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Grain-size distribution of surface sediments of climbing and falling dunes in the Zedang valley of the Yarlung Zangbo River, southern Tibetan plateau

Grain-size distribution of surface sediments of climbing and falling dunes in the Zedang valley... Abstract Climbing and falling dunes are widespread in the wide valleys of the middle reaches of the Yarlung Zangbo River. Along a sampling transect running from northeast to southwest through 10 climbing dunes and two falling dunes in the Langsailing area, the surface sediments were sampled to analyse the grain-size characteristics, to clarify the transport pattern of particles with different grain sizes, and to discuss the effects of terrain factors including dune slope, mountain slope, elevation and transport distance to sand transport. Sand dunes on both sides of the ridge are mainly transverse dunes. Fine and medium sands were the main particles, with few very fine and coarse particles in the surface sediments. Particles \({>}4.00\varPhi \) were blown upslope by suspension, particles \(1.00{-}4.00\varPhi \) were mainly transported upslope by saltation with opposite change tendency, and particles \({<}1.00\varPhi \) mainly moved by creep were found almost exclusively at the bottom of the slopes. As terrain factors, elevation and transport distance were more important factors influencing the distribution of grain size and particle fraction on dunes. Local winds observation might be helpful for the transport mechanism study of particles on climbing and falling dunes, while the wind data from nearby weather station was hardly helpful. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png "Journal of Earth System Science" Springer Journals

Grain-size distribution of surface sediments of climbing and falling dunes in the Zedang valley of the Yarlung Zangbo River, southern Tibetan plateau

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References (56)

Publisher
Springer Journals
Copyright
2018 Indian Academy of Sciences
ISSN
2347-4327
eISSN
0973-774X
DOI
10.1007/s12040-018-1030-4
Publisher site
See Article on Publisher Site

Abstract

Abstract Climbing and falling dunes are widespread in the wide valleys of the middle reaches of the Yarlung Zangbo River. Along a sampling transect running from northeast to southwest through 10 climbing dunes and two falling dunes in the Langsailing area, the surface sediments were sampled to analyse the grain-size characteristics, to clarify the transport pattern of particles with different grain sizes, and to discuss the effects of terrain factors including dune slope, mountain slope, elevation and transport distance to sand transport. Sand dunes on both sides of the ridge are mainly transverse dunes. Fine and medium sands were the main particles, with few very fine and coarse particles in the surface sediments. Particles \({>}4.00\varPhi \) were blown upslope by suspension, particles \(1.00{-}4.00\varPhi \) were mainly transported upslope by saltation with opposite change tendency, and particles \({<}1.00\varPhi \) mainly moved by creep were found almost exclusively at the bottom of the slopes. As terrain factors, elevation and transport distance were more important factors influencing the distribution of grain size and particle fraction on dunes. Local winds observation might be helpful for the transport mechanism study of particles on climbing and falling dunes, while the wind data from nearby weather station was hardly helpful.

Journal

"Journal of Earth System Science"Springer Journals

Published: Feb 1, 2019

Keywords: Earth Sciences, general; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics)

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