摘要
江苏沿海辐射沙脊群在国内潮成沙体中较为罕见,有关辐射沙脊形成的动力机制已有定论,但对其形成时间和物质来源说法不一。运用长时间尺度动力地貌过程数学模型复演了辐射沙脊群形成演变过程,结果表明:江苏岸外辐聚辐散的流场不依赖于局部海底地形而独立存在;不同初始地形下只要泥沙供给充足,经过150年左右潮流动力对地形不断塑造,辐射状"水道-沙脊"相间的地貌格局都能基本形成;辐射沙脊群是废黄河北归约150年后,随着废黄河水下三角洲不断被侵蚀,辐聚辐散的潮流对不同来源物质重新塑造的结果,是动力-泥沙-地形相互作用的产物。
The radial sand ridges (RSRs) along the coast of Jiangsu Province are a rare form of tidal sand body. Some inferences have been made on the hydrodynamic mechanisms of radial sand ridges formation;however,opinions on their formation time and sediment origin source differ. In this study,the formation and evolution of radial sand ridges were simulated by a long-time-scale dynamic geomorphological model. The results showed that the convergence and divergence of sand flow field outside the coast of Jiangsu province existed independently without the influence of seabed topography. In different initial topographies,the radial “channel-sand ridge” geomorphological pattern is formed by tidal power in around 150 years as long as there is sufficient sediment supply. Because the abandoned Yellow River flowed northwards 150 years ago,the Yellow River underwater delta continues to be eroded. The radial sand ridges are the result of redistribution of different sediment sources from convergence and divergence flow and are the products of dynamic-sediment-topographic interaction.
作者
陈可锋
郑金海
陆培东
王艳红
张弛
王乃瑞
CHEN Kefeng;ZHENG Jinhai;LU Peidong;WANG Yanhong;ZHANG Chi;WANG Nairui(State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210024,China;River and Harbor Engineering Department,Hohai University,Nanjing 210098,China)
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2019年第2期230-242,共13页
Advances in Water Science
基金
国家杰出青年基金资助项目(51425901)
国家重点研发计划资助项目(2018YFC04070501)~~
关键词
辐射沙脊群
废黄河三角洲
地貌模型
长时间尺度
南黄海
radial sand ridges
Abandoned Yellow River Delta
geomorphological model
long-time-scale
South Yellow Sea
