Articles | Volume 6, issue 4
Research article
07 Nov 2018
Research article |  | 07 Nov 2018

Uniform grain-size distribution in the active layer of a shallow, gravel-bedded, braided river (the Urumqi River, China) and implications for paleo-hydrology

Laure Guerit, Laurie Barrier, Youcun Liu, Clément Narteau, Eric Lajeunesse, Eric Gayer, and François Métivier


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Short summary
The grain-size distribution of ancient alluvial systems is commonly determined from sections of gravel deposits exposed vertically to reconstruct paleo-environments or changes in tectonics and/or climate. To test whether such a grain-size distribution is equivalent to one of the sediments that was in direct contact with the flow at the time of deposition, we dug a large trench in an active gravel-bedded, braided river. We show that the granulometry is uniform at the scale of the active layer.