中文摘要：

黄河口的海洋动力输沙能力受径流、潮流和波浪等动力条件的影响，是个十分复杂的问题。本文利用MIKE21模型建立了渤海水域大模型和黄河口水域的小模型，大模型为小模型提供外海边界条件。利用渤海水域验潮站的分潮资料对大模型进行了验证，计算值与实测值符合良好。黄河口水域小模型计算研究了多个人海流路口外水域的潮流过程和潮流输沙能力，计算结果得到黄河口水域新、老口门附近存在三个高流速区，最大潮流速在1．7m／s左右，自渤海湾向莱洲湾的强大沿岸流输沙是黄河口潮流输沙的主要形式，分析计算口外泥沙净通量得到刁口河、原河道和现行清8流路、马新河、北汉流路和十八户流路口外水域向口门两侧10km外和外海的输沙量占利津沙量百分数分别为51．04％、39．27％、29．94％、17．75％、12．96％和7．22％，年均输往外海沙量分别为3．00亿t,2.18亿t、1.66亿t,0.99亿t、0．72亿t和0．40亿t。计算得到的清水沟原河道的潮流输沙能力与多年资料分析结果基本一致。

英文摘要：

The sea-flow driven sediment transport capacity at Yellow River estuary is a complicated problem due to the dynamic interaction among river runoff, tidal current and waves. Two mathematical models for computing sediment transport and current are established based on the MIKE21 model. The range of the large model covers the whole Bohai Bay and the validity of the model is calibrated by the harmonic tidal components of observation data. According to the open boundary conditions from the large model, the tidal currents and sediment transport processes in the Yellow River estuary are studied by the small model. The computational results show that three high tidal current zones exist with maximum speed reaches 1.7m/s. The alongshore current from Bohai Bay to Laizhou Bay is the main force to transport sediment. The sediment transportation of different possible seagoing flow routes of the Yellow River are calculated which provides the data for scheme selection.