气候变化领域集成服务门户(CCPortal): Drainage basin dynamics during the transition from early to mature orogeny in Southern Taiwan

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DOI	10.1016/j.epsl.2021.116874
	Drainage basin dynamics during the transition from early to mature orogeny in Southern Taiwan
	Chen C.-Y.; Willett S.D.; Christl M.; Shyu J.B.H.
发表日期	2021
ISSN	0012821X
卷号	562
英文摘要	The southern Central Range of Taiwan is in an early stage of orogeny and the landscape has not yet reached a steady state. To reveal the nature of the transient landscape and its evolution towards a steady state during orogeny, we conducted an in-situ 10Be cosmogenic nuclide study together with geomorphic analyses to characterize the spatial pattern of erosion rate at the scale of individual catchments. Sediment samples were collected at outlets of major basins, and within nested sub-basins. Basin-wide erosion rates were estimated from 10Be concentrations and basin mean 10Be production rates. The erosion rates of major basins show a northward increasing trend, which is consistent with the pattern of mean basin channel steepness, reflecting the early stage of orogeny and indicating that the landscape is evolving in response to tectonic forcing. However, nested samples reveal significant spatial variability in erosion rate at the sub-basin scale. These spatial variations are consistent with predictions of divide motion from χ analysis and other geomorphic metrics including cross-divide asymmetry. These suggest that the main divide is moving towards the west in southernmost Taiwan. We also found evidence of internal basin reorganization with several cases of growing basins at the expense of neighboring basins. These findings imply that even though tectonic forcing dominates the large-scale patterns, basin reorganization is a significant process affecting spatial patterns of erosion rate at the smaller scale, so that topographic steady state is likely to be found only for the largest characteristics of the landscape. © 2021 Elsevier B.V.
关键词	divide migration erosion in-situ 10Be landscape evolution Taiwan χ analysis
英文关键词	Catchments; Tectonics; $+10$/Be; Divide migration; Erosion rates; In-situ 10be; Landscape evolutions; Spatial patterns; Steady state; Taiwan; Tectonic forcing; Χ analyse; Erosion; channel flow; concentration (composition); drainage basin; erosion rate; flow modeling; numerical model; steady-state equilibrium; Taiwan
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203053
作者单位	ETH Zurich, Department of Earth Sciences, Sonneggstrasse 5, Zurich, 8092, Switzerland; National Taiwan University, Department of Geosciences, No. 1, Sec. 4, Roosevelt Rd., Taipei, 106, Taiwan; ETH Zurich, Department of Physics, Laboratory of Ion Beam Physics, Otto-Stern-Weg 5, Zurich, 8093, Switzerland
推荐引用方式 GB/T 7714	Chen C.-Y.,Willett S.D.,Christl M.,et al. Drainage basin dynamics during the transition from early to mature orogeny in Southern Taiwan[J],2021,562.
APA	Chen C.-Y.,Willett S.D.,Christl M.,&Shyu J.B.H..(2021).Drainage basin dynamics during the transition from early to mature orogeny in Southern Taiwan.Earth and Planetary Science Letters,562.
MLA	Chen C.-Y.,et al."Drainage basin dynamics during the transition from early to mature orogeny in Southern Taiwan".Earth and Planetary Science Letters 562(2021).