Sediment Deposition in the Middle Reaches of the Yangtze River and the Development of the Yangtze River Delta in the Holocene: A Discuss on Flood Control Strategies in the Middle Reaches of the Yangtze River

CHEN Li-De

doi:10.3969/j.issn.2097-0013.2023.04.007

2023 Vol. 39, No. 4

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Article navigation > South China Geology > 2023 > 39(4): 666-671

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CHEN Li-De. 2023. Sediment Deposition in the Middle Reaches of the Yangtze River and the Development of the Yangtze River Delta in the Holocene: A Discuss on Flood Control Strategies in the Middle Reaches of the Yangtze River. South China Geology, 39(4): 666-671. doi: 10.3969/j.issn.2097-0013.2023.04.007

Citation:

CHEN Li-De. 2023. Sediment Deposition in the Middle Reaches of the Yangtze River and the Development of the Yangtze River Delta in the Holocene: A Discuss on Flood Control Strategies in the Middle Reaches of the Yangtze River. South China Geology, 39(4): 666-671. doi: 10.3969/j.issn.2097-0013.2023.04.007

Sediment Deposition in the Middle Reaches of the Yangtze River and the Development of the Yangtze River Delta in the Holocene: A Discuss on Flood Control Strategies in the Middle Reaches of the Yangtze River

CHEN Li-De

Wuhan Center, China Geological Survey (Geosciences Innovation Center of Central South China),Wuhan 430205, Hubei, China

Received Date: 15 March 2023

Revised Date: 28 March 2023

Abstract

Abstract

Since the Holocene transgression, a huge amount of sediment has accumulated in the Yangtze estuary, forming six subdelta estuarine bars from west to east. The estuary of the Yangtze River has also advanced southeast from Zhenjiang and Yangzhou to Changxing island. Coupled with the evolution and development of the Jingjiang and Paizhou bay meanders in the middle reaches of the Yangtze River over the past hundred years, the riverway of middle and lower reaches of the Yangtze River have extended 620 km in total. The automatic adjustment of the longitudinal slope of the riverbed in the middle and lower reaches of the Yangtze River resulted in 12.9 meters of sediment deposition in the middle reaches of the river. The continuous extension and lengthening of the Yangtze River channel and the automatic adjustment of the longitudinal slope of the alluvial riverbed in the middle and lower reaches of the Yangtze River are the internal causes of the silting and flood level rise in the middle reaches of the Yangtze River. The participation of human activities in the Jingjiang River strengthened the sediment transport downstream of the Yangtze River, accelerated the development of the Yangtze River delta and the extension of the river channel, and constituted a positive feedback mechanism of channel silting and flood level rise in the middle reaches of the river. Flood prevention and disaster reduction strategies for the middle reaches of the Yangtze River, flood control planning and territorial spatial planning should consider the dredging and desilting of the Yangtze Estuary and the utilization of sediment resources in the Yangtze River Delt, or opening up new flood control channels into the sea, such as the Nantong - Rudong new canal into the sea and new river for flood control.
- Holocene /
- middle reaches of Yangtze River /
- Yangtze River Delta /
- longitudinal gradient of river channel /
- silting /
- dredging

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