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- W2495662009 abstract "The middle Qiantang Estuary breeds the world's biggest tidal bores. It has unique morphodynamics and sediment facies which have been studied using a time series of field photographs, satellite images and by using the textural and structural composition of 23 short cores from two tidal flats along the north and south banks. The results show that the channel morphology is extremely mobile in terms of rapid growing and shifting of intertidal banks over both short-term and large spatial scales because channel sediments, dominated by fine sand and coarse silt, are easily resuspended and dispersed by shooting flood flows due to energetic tidal bores and by strengthening river runoff during rainy seasons. This generally favours sediment dispersal upstream, accumulation along the north bank and the consequent development of extensive intertidal flats during dry seasons, while sediment dispersal downstream develops extensive intertidal flats along the south bank during rainy seasons over multiyear periods. Four sedimentary facies are identified across the channel: (1) tidal-bore deposits (TBDs) in the main channel and on the lower tidal flat, (2) hybrid deposits (HDs) near the mean low-water neaps, (3) tidal rhythmites (TRs) with (incomplete) spring-neap tidal cycles on the middle to upper tidal flats and (4) annual rhythmites (ARs) on the upper tidal flat and marshland. A typical TBD consists of at least two of the following sedimentary features: (1) erosion surface, (2) massive bedding, (3) graded bedding, (4) parallel lamination and (5) soft-sediment deformation structures. TBDs also differ from tidal sand deposits (TSDs) in having a coarser grain-size and poorer sorting because of rapid deposition. The well-developed TRs with (incomplete) spring-neap tidal cycles are attributed to three favourable conditions: (1) abundant sediment supply from the main channel resuspended and dispersed by tidal bores and rapid flood flows, (2) a relative protected setting with regard to wave attack and (3) very rapid accretion of intertidal flats over a short-term scale. Consequently, a stacked facies succession of TBDs, HDs and TRs is assumed as the best indicator for a tidal-fluvial transition with tidal bores." @default.
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- W2495662009 date "2016-02-19" @default.
- W2495662009 modified "2023-09-22" @default.
- W2495662009 title "Morphodynamics and sedimentary facies in a tidal-fluvial transition with tidal bores (the middle Qiantang Estuary, China)" @default.
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- W2495662009 doi "https://doi.org/10.1002/9781119218395.ch5" @default.
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