华南地质2023，Vol.39Issue(4)：666-671,6.DOI:10.3969/j.issn.2097-0013.2023.04.007
长江中游泥沙淤积与全新世长江三角洲的发育
Sediment Deposition in the Middle Reaches of the Yangtze River and the Develop-ment of the Yangtze River Delta in the Holocene:A Discuss on Flood Control Strategies in the Middle Reaches of the Yangtze River
摘要
Abstract
Since the Holocene transgression,a huge amount of sediment has accumulated in the Yangtze estu-ary,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 au-tomatic 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 exten-sion 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 devel-opment 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 di-saster 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 sedi-ment 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.关键词
全新世/长江中游/长江三角洲/河道纵比降/泥沙淤积/浚海清淤Key words
Holocene/middle reaches of Yangtze River/Yangtze River Delta/longitudinal gradient of river channel/silting/dredging分类
地理科学引用本文复制引用
陈立德..长江中游泥沙淤积与全新世长江三角洲的发育[J].华南地质,2023,39(4):666-671,6.基金项目
中国地质调查局项目(1212010013500150005) （1212010013500150005）
