淤泥质海岸复杂环境深水航道设计要点分析

Analysis on Design Essentials of Deepwater Channel Under Condition of Complex Silty Coast

淤泥质海岸新辟港区深水航道建设受水流泥沙运动、相邻工程及周边港口影响较大。以天津港南港航道为例,从泥沙运动特性、航道轴线选择、通航水流条件、航道泥沙回淤、分段主尺度设计、河口闸下泄流对港内泥沙淤积影响、海底管线与航道交叉段预留方案等多个方面进行研究,并提出了一种“余时淤积”原理的施工期回淤量简化计算方法。研究成果已成功应用于实际工程,项目顺利建成且通航运营良好,验证了其有效性。本文提出的解决思路和设计方案可为类似项目提供参考。

The construction of deepwater channel approaching to new harbor with silty coast is greatly affected by the movement of water current and sediment,adjacent projects and ports.Nangang channel approaching to Tianjin Port is analyzed from the aspects of sediment movement characteristics,channel axis selection,water current conditions for navigation,sediment back-silting in channel,segmental design of main dimensions,the effect of discharge under estuary sluice on sediment silted at harbor,and the solutions for the sections where submarine pipelines cross with the channel.A simplified method for calculating the amount of back-silting during construction is proposed based on residual silting principle.The research results have been successfully applied in engineering practice,and the project completed as scheduled and good navigable situation verify the research effective.The proposed design idea and strategy will provide a reference for similar projects.