长江口深水航道回淤物理过程分析及减淤思路探讨

Physical processes of siltation in the Yangtze Estuary Deepwater Navigation Channel and its discussion on sediment reduction

长江口深水航道治理工程在取得巨大成功的同时,也为深化河口演变和河口治理的理论认识提供了丰富的经验。文章对河口拦门沙及最大浑浊带的生成机制及界定、泥沙密度层化、河口平衡剖面下的输沙特征、径流与丁坝工程对平衡剖面的影响、反映纵向环流影响的河口水团滞留时间(水龄)、航道回淤物理过程等的研究成果进行了归纳梳理,并在此基础上提出了进一步减淤的思路。

The Yangtze Estuary Deepwater Navigation Channel Regulation Project has achieved a great success, and it also provides a rich experience for deepening our understanding of estuary evolution and estuary regulation. The physical processes, related to mouth bar and turbidity maximum zone formation mechanism and definition, sediment density stratification and estuarine sediment transport, the cross-sectional equilibrium profile shape impacted by runoff and spur engineering, estuarine water retention time （water age） reflecting the influence of the longitudinal circulation currents, and channel siltation, were summarized in the study. Then the further prospect and discussion of sediment reduction strategy were proposed.