海洋地质前沿2024，Vol.40Issue(1)：44-54,11.DOI:10.16028/j.1009-2722.2022.311
新情势下长江河口南槽河床冲淤演变特征
Evolution in river regime in the South Passage of the Yangtze Estuary under new situation
摘要
Abstract
With the sharp decrease of sediment flow in the Yangtze River basin,the construction of estuary for-aging projects,the strengthening of ecological environmental protection,and the efficient utilization of navigation environment,the Yangtze River estuary is facing a new round of adjustment.Taking the evolution of the South Passage of the Yangtze River Estuary as the research object,the recent river regime changes of the South Passage were studied based on the underwater topography data and the channel water depth data of the South Passage in the past 10 years,and the effects of the first phase of the South Passage regulation project were discussed.Results show that the main channel of the South Passage presented a scouring trend as a whole from 2010 to 2018,and the tidal creek at the head of Jiangyanan Shoal developed and the tail of Jiangyanan Shoal were scoured down.The tidal creek at the head of Jiangyanan Shoal has changed from scour to siltation environment from 2018 to the present,while the scour and siltation situation in other areas remains unchanged.The shape of the main channel in the South Passage section is generally stable.Under the background of the overall erosion of the main channel,the"barrier gate sand"was gradually flattened.Coupled with the role of the first phase of the South Passage regula-tion project,the volume of the area in the depth greater than 6 m has been significantly expanded and maintained good stability.The recent change of the South Passage regime is the comprehensive outcome of the influences of water and sediment inflows,and estuarine natural and human activities.The first phase of South Passage regula-tion project has played an important role in the recent topographic changes in Jiangyanan Shoal.The project ef-fectively controlled the river regime of Jiangyanan Shoal and restrayed the local scour development trend of Ji-angyanan Shoal,which is conducive to stabilizing the north boundary of the South Passage channel.关键词
长江口/南槽/河势变化/南槽航道治理一期工程/江亚南沙Key words
Changjiang Estuary/South Passage/river regime evolution/the first phase of South Passage regula-tion project/Jiangyanan Shoal分类
海洋科学引用本文复制引用
左书华,赵德招,谢华亮,赵张益,杨华..新情势下长江河口南槽河床冲淤演变特征[J].海洋地质前沿,2024,40(1):44-54,11.基金项目
交通运输部重大科技创新项目(2020CX005) （2020CX005）
交通运输行业重点科技项目(2022-MS5-133) （2022-MS5-133）
国家重点研发计划项目(2019YFB1600605) （2019YFB1600605）
