摘要
黄河携带大量泥沙入海,底床沉积物在波、潮、流等水动力条件作用下会不断地发生再悬浮与输运,形成黄河三角洲海底面的动态变化过程。利用自主研发的电阻率探杆三脚架,观测了水动力作用下海床面的侵蚀与淤积过程。研究结果显示,研究区涨落潮过程中海水浊度的变化主要受波高的影响,近底床位置海水浊度的变化趋势是涨潮过程中海水浊度上升,落潮过程中海水浊度降低。侵蚀或淤积是海床面泥沙的再悬浮与悬沙沉降共同作用的结果。研究区冬季的海床面变化以侵蚀为主,当沉降作用强于侵蚀淤积作用时,即使海床所受切应力大于沉积物临界切应力,海床仍发生淤积。
The Yellow River carries a large amount of sediment into the sea,and the bed sediment will be scoured and transported continuously.Variability of near-bed suspended sediment concentration and the processes of scour and deposition in the Yellow River Delta are still questions.It is investigated that the suspension,scour and deposition of seabed sediment based on data on the monitored electrical resistivity.It is showed that the fluctuation of seawater turbidity is mainly affected by the effective wave height.The general trend of seawater turbidity at the near-bed position is that the turbidity of seawater rises during the tide,and the turbidity decreases during the ebb.The process of seabed on research area in the winter is dominated by erosion.The erosion and deposition are affected by sediment suspension and settlement of suspended sediment.When the hydrodynamic effect declined to a threshold value,the effect of suspended sediment settlement is stronger than sediment suspension,even if the shear stress on the seabed is greater than critical shear stress of sediments,the seabed will be deposited.
作者
李博闻
贾永刚
张颖
单红仙
LI Bo-wen;JIA Yong-gang;ZHANG Ying;SHAN Hong-xian(Institute of Geo Environmental Engineering,Ocean University of China,Qingdao 266100,China;Qingdao National Laboratory for Marine Science and Technology,Qingdao 266100,China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Qingdao 266100,China)
出处
《泥沙研究》
CSCD
北大核心
2020年第2期16-22,共7页
Journal of Sediment Research
基金
国家自然科学基金项目(40876042,41072215)。
关键词
黄河口三角洲
床面沉积物
悬沙浓度
侵蚀淤积过程
原位观测
Yellow River Delta
seabed sediment
concentration of suspended load
processes of erosion and deposition
in-situ observation
