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- W2364155547 abstract "Based on the hydrologic data observed at Datong station in 1950～2000 and the topographic map of Yangtze estuary, the effect of the changes in incomin g flow and sediment on the development of underwater bars in the estuary reach o f Yangtze river was comparatively analysed. Since 1960s, the flow and sediment i ncoming from the upstream Yangtze river have had a decreasing trend, especially in 1990s, the incoming sediment decreased by 34.3% compared with that in 1960s. In the recent about 50 years, the Yangtze river’s runoff amount into the Dongh ai sea remained basically unchanged, and in 1990s. it also increased slightly. T he river’s decreasing sediment and unchanged runoff caused the relative increas e in scouring capability of the runoff, resulting in the erosion of underwater b ars and the growth of channel volume. Through comparing the current areas of bar s above the -5 m elevation with their maximum areas in the developing process, B aimao bar’s area above the -5 m elevation decreases by 46.6%, and for “three b ars”, the bar area decreases by 20%, for Qingcao bar and Ruifeng bar, their are a decreases by 49.3%. In the same period of time, the cross-sectional areas of v arious channels in the estuary area below the 0 m elevation constantly increase. In addition, analyzing the time for underwater bars to return from siltation to erosion shows that long-term decreasing incoming sediment results in retrogress ive erosion in the estuary area and the downstream reach of the estuary area is affected early." @default.
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- W2364155547 date "2005-01-01" @default.
- W2364155547 modified "2023-09-23" @default.
- W2364155547 title "Preliminary analysis for influence of flow and sediment variation on underwate r bar growth in the estuary of the Yangtze river" @default.
- W2364155547 hasPublicationYear "2005" @default.
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