Skip to Main content Skip to Navigation
Journal articles

Geometry of meandering and braided gravel-bed threads from the Bayanbulak Grassland, Tianshan, P. R. China

Abstract : The Bayanbulak Grassland, Tianshan, P. R. China, is located in an intramontane sedimentary basin where meandering and braided gravel-bed rivers coexist under the same climatic and geological settings. We report and compare measurements of the discharge, width, depth, slope and grain size of individual threads from these braided and meandering rivers. Both types of threads share statistically indistinguishable regime relations. Their depths and slopes compare well with the threshold theory, but they are wider than predicted by this theory. These findings are reminiscent of previous observations from similar gravel-bed rivers. Using the scaling laws of the threshold theory, we detrend our data with respect to discharge to produce a homogeneous statistical ensemble of width, depth and slope measurements. The statistical distributions of these dimensionless quantities are similar for braided and meandering threads. This suggests that a braided river is a collection of intertwined threads, which individually resemble those of meandering rivers. Given the environmental conditions in Bayanbulak, we furthermore hypothesize that bedload transport causes the threads to be wider than predicted by the threshold theory.
Complete list of metadata

Cited literature [40 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01499421
Contributor : Hugo Chauvet Connect in order to contact the contributor
Submitted on : Friday, March 31, 2017 - 1:51:38 PM
Last modification on : Thursday, March 17, 2022 - 10:08:27 AM
Long-term archiving on: : Saturday, July 1, 2017 - 1:32:59 PM

File

esurf-4-273-2016.pdf
Publisher files allowed on an open archive

Identifiers

Relations

Citation

François Métivier, Olivier Devauchelle, Hugo Chauvet, Eric Lajeunesse, Patrick Meunier, et al.. Geometry of meandering and braided gravel-bed threads from the Bayanbulak Grassland, Tianshan, P. R. China. Earth Surface Dynamics, European Geosciences Union, 2016, 4 (1), pp.273-283. ⟨10.5194/esurf-4-273-2016⟩. ⟨hal-01499421⟩

Share

Metrics

Record views

267

Files downloads

161