气候变化领域集成服务门户(CCPortal): Multidecadal Evolution of the Turbidity Maximum Zone in a Macrotidal River Under Climate and Anthropogenic Pressures

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DOI	10.1029/2020JC016273
	Multidecadal Evolution of the Turbidity Maximum Zone in a Macrotidal River Under Climate and Anthropogenic Pressures
	Jalón-Rojas I.; Dijkstra Y.M.; Schuttelaars H.M.; Brouwer R.L.; Schmidt S.; Sottolichio A.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	Climate and human pressures can influence the evolution of estuarine sediment dynamics concurrently, but the understanding and quantification of their cause–effect relationships are still challenging due to the occurrence of complex hydro-morpho-sedimentary feedbacks. The Garonne Tidal River (GTR, upper Gironde Estuary, France) is a clear example of a system stressed by both anthropogenic and climate change, as it has been subject to decreasing river discharges, natural morphological changes, and gravel extraction. To understand the relative effect of each hydrological and geomorphological pressure on the turbidity maximum zone (TMZ), the sediment dynamics in the GTR over the last six decades was evaluated using the width-averaged idealized iFlow model. Model results show a gradual increase in tidal amplitude and currents over the decades that has led to the upstream shift of the landward sediment-transport capacity components (external M4 tide, spatial settling lag, and tidal return flow). The upstream displacement of the TMZ between the 1950s and the 2010s was estimated to be at least 19 km, of which about three fourth was induced by geomorphological changes and one fourth by hydrological changes. Concerning the geomorphological changes, the natural evolution of the lower Gironde morphology was the main pressure inducing the displacement of the TMZ in the GTR. Anthropogenic and natural changes in morphology and bed roughness in the GTR itself also contributed to this evolution. The natural geomorphological changes were, in turn, probably promoted by the evolution of sediment dynamics, so this study reveals the closed circle that governs the intensification of the TMZ. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Climate pressures; estuarine turbidity maximum; human pressures; hydro-morpho-sedimentary feedbacks; idealized modeling; sediment-transport capacity
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186320
作者单位	UMR5805 EPOC, CNRS, OASU, Université de Bordeaux, Pessac, France; The Sino-Australian Research Centre for Coastal Management, School of Science, UNSW Canberra, Canberra, ACT, Australia; Delft Institute of Applied Mathematics, Delft University of Technology, Delft, Netherlands; Flanders Hydraulics Research, Antwerp, Belgium
推荐引用方式 GB/T 7714	Jalón-Rojas I.,Dijkstra Y.M.,Schuttelaars H.M.,et al. Multidecadal Evolution of the Turbidity Maximum Zone in a Macrotidal River Under Climate and Anthropogenic Pressures[J],2021,126(5).
APA	Jalón-Rojas I.,Dijkstra Y.M.,Schuttelaars H.M.,Brouwer R.L.,Schmidt S.,&Sottolichio A..(2021).Multidecadal Evolution of the Turbidity Maximum Zone in a Macrotidal River Under Climate and Anthropogenic Pressures.Journal of Geophysical Research: Oceans,126(5).
MLA	Jalón-Rojas I.,et al."Multidecadal Evolution of the Turbidity Maximum Zone in a Macrotidal River Under Climate and Anthropogenic Pressures".Journal of Geophysical Research: Oceans 126.5(2021).