干旱区生态环境知识资源中心(Arid): Spatio-temporal reconstruction of avulsion history at the terminus of a modern dryland river system

Arid

DOI	10.1002/esp.5311
	Spatio-temporal reconstruction of avulsion history at the terminus of a modern dryland river system
	Donselaar, Marinus E.; Gozalo, Margarita C. Cuevas; van Toorenenburg, Koen A.; Wallinga, Jakob
通讯作者	Donselaar, ME (corresponding author)，Delft Univ Technol, Dept Geosci & Engn, POB 5048, NL-2600 Delft, Netherlands.
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
ISSN	0197-9337
EISSN	1096-9837
出版年	2022-01
英文摘要	Fluvial depositional architecture in an unconfined environment is governed by sediment dispersal across the alluvial plain through river-path switching by avulsion. Documented inter-avulsion periodicity from modern rivers ranges from tens to over a thousand years. In this study, a quantitative spatio-temporal reconstruction of avulsion history is presented of the non-vegetated and pristine modern Rio Colorado dryland river system in the semi-arid Altiplano Basin (Bolivia), based on the integrated analysis of satellite imagery and absolute age dating using optically stimulated luminescence, complemented with sedimentological and geomorphological ground-truth data. This approach enables us to reconstruct the chronological order of channel belts of the Rio Colorado, to determine avulsion recurrence time and inter-avulsion periodicity, to identify mechanisms for flow path changes, and to present a morphodynamic model for the spatio-temporal evolution of fluvial deposits in a semi-arid environment. In a maximum timespan of 12.71 +/- 1.5 ka, successive avulsions of the Rio Colorado created a sheet of interconnected fluvial deposits, consisting of diverging and juxtaposed alluvial ridges that formed by sediment aggradation in point bars, crevasse splays, levees, and on the channel floor. The ridges show lateral onlap and amalgamation as the result of repeated avulsion and compensational stacking, whereby the river avoided the positive alluvial-ridge relief of its precursors. The resultant morphology is fan-shaped, convex-up with a surface area of approximately 500 km(2) and a maximum observed thickness of 3 m. The results show inter-avulsion periods of the river of up to 1.28 +/- 0.34 ka. A paucity in fluvial activity around 2 ka BP, and at present, is interpreted as the result of low river discharge related to long-term dry periodicity in the El Nino Southern Oscillation circulation system. Each river path started as a low sinuous, single-thread channel in a narrow belt, and in time increased its width and sinuosity by point-bar expansion and rotation.
英文关键词	alluvial ridges avulsion frequency compensational stacking crevasse splays endorheic basin fluvial geomorphology meandering-channel belts OSL age determination river avulsion semi-arid climate
类型	Article ; Early Access
语种	英语
开放获取类型	hybrid, Green Published
收录类别	SCI-E
WOS记录号	WOS:000745529600001
WOS关键词	SOUTHERN BOLIVIAN ALTIPLANO ; RHINE-MEUSE DELTA ; TRANSMISSION LOSSES ; CLIMATE ; ORIGIN ; KOSI ; STRATIGRAPHY ; MECHANISMS ; TIMESCALES ; FREQUENCY
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377097
作者单位	[Donselaar, Marinus E.; van Toorenenburg, Koen A.] Delft Univ Technol, Dept Geosci & Engn, POB 5048, NL-2600 Delft, Netherlands; [Donselaar, Marinus E.] Katholieke Univ Leuven, Dept Earth & Environm Sci, Leuven, Belgium; [van Toorenenburg, Koen A.] Shell Int Explorat & Prod BV, The Hague, Netherlands; [Wallinga, Jakob] Wageningen Univ, Netherlands Ctr Luminescence Dating, Wageningen, Netherlands; [Wallinga, Jakob] Wageningen Univ, Soil Geog & Landscape Grp, Wageningen, Netherlands
推荐引用方式 GB/T 7714	Donselaar, Marinus E.,Gozalo, Margarita C. Cuevas,van Toorenenburg, Koen A.,et al. Spatio-temporal reconstruction of avulsion history at the terminus of a modern dryland river system[J],2022.
APA	Donselaar, Marinus E.,Gozalo, Margarita C. Cuevas,van Toorenenburg, Koen A.,&Wallinga, Jakob.(2022).Spatio-temporal reconstruction of avulsion history at the terminus of a modern dryland river system.EARTH SURFACE PROCESSES AND LANDFORMS.
MLA	Donselaar, Marinus E.,et al."Spatio-temporal reconstruction of avulsion history at the terminus of a modern dryland river system".EARTH SURFACE PROCESSES AND LANDFORMS (2022).