中文摘要：

为探讨外航道回淤特征，采用二维波浪潮流泥沙数学模型，模拟研究了莱州湾东部航道回淤情况并探讨了其影响因素，以期对航道泥沙输运研究提供借鉴。研究表明，正常天气下，水流跨越航道，流速减小、挟沙能力下降导致的悬沙落淤是航道淤积的主要原因，但淤积量有限。大风浪是造成航道淤积的主要动力因素，其淤积泥沙主要来源于海底侵蚀来沙，河流来沙和沿岸输沙对航道淤积的贡献不大。从水深地形、泥沙来源、底质类型、水文动力条件等方面分析，航道发生骤淤的可能性较小。

英文摘要：

To explore the characteristics of the outer channel siltation, we studied the siltation and influencing fac- tors of the outer channel in the Laizhou Bay by using a 2-D mathematical modeling of sediment transport under the co-action of waves and tidal currents. The research results can provide a study reference for the sediment transport of channel. Under normal weather, the main cause for channel siltation is the silting of the suspended sediment resulted from the decrease in current speed and carrying capacity when the water flows across the channel. The Sediment thickness is limited under normal weather. The large waves are the major power causing factor of siltation of waterways. The sediment of channel is mainly from the erosion sediment of seabed. Rivers and coastal sediments contribute little to the deposition of the channel. Based on the analysis of the topography, sediment sources, sedi- ment type, and hydrological conditions, sudden siltation is less likely to occurr.