三甲港闸下引河水沙过程分析

为掌握引河延长后闸前水域的水沙变化,以2015年6月17—19日洪季大潮期间三甲港下游引河内定点水沙测验资料为基础,结合周边岸线变化,系统分析水闸开、关运行时的水沙过程。结果表明:近年来周边整治工程陆续实施,闸下引河外推约1. 3 km,引河内受停靠船舶及出水浅滩影响形成双滞流区;闸前引河受潮汐控制,潮流为旋转流;关闸期间引河内水动力较弱,引河上游流速不足0. 1 m/s,泥沙向上游输移;开闸期间瞬时下泄流速、含沙量呈单峰分布,流速衰减较快。

Analysis on hydrodynamic and sedimentary processes of intake channel in downstream reach of Sanjia Port sluice

In order to master the hydrodynamic and sedimentary variation of the water area front the sluice after the extension of intake channel,we systematically analyze the hydrodynamic and sedimentary processes with the changes of the surrounding shoreline when the sluice is opened and closed,which are based on the fixed-point observed data during the flood season and spring tide (June 17-19,2015) in the intake channel of the downstream reach of Sanjia Port sluice.The results show that,with the regulation projects being constructed recent years,the reach has been propagated downstream about 1.3 km,and there are double low-velocity zones in the intake channel caused by berthing ships and shoal.The intake channel front sluice is controlled by tide,and tidal current is rotational flow.The hydrodynamic of intake channel is weak when the sluice is closed,and the velocity in upstream reach is slower than 0.1 m/s.The sediment transports to upstream.The distributions of sediment concentration and the instantaneous flow velocity are both single peak when the sluice is opened,but the velocity decays rapidly.