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• W2891183631 endingPage "955" @default.
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• W2891183631 abstract "The Yangtze (Changjiang) mega-delta, China, has a high risk of coastal erosion owing to the recent high rate of relative sea-level rise and reduced sediment supply. The study of the Holocene evolution of the delta can provide information about its response to rapid sea-level rise and changes in sediment supply caused by climate or human activity, although this has yet to be fully explored because of the lack of integrated studies using age-constrained sedimentary records. Here we document stratigraphic architecture and morphological changes over the last 11,700 years and estimate the amount of sediment trapped in the delta region on a millennial scale using a dataset of 344 sediment cores, 658 radiocarbon and 28 optically stimulated luminescence (OSL) ages (of which we obtained 64 cores, 345 radiocarbon and 28 OSL ages, and the others we sourced from the literature). Using this dataset we present the temporal and spatial morphodynamic evolution of the entire Yangtze River mouth from its early Holocene transgressive estuary to a mid- to late-Holocene regressive delta, making it possible to produce a quantitative and sequential analysis of sediment deposition. A destructive phase of the river mouth region was identified at 10 to 8 cal. kyr BP, including significant coastal erosion of tidal flats and troughs within the estuary and of tidal ridge-and-trough topography offshore; these resulted from the reshaping of the river mouth morphology caused by rapid sea-level rise at that time. As a result, the rate of sediment trapping at the river mouth declined from an average of 224 Mt yr−1 at 11.7–10 cal. kyr BP to 137 Mt yr−1 between 10 and 8 cal. kyr BP. Since delta initiation 8000 years ago, a retreat of the subaqueous delta occurred and the sediment trapping rate declined from 151 Mt yr−1 at 8–6 cal. kyr BP to 99–113 Mt yr−1 between 6 and 2 cal. kyr BP, caused by the reduction in sediment supply linked to summer monsoon weakening ~6000 years ago. In the last 2000 years the sediment trapping rate has increased to 162 Mt yr−1 due to intensified human activity. The present-day level of sedimentation in delta (49 Mt yr−1 in 2003–2011), after the completion of the Three Gorges Dam, is far lower than the ‘natural’ range in the Holocene. We thus infer a potential for system regime shift in terms of coastal erosion and a transition to a new equilibrium in delta morphology in the near future." @default.
• W2891183631 created "2018-09-27" @default.
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• W2891183631 date "2018-10-01" @default.
• W2891183631 modified "2023-10-17" @default.
• W2891183631 title "Three-dimensional evolution of the Yangtze River mouth, China during the Holocene: impacts of sea level, climate and human activity" @default.
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• W2891183631 doi "https://doi.org/10.1016/j.earscirev.2018.08.012" @default.
• W2891183631 hasPublicationYear "2018" @default.
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