کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4687571 | 1635602 | 2006 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Icelandic jökulhlaup impacts: Implications for ice-sheet hydrology, sediment transfer and geomorphology
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
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![عکس صفحه اول مقاله: Icelandic jökulhlaup impacts: Implications for ice-sheet hydrology, sediment transfer and geomorphology Icelandic jökulhlaup impacts: Implications for ice-sheet hydrology, sediment transfer and geomorphology](/preview/png/4687571.png)
چکیده انگلیسی
Glaciers and ice sheets erode, entrain, and deposit massive quantities of debris. Fluxes of subglacial meltwater exert a fundamental control on ice dynamics and sediment transport budgets. Within many glacial systems outburst floods (jökulhlaups) constitute high magnitude, high frequency fluxes of meltwater relative to normal ablation controlled discharge. This paper presents a synthesis of research on recent Icelandic jökulhlaups and their geomorphological and sedimentary impact. We identify jökulhlaup impacts within subglacial, englacial and proglacial settings and discuss their wider significance for ice sheet hydrology, sediment transfer and geomorphology. Because jökulhlaups erode, deposit, and re-work sediment simultaneously, they usually cause significant glaciological and sedimentological impacts. Jökulhlaups that propagate as subglacial flood waves often produce widespread hydromechanical disruption at the glacier base. Recent Icelandic jökulhlaups have been recognised as highly efficient agents of reworking subglacial sediment and glacial sediment entrainment. Models of jökulhlaup impact, therefore, need to encompass the sub- and englacial environment in addition to the proglacial zone where research has traditionally been focussed. Most jökulhlaups transport sediment to proglacial sandar, and often directly to oceans where preservation potential of the impact is greater. Proglacial jökulhlaup deposits form distinctive sedimentary assemblages, coupled with suites of high-energy erosional landforms. This study of modern jökulhlaup processes and sedimentary products may be useful for the interpretation of meltwater processes associated with Quaternary ice sheets.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volume 75, Issues 1â2, April 2006, Pages 33-64
Journal: Geomorphology - Volume 75, Issues 1â2, April 2006, Pages 33-64
نویسندگان
Andrew J. Russell, Matthew J. Roberts, Helen Fay, Philip M. Marren, Nigel J. Cassidy, Fiona S. Tweed, Tim Harris,