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DOI	10.1016/j.geomorph.2023.108974
	Quantifying drainage divide migration in active orogens: Insights from the eastern margin of the Tibetan Plateau
	Yao, Xinbo; Tian, Yuntao
发表日期	2024
ISSN	0169-555X
EISSN	1872-695X
卷号	445
英文摘要	Landscape of active orogens results from a competition balance between tectonic rock uplift and erosion. Drainage divide migration is a useful approach for quantifying the landscape evolution and the underpinning drivers, because the fluvial networks adjust their geometry in response to spatiotemporal changes in rock uplift, climate and lithology. Many quantitative geomorphological metrics, such as chi-anomaly, Gilbert metrics, have been proposed to analyze the drainage divide migration. However, their interpretations often yield inconsistent results, especially in tectonically active orogens with spatial changes in rock uplift. The highly elevated and tectonically active eastern margin of the Tibetan Plateau has been studied by multiple methods of different time-scales, producing abundant structural and erosion rates determinations needed for evaluating the landscape stability and evolution. Here, we evaluated the effectiveness of chi-and Gilbert metrics in quantifying the stability of the Longmenshan-Minshan divide parallel with the plateau margin, by comparing with erosion rate data of different time scales, rock uplift predicted by upper crustal structures, bedrock lithology, precipitation. Our analyses reveal that the divide has reached dynamic steady state, as shown by the consistent cross-divide Gilbert metrics and consistent spatial changes of short, medium and long-term erosion rates, indicating the overall balance between the erosion and rock uplift. The spatial changes in rock uplift underpinned by reverse faulting along a listric upper crustal fault also explains the development of cross-divide chi-anomaly that cannot be used as an index for divide migration in regions with spatially nonuniform rock uplift. The formation of the long-term stable drainage divide in the EMTP serves as a natural laboratory for studying the divide formation and evolution in response to a phase of non-uniform rock uplift. We infer that in regions of this kind, drainage divide forms and evolves from uplift-driven to erosion-driven migration, via an intervening stable state.
关键词	chi-Metric Gilbert metrics Drainage divide Eastern margin of the Tibetan Plateau Landscape evolution
英文关键词	2008 WENCHUAN EARTHQUAKE; LONGMEN SHAN; THRESHOLD HILLSLOPES; FAULT ZONE; MIN-SHAN; QUATERNARY DEFORMATION; TECTONIC EVOLUTION; SURFACE UPLIFT; NORTHERN TIBET; SICHUAN
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:001113318200001
来源期刊	GEOMORPHOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283878
作者单位	Sun Yat Sen University; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai); Sun Yat Sen University
推荐引用方式 GB/T 7714	Yao, Xinbo,Tian, Yuntao. Quantifying drainage divide migration in active orogens: Insights from the eastern margin of the Tibetan Plateau[J],2024,445.
APA	Yao, Xinbo,&Tian, Yuntao.(2024).Quantifying drainage divide migration in active orogens: Insights from the eastern margin of the Tibetan Plateau.GEOMORPHOLOGY,445.
MLA	Yao, Xinbo,et al."Quantifying drainage divide migration in active orogens: Insights from the eastern margin of the Tibetan Plateau".GEOMORPHOLOGY 445(2024).