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

Détails

Ressource 1Télécharger: Zhong2024.pdf (12649.08 [Ko])
Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_78735785DFBD
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
New data on tributary terraces and a reappraisal of the incision history of the Jinshan Gorge, middle Yellow River
Périodique
Geomorphology
Auteur⸱e⸱s
Zhong Yuezhi, Picotti Vincenzo, Xiong Jianguo, Willett Sean D., Schmidt Christoph, King Georgina
ISSN
0169-555X
Statut éditorial
Publié
Date de publication
10/2024
Peer-reviewed
Oui
Volume
462
Pages
109330
Langue
anglais
Résumé
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.
Mots-clé
Tributary terraces, Jinshan Gorge, Incision history, Middle Yellow River
Web of science
Open Access
Oui
Création de la notice
17/09/2024 12:10
Dernière modification de la notice
18/10/2024 15:58
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