Holocene delta evolution and sediment flux of the Pearl River, southern China

ABSTRACT Delta progradation and sediment flux of the Pearl River Delta (PRD), southern China, during the Holocene are presented based on analyses of borehole data on the delta plain. Results indicate that the delta prograded into the drowned valley because of early Holocene inundation from 9 to 6 ca...

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Veröffentlicht in:Journal of quaternary science 2016-05, Vol.31 (5), p.484-494
Hauptverfasser: Wei, Xing, Wu, Chaoyu, Ni, Peitong, Mo, Wenyuan
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container_title Journal of quaternary science
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creator Wei, Xing
Wu, Chaoyu
Ni, Peitong
Mo, Wenyuan
description ABSTRACT Delta progradation and sediment flux of the Pearl River Delta (PRD), southern China, during the Holocene are presented based on analyses of borehole data on the delta plain. Results indicate that the delta prograded into the drowned valley because of early Holocene inundation from 9 to 6 cal ka BP, as sea‐level rise decelerated. The sea level reached its present level at about 6 cal ka BP and, as a consequence, a large portion of the drowned valley was covered by the estuary, with more than 160 rock islands and platforms. The scattered landmasses promoted active deposition and acted as deposition nuclei during deltaic evolution. Consequently, apart from exhibiting a general tendency towards progression, PRD development occurred less regularly over time and space because of deposition around island boundaries. During the last 2 ka, mainly because of significantly increased human activities, which have trapped sediments in the encircled tidal flats along the front of delta plains, the shoreline has advanced rapidly. Estimated sediment fluxes for the three periods (9–6, 6–2 and 2–0 cal ka BP), based on the sediment volume analysis, were 17–25, 22–30 and 44–58 million t a−1, respectively.
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Quaternary Sci</addtitle><description>ABSTRACT Delta progradation and sediment flux of the Pearl River Delta (PRD), southern China, during the Holocene are presented based on analyses of borehole data on the delta plain. Results indicate that the delta prograded into the drowned valley because of early Holocene inundation from 9 to 6 cal ka BP, as sea‐level rise decelerated. The sea level reached its present level at about 6 cal ka BP and, as a consequence, a large portion of the drowned valley was covered by the estuary, with more than 160 rock islands and platforms. The scattered landmasses promoted active deposition and acted as deposition nuclei during deltaic evolution. Consequently, apart from exhibiting a general tendency towards progression, PRD development occurred less regularly over time and space because of deposition around island boundaries. 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subjects delta evolution
Deltas
Deposition
Evolution
Flux
Holocene
Islands
Pearl River
Rivers
Sea level
sea-level change
sediment flux
Sediments
Valleys
title Holocene delta evolution and sediment flux of the Pearl River, southern China
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