Articles | Volume 12, issue 2
https://doi.org/10.5194/esurf-12-515-2024
https://doi.org/10.5194/esurf-12-515-2024
Research article
 | 
17 Apr 2024
Research article |  | 17 Apr 2024

Downstream rounding rate of pebbles in the Himalaya

Prakash Pokhrel, Mikael Attal, Hugh D. Sinclair, Simon M. Mudd, and Mark Naylor

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Cited articles

Abbott, P. L. and Peterson, G. L.: Effects of abrasion durability on conglomerate clast populations; examples from Cretaceous and Eocene conglomerates of the San Diego area, California, J. Sediment. Petrol., 48, 31–42, https://doi.org/10.1306/212F73EC-2B24-11D7-8648000102C1865D, 1978. a
Attal, M. and Lavé, J.: 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, vol. 398, Geological Society of America, https://doi.org/10.1130/2006.2398(09), 2006. a
Attal, M. and Lavé, J.: Pebble abrasion during fluvial transport: Experimental results and implications for the evolution of the sediment load along rivers, J. Geophys. Res., 114, F04023, https://doi.org/10.1029/2009jf001328, 2009. a, b, c, d
Attal, M., Lavé, J., and Masson, J.-P.: New Facility to Study River Abrasion Processes, J. Hydraul. Eng., 132, 624–628, https://doi.org/10.1061/(ASCE)0733-9429(2006)132:6(624), 2006. a
Barrett, P. J.: The shape of rock particles, a critical review, Sedimentology, 27, 291–303, https://doi.org/10.1111/j.1365-3091.1980.tb01179.x, 1980. a, b
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Short summary
Pebbles become increasingly rounded during downstream transport in rivers due to abrasion. This study quantifies pebble roundness along the length of two Himalayan rivers. We demonstrate that roundness increases with downstream distance and that the rates are dependent on rock type. We apply this to reconstructing travel distances and hence the size of ancient Himalaya. Results show that the ancient river network was larger than the modern one, indicating that there has been river capture.
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