Morphology of meandering and braided gravel-bed streams from the Bayanbulak Grassland, Tianshan, China - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Earth Surface Dynamics Discussions Year : 2015

Morphology of meandering and braided gravel-bed streams from the Bayanbulak Grassland, Tianshan, China

E. Lajeunesse
K. Blanckaert
  • Function : Author
Z. Zhang
Y. Fan
  • Function : Author
Y. Liu
Z. Dong
  • Function : Author
B. Ye
  • Function : Author

Abstract

The Bayanbulak Grassland, Tianshan, China is located in an intramountane sedimentary basin where meandering and braided gravel-bed streams coexist under the same climatic and geological settings. We report on measurements of their discharge, width, depth, slope and grain size. Based on this data set, we compare the morphology of individual threads from braided and meandering streams. 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 streams. 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 streams. This suggests that a braided river is a collection of intertwined channels, which individually resemble isolated streams. Given the environmental conditions in Bayanbulak, we furthermore hypothesize that bedload transport causes the channels to be wider than predicted by the threshold theory.
Fichier principal
Vignette du fichier
esurfd-3-1289-2015.pdf (4.46 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

insu-03579369 , version 1 (18-02-2022)

Licence

Identifiers

Cite

F. Métivier, O. Devauchelle, H. Chauvet, E. Lajeunesse, P. Meunier, et al.. Morphology of meandering and braided gravel-bed streams from the Bayanbulak Grassland, Tianshan, China. Earth Surface Dynamics Discussions, 2015, 3, pp.1289-1316. ⟨10.5194/esurfd-3-1289-2015⟩. ⟨insu-03579369⟩
15 View
13 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More