| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
ZUO Shuhua, YANG Chunsong, FU Gui, XIE Hualiang. Variation of water and sediment flux and its influence on the Yangtze River Estuary[J]. Marine Geology Frontiers, 2022, 38(11): 56-64. doi: 10.16028/j.1009-2722.2022.076
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Variation of water and sediment flux and its influence on the Yangtze River Estuary
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Abstract
Based on the runoff and sediment discharge data of Datong Station from 1960 to 2020, the seasonal and interannual variations and trends of seawater and sediment flux into the Yangtze River estuary were studied, and the influencing factors and their effects were discussed. Results show that during the data coverage period: the annual average runoff was 890.6 billion m3, and the annual average runoff fluctuated around the annual average with no obvious variation trend; seasonal variation of runoff into the sea was obvious, and the annual runoff from May to October accounted for 70.3% of the whole year; the annual average sediment transport was 335 million tons, and the sediment transport process showed generally a decreasing trend; the change of sediment flux into the Yangtze River estuary was obviously affected by the factors of water and soil conservation and reservoir construction. After the impoundment of the Three Gorges Reservoir, the sediment flux at Datong Station decreased by 62.8% compared with that before; the river regime of the Yangtze River estuary had also changed obviously due to the decrease of sediment flux in the Yangtze River basin. The sediment concentration in the estuary decreased significantly, the estuary changed from siltation environment to scour environment, the subaqueous delta front of the Yangtze River estuary occurred the large area of scour, and the estuary sandbar and the subaqueous delta sediment supply occurred the structural change of "sourcing-sink transformation".
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Keywords:
- Yangtze River Estuary /
- Datong Station /
- runoff /
- sediment transport /
- Three Gorges Reservoir
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References
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ZUO Shuhua, YANG Chunsong, FU Gui, XIE Hualiang. Variation of water and sediment flux and its influence on the Yangtze River Estuary[J]. Marine Geology Frontiers, 2022, 38(11): 56-64. doi: 10.16028/j.1009-2722.2022.076
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Figure 1.
Situation map of the study area
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Figure 2.
Annual runoff process at Datong Station of the Yangtze River
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Figure 3.
Cumulative frequency of annual runoff at Datong Station of the Yangtze River
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Figure 4.
Variation of average monthly runoff at Datong Station
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Figure 5.
Monthly runoff changes at Datong Station in different periods
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Figure 6.
Process of annual sediment discharge at Datong Station in recent years
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Figure 7.
Variation in perennial mean of monthly sediment transport at Datong Station
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Figure 8.
Monthly sediment transport at Datong Station in different periods
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Figure 9.
Proportion of monthly sediment transport to annual sediment transport at Datong Station in different periods
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Figure 10.
Process of monthly runoff at Datong Station and monthly net tidal discharge at Xuliujing Station （2005—2010）
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Figure 11.
Relationship between monthly runoff at Datong Station and monthly net tidal discharge at Xuliujing Station （2005—2010）
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Figure 12.
Relationship between monthly sediment transport at Datong station and monthly net sediment discharge at Xuliujing Station （2009—2010）
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Figure 13.
Comparison in sediment concentration in flood season between 2003 and 2007 in the Yangtze River estuary[28]
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Figure 14.
Change of scouring and silting trend in the Yangtze River estuary in different periods[27]
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Figure 15.
Changes of scouring and silting in the Yangtze River estuary from 1997 to 2016[28]
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Figure 16.
Variation of median grain size of suspended sediment in the Yangtze River estuary in different periods[28]