中文摘要：

海岸水下大尺度地貌单元的形成机制、迁移与变化过程是海洋科学研究的重要内容，本文从水下大尺度地貌单元的原型观测分析、动力地貌的形成过程和地貌的模拟与迁移预报等方面对此类地貌问题的研究进行了综述。在此基础上，结合杭州湾北岸侵蚀／淤积波的沉积环境，提出对大河河口近岸水下大尺度地貌的研究应突出“泥沙”这个关键因素，考虑流域与海岸的互动，综合探讨地貌单元迁移对人文因素与自然作用的响应与行为。

英文摘要：

The formation mechanism, migration and change process of large-scale submarine geomorphological （LSSG） unit is one of the important subjects in the study of ocean sciences. Based on the observation and analysis of LSSG, Morphodynamic process and geomorphological simulation and migration prediction, the study on these geomorphlologieal issues are summarized. Combined with the sedimentary environment of erosion/deposition waves in the northern bank of Hangzhouwan Bay, ＂silt＂, the key factor in this process is emphasized in the study of LSSG. Taking the interaction between the drainage basin and coast, the behavior and influence of the LSSG migration in response to the anthropogenic factors and natural action are discussed.