长江口横沙浅滩冲淤演变特征分析
Analysis of the characteristics of erosion and accumulation evolution of the Hengsha Shoal in the Yangtze River Estuary
冯祎琳 1张行南 1徐双全 2李万春 2方园皓 1刘羽婷3
作者信息
- 1. 河海大学 水文水资源学院,江苏 南京 210098;河海大学 水安全与水科学协同创新中心,江苏南京 210098
- 2. 上海市水务局,上海 200050
- 3. 长江水利委员会水文局 长江口水文水资源勘测局,上海 200136
- 折叠
摘要
横沙浅滩作为长江口前沿滩涂湿地的重要组成部分,是"上海市长远发展战略空间"的预留区,掌握其滩涂演变规律对该地区的资源保护及合理开发具有重要的参考价值.基于2005-2021年长江口实测水下地形数据,定量分析研究了横沙浅滩地形演变过程,及其对周边河口工程建设和水沙条件变化的响应.研究结果表明:横沙浅滩近年来整体呈现"长高长不大"的演化格局,中、东部区域明显淤高,沙体向海延伸与河口泥沙滞流点的向外海移动关系紧密.流域输沙量锐减是横沙浅滩滞涨的重要原因,滩面北沿和深水航道北侧冲刷明显,造成N23堤顶冲坑的扩大与滩面潮水沟的贯通.深水航道工程与横沙东滩促淤圈围工程的建设是潮水沟与N23堤顶冲坑迅速发育的主要原因.
Abstract
As an important component of the Yangtze River Estuary's forefront tidal flat wetland,the Hengsha Shoal is a reserved area for the"long-term development strategic space"of Shanghai.Understanding its tidal flat evolution pattern is of great reference value for resource protection and rational development in the region.Based on the underwater topographic data from 2005 to 2021 of the Yangtze River Estuary,this study quantitatively analyzes the geomorphic evolution process of the Hengsha Shoal and its response to surrounding estuarine engineering construction and changes in water and sediment conditions.The research results indicate that in recent years,the overall evolution pattern of the Hengsha Shoal shows a trend of"elongation without enlargement",with significant accumulation in the central and eastern regions.The extension of the sand body towards the sea is closely related to the outward movement of the estuarine siltation point.The sharp decrease in sediment transport in the basin is a significant reason for the shoal's stagnation.Erosion is evident along the northern edge of the shoal and the north side of the deep-water channel,leading to the expansion of erosion pits on the N23 embankment and the connection of tidal creeks on the shoal surface.The construction of the deep-water channel project and the Hengsha East Shoal's siltation-promoting enclosure project are the main reasons for the rapid development of tidal creeks and erosion pits on the N23 embankment.
关键词
冲淤演变/ArcGIS/长江口/横沙浅滩/河口工程Key words
erosion and accumulation evolution/ArcGIS/Yangtze River Estuary/Hengsha Shoal/estuarine engineering引用本文复制引用
基金项目
上海市水务局科研项目(Z3101001RIR000028001)
出版年
2024
NETL
NSTL
万方数据