New data on tributary terraces and a reappraisal of the incision history of the Jinshan Gorge, middle Yellow River

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Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_78735785DFBD
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
New data on tributary terraces and a reappraisal of the incision history of the Jinshan Gorge, middle Yellow River
Journal
Geomorphology
Author(s)
Zhong Yuezhi, Picotti Vincenzo, Xiong Jianguo, Willett Sean D., Schmidt Christoph, King Georgina
ISSN
0169-555X
Publication state
Published
Issued date
10/2024
Peer-reviewed
Oui
Volume
462
Pages
109330
Language
english
Abstract
River channel profiles and river terraces are two typical landscape features to investigate river incision history. However, incision history inferred from the two markers can be inconsistent. For example, along the Jinshan Gorge in the middle Yellow River, pseudo-terraces (a virtual metric derived from channel profile modelling) suggest a recent acceleration in incision rates only in the southern gorge, and the northern keeps steady, while river terraces in the trunk channel indicate recently increased incision rates all along the gorge. To mitigate these discrepancies, we investigate six tributaries along the Jinshan Gorge by mapping and dating several strath terraces at various distances from the confluence to the trunk channel. By comparing tributary terraces of similar age, we find generally increasing incision rates towards the confluence with the trunk river in the southern Jinshan Gorge. North to south increasing incision rates along the gorge are also observed from coeval tributary terraces. In addition, two different landscapes between the southern and northern tributaries near the confluence are recognized, one with a deeply incised gorge and another one with floodplains, suggesting incision rate in the northern gorge is steady through time. Integrating the new infrared stimulated luminescence (IRSL) and Accelerator Mass Spectrometry (AMS) 14C data from tributaries with the abundant literature data of terrace samples mostly in the Jinshan Gorge dated with various methods, we suggest published ages from optically stimulated luminescence (OSL) might be too young. The methodological limitation associated to the dating method can explain the observed mismatch of incision history in the northern gorge inferred from pseudo-terraces and from river terraces in the trunk channel, and reconcile some contradicting patterns in published trunk terrace data.
Keywords
Tributary terraces, Jinshan Gorge, Incision history, Middle Yellow River
Web of science
Open Access
Yes
Create date
17/09/2024 12:10
Last modification date
18/10/2024 15:58
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