کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1046201 | 944869 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Bedload-to-suspended load ratio and rapid bedrock incision from Himalayan landslide-dam lake record
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
About 5400 cal yr BP, a large landslide formed a > 400-m-tall dam in the upper Marsyandi River, central Nepal. The resulting lacustrine and deltaic deposits stretched > 7 km upstream, reaching a thickness of 120 m. 14C dating of 7 wood fragments reveals that the aggradation and subsequent incision occurred remarkably quickly (â¼Â 500 yr). Reconstructed volumes of lacustrine (â¼Â 0.16 km3) and deltaic (â¼Â 0.09 km3) deposits indicate a bedload-to-suspended load ratio of 1:2, considerably higher than the â¤Â 1:10 that is commonly assumed. At the downstream end of the landslide dam, the river incised a new channel through â¥Â 70 m of Greater Himalayan gneiss, requiring a minimum bedrock incision rate of 13 mm/yr over last 5400 yr. The majority of incision presumably occurred over a fraction of this time, suggesting much higher rates. The high bedload ratio from such an energetic mountain river is a particularly significant addition to our knowledge of sediment flux in orogenic environments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Research - Volume 68, Issue 1, July 2007, Pages 111-120
Journal: Quaternary Research - Volume 68, Issue 1, July 2007, Pages 111-120
نویسندگان
Beth Pratt-Sitaula, Michelle Garde, Douglas W. Burbank, Michael Oskin, Arjun Heimsath, Emmanuel Gabet,