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淤泥质粉砂海岸的主要成分为粉砂，具有黏土和砂的双重特征，其起动特性复杂且高度不确定，直接影响海岸港池和航道的冲淤，因此备受关注。通过采集大丰港深水航道的回淤土样本，使用双向环形水槽开展了淤泥质粉砂在特征临底起始含沙浓度和不同固结时间条件下的起动侵蚀试验。研究结果表明，淤泥质粉砂临界剪切应力与临底起始含沙量和固结时间均呈正相关关系，并且床面表层密度与临界剪切应力存在的线性关系会受到固结程度的显著影响。试验结果为今后进一步研究淤泥质粉砂海岸地区冲淤变化提供了理论和数据支撑。
Abstract：The muddy silt coast primarily consists of fine silt, exhibiting a dual characteristic of clay and sand. Its characteristics of incipient motion are complex and highly uncertain, directly affecting the erosion and sedimentation in coastal harbors and navigation channels, thus garnering continuous attention. By collecting sediment samples from the main channel of Dafeng Deep Channel(DDC), experiments on the incipient motion and erosion of mud-silt sediment were conducted in a rotating annular flume under different consolidation times. The research findings indicate that the critical shear stress of mud-silt sediment is positively correlated with the initial sediment concentration near to the bed and consolidation time. Moreover, the linear relationship between surface bed density and critical shear stress is significantly influenced by consolidation. These experimental results provide theoretical and data support for further studies on the erosion and sedimentation changes in mud-silt coastal areas.
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基本信息:
DOI：10.16239/j.cnki.0468-155x.2025.03.011
中图分类号:TV149;P731.2
引用信息:
[1]邵宇阳,李天宇,唐玉林,等.不同固结条件下淤泥质粉砂海岸泥沙起动特性试验研究[J].泥沙研究,2025,50(03):74-80.DOI:10.16239/j.cnki.0468-155x.2025.03.011.
基金信息:
国家自然科学基金联合基金重点项目(U2040203); 上海市水务局科研项目(沪水科2020-02)
2024-05-06
2024
2025-05-06
2025
2
2025-05-07
2025-05-07
2025-05-07