Bedload-to-suspended load ratio and rapid bedrock incision from Himalayan landslide-dam lake record
作者： Beth Pratt-Sitaula , Michelle Garde , Douglas W. Burbank , Michael Oskin , Arjun Heimsath
DOI: 10.1016/J.YQRES.2007.03.005
关键词:
摘要: About 5400 cal yr BP, a large landslide formed N400-m-tall dam in the upper Marsyandi River, central Nepal. The resulting lacustrine and deltaic deposits stretched N7 km upstream, reaching thickness of 120 m. 14 C dating 7 wood fragments reveals that aggradation subsequent incision occurred remarkably quickly (∼500 yr). Reconstructed volumes (∼0.16 3 ) (∼0.09 indicate bedload-to-suspended load ratio 1:2, considerably higher than ≤1:10 is commonly assumed. At downstream end dam, river incised new channel through ≥70 m Greater Himalayan gneiss, requiring minimum bedrock rate 13 mm/ over last yr. majority presumably fraction this time, suggesting much rates. high bedload from such an energetic mountain particularly significant addition to our knowledge sediment flux orogenic environments. © 2007 University Washington. All rights reserved.
harvard.edu
elsevier.com
ucsb.edu 
sci-hub.se 参考文章(41)
Kelin X Whipple, Eric Kirby, Simon H. Brocklehurst, Geomorphic limits to climate-induced increases in topographic relief Nature. ,vol. 401, pp. 39- 43 ,(1999) , 10.1038/43375
Christian France-Lanord, Louis A. Derry, Organic carbon burial forcing of the carbon cycle from Himalayan erosion Nature. ,vol. 390, pp. 65- 67 ,(1997) , 10.1038/36324
Mikaël Attal, Jérôme Lavé, Changes of bedload characteristics along the Marsyandi River (central Nepal): Implications for understanding hillslope sediment supply, sediment load evolution along fluvial networks, and denudation in active orogenic belts Tectonics, Climate, and Landscape Evolution. ,vol. 398, pp. 143- 171 ,(2006) , 10.1130/2006.2398(09)
L. Ermini, N. Casagli, Prediction of the behaviour of landslide dams using a geomorphological dimensionless index Earth Surface Processes and Landforms. ,vol. 28, pp. 31- 47 ,(2003) , 10.1002/ESP.424
M. E. Raymo, W. F. Ruddiman, Tectonic forcing of late Cenozoic climate Nature. ,vol. 359, pp. 117- 122 ,(1992) , 10.1038/359117A0
M. Inbar, A. P. Schick, Bedload transport associated with high stream power, Jordan River, Israel Proceedings of the National Academy of Sciences of the United States of America. ,vol. 76, pp. 2515- 2517 ,(1979) , 10.1073/PNAS.76.6.2515
John F Shroder Jr, Michael P Bishop, None, Mass movement in the Himalaya: new insights and research directions Geomorphology. ,vol. 26, pp. 13- 35 ,(1998) , 10.1016/S0169-555X(98)00049-X
Sean D. Willett, Orogeny and orography: The effects of erosion on the structure of mountain belts Journal of Geophysical Research. ,vol. 104, pp. 28957- 28981 ,(1999) , 10.1029/1999JB900248
L. B. Leopold, W. W. Emmett, Bedload measurements, East Fork River, Wyoming. Proceedings of the National Academy of Sciences of the United States of America. ,vol. 73, pp. 1000- 1004 ,(1976) , 10.1073/PNAS.73.4.1000
John D. Milliman, James P. M. Syvitski, Geomorphic/Tectonic Control of Sediment Discharge to the Ocean: The Importance of Small Mountainous Rivers The Journal of Geology. ,vol. 100, pp. 525- 544 ,(1992) , 10.1086/629606