taken to depend inversely upon both block size and the depth of the niche in which it sits. Upglacier-migrating rock bedforms with 10–100 m wavelengths inevitably emerge, reflecting efficient quarrying of blocks from downvalley-facing steps in the bed. The relative importance of abrasion and quarrying, and bed roughness, are controlled by fracture spacing, and major steps in the valley floor are attributable to transitions in fracture spacing. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2035487645 title "Evolution of lumpy glacial landscapes" @default.
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