【摘要】 近岸海域是海陆相互作用的敏感地带，受自然和人类活动的共同影响，沉积动力环境较为复杂。海底表层是水体和海底交互作用的关键界面，表层沉积物侵蚀特征是影响海底冲淤演化的重要因子。本文利用于2021年10月在曹妃甸南部海域获取的91个表层沉积物样品及10个原状插管样，通过粒度实验、室内U-GEMS微观侵蚀实验，分析了研究区表层沉积物临界侵蚀剪应力及侵蚀速率的空间分布特征，结合潮流数值模拟结果，探讨了潮流作用下研究区表层沉积物侵蚀特征。结果表明：表层沉积物临界侵蚀剪应力介于0.3～0.6 N/m²，曹妃甸周边区域表层沉积物临界侵蚀剪应力为0.45～0.6 N/m²，研究区东部及南部表层沉积物临界侵蚀剪应力相对较小，为0.3～0.45 N/m²。侵蚀速率随剪应力的增大总体呈线性增加趋势，侵蚀速率最大值为0.059 g·m^-2·s^-2。研究区内表层沉积物侵蚀特征受到潮流作用和表层沉积物可侵蚀性的影响。该研究有利于从沉积物侵蚀特征方面丰富近海冲淤演化理论，对于近岸工程建设和海岸防护具有一定指导意义。更多还原

【Abstract】 The offshore area is a sensitive area of land-sea interaction.Due to the combined influence of natural and human activities,the sedimentary dynamic environment is more complex.The seabed surface is the key interface for the interaction between water and seabed,and the erosion characteristics of surface sediments are important factors affecting the evolution of seabed erosion and deposition.Based on the surface sediment samples of 91 stations and 10 undisturbed intubation samples in the southern sea area of Caofeidian in October 2021,the spatial distribution characteristics of critical erosion shear stress and erosion rate of surface sediments in the study area were analyzed by particle size experiment and indoor U-GEMS micro-erosion experiment.Combined with the numerical simulation results of tidal current,the erosion characteristics of surface sediments in the study area under the action of tidal current were discussed.The results show that the critical erosion shear stress of surface sediments in the area around the Caofeidian head is larger,and the critical erosion shear stress in the southern part of the study area is relatively small.The critical erosion shear stress of surface sediments is between 0.3 and0.6 N/m².The erosion rate increases linearly with the increase of shear stress,and the maximum erosion rate is 0.059 g·m^-2·s^-1.The erosion characteristics of surface sediments in the study area are affected by tidal current and the erodibility of surface sediments.The research results are helpful to enrich the theoretical research results of offshore erosion and deposition evolution from the aspects of sediment erosion characteristics,and have certain guiding significance for offshore engineering construction and coastal protection.更多还原