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河口入海泥沙沉积固结过程中抗侵蚀性的变化直接决定着沉积物的再悬浮和二次迁移,对河口岸滩的稳定具有重要决定作用。在现代黄河三角洲潮滩模拟入海泥沙快速沉积,现场测试不同固结时间沉积物的抗侵蚀性和物理力学指标的变化。研究发现,黄河入海泥沙沉积物的抗侵蚀性随固结时间增长迅速提高,当沉积固结时间达8h时,其临界侵蚀切应力就超过了原状潮滩表层沉积物;新沉积泥沙的临界侵蚀切应力与其重度、贯入阻力、剪切强度呈良好的正相关关系,与含水率呈良好的负相关关系。黄河入海泥沙临界侵蚀流速的试验值随固结时间的增长速率要高于各泥沙起动公式计算值的增长速率,前者是后者的1.5～4.1倍。
The change of erosion resistance during sediment consolidation in estuary directly determines the resuspension and secondary migration of sediments, which plays an important role in the stability of estuarine and beach. In the modern Yellow River Delta tidal flat simulating rapid sediment deposition into the sea, on-site testing of different consolidation time sediment erosion resistance and physical and mechanical changes. The results show that the erosion resistance of the sediments entering the sea rapidly increases with the increase of the consolidation time. When the deposition consolidation time reaches 8h, the critical shear stress exceeds the surface sediment of the original tidal flat. The newly deposited sediment The shear stress of critical erosion shows a good positive correlation with its severity, penetration resistance and shear strength, and shows a negative correlation with moisture content. The experimental values of the critical erosion velocity of sediment entering the Yellow Sea with the consolidation time are higher than the growth rates of the calculated values of the sediment start formulas, the former being 1.5-4.1 times of the latter.