黄河口挑河河口悬沙分布与输移特征研究

Distribution and transport characteristics of suspended sediment in the estuary of the Tiaohe River in the Yellow River Estuary

基于实测资料对黄河废弃河道挑河河口段的悬沙分布及输移特点进行了研究。结果表明:挑河河口段悬沙浓度与潮流流速正相关,风浪作用则导致悬沙质量浓度大大提高;在空间尺度上悬沙浓度呈河口高、河道上游低的特点;挑河河口附近,涨潮流输沙明显占优势,向河道内侧,悬沙输移率有所降低,且逐渐转变为落潮输沙占优势。结合河口外侧海域冲淤演变趋势以及悬沙输运动力机制,认为河口段河道总体处于弱淤积状态,而风浪作用可以加速河道淤积。本研究可为挑河的河口演变和航道整治等提供参考。

The distribution and transport characteristics of suspended sediment in the abandoned Tiaohe River Estuary of the Yellow River were analyzed. The results show that the suspended sediment concentration（SSC） in estuary is higher than that in river upstream on the spatial scale, and there is a strong positive correlation between the SSC and tidal current velocity, and wind wave can greatly improve SSC; flood current transport sediment dominates near the mouth of the Tiaohe River,; the suspended sediment transport rate becomes smaller inside, and the ebb tide transport sediment dominates gradually. Combined with the silting evolvement trend and suspended sediment transport mechanism, we can conclude that the Tiaohe River is weak deposited and wind wave can accelerate the deposit.