The Influence of Transport Stage on Preserved Fluvial Cross Strata

Autor: Debsmita Das, Vamsi Ganti, Ryan Bradley, Jeremy Venditti, Arjan Reesink, Daniel R. Parsons
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Geophysical Research Letters, Vol 49, Iss 18, Pp n/a-n/a (2022)
Druh dokumentu: article
ISSN: 1944-8007
0094-8276
DOI: 10.1029/2022GL099808
Popis: Abstract Fluvial cross strata are depositional products of bedform migration that record formative flow and sediment transport conditions on planetary bodies. Bedform evolution varies with transport stage even under constant flow depths, but our understanding of how prevailing sediment transport conditions affect preserved cross strata is limited. Here, we analyzed experimental bedform evolution and preserved set thickness spanning threshold‐of‐motion to suspension‐dominated transport conditions at multiple equilibrium flow depths. Results show that bedform trough depth and mean preserved set thickness have a parabolic dependence on transport stage, with maximum values observed at intermediate transport stages. Our results indicate that transport stage is a key control on the flow‐depth‐normalized set thickness but set thickness is a poor indicator of flow depth. Thus, the dependence of bedform dimensions on transport stage should be considered in paleohydraulic reconstruction, and the analysis of set thickness may aid in the estimation of ancient fluvial sediment flux.
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