深圳铜鼓航道回淤特征研究

Research on back siltation characteristics of Tonggu Channel in Shenzhen

文章基于深圳铜鼓航道实测回淤监测资料,研究了铜鼓航道段的回淤特征,探讨了航道回淤机理。研究结果表明:(1)铜鼓航道沿程回淤分布曲线出现两个锋值,回淤主峰值位于K21里程以北区段,次峰值位于K10~K16里程区段,K7~K9里程区段、K17~K18里程区段回淤较小;(2)铜鼓浅滩滩面泥沙及上游来沙是铜鼓航道回淤泥沙的主要来源,航道回淤的主要形式为悬沙落淤;(3)铜鼓航道K21以北航道回淤较大与铜鼓浅滩东部河口峰的存在导致泥沙易于落淤;(4)受洪季上游来沙量大、台风浪较大的影响,铜鼓航道洪季淤强相对较大。

Based on underwater topography data of Tonggu Channel in Shenzhen,the back silting characteristics of Tonggu Channel in Lingding Bay were analyzed in this paper.Sediment supply and the cause mechanism of the back siltation were studied finally.The main research conclusions were showed as follows:There were two peaks in the curves of siltation value along Tonggu Channel.The main peak value was located at north of K21 section of the channel,and the sub-peak value was located at K10~K16 sections of the channel.The siltation value at K7~K9 sections and K17~K18 sections were relatively small.Sediment from Tonggu Shoal and river sediment load were the main sedimentary sources of Tonggu Channel,and the sediment deposited in the channel was mainly came from the suspended sediment transporting by the tidal current.The greater siltation at north of K21 section of Tonggu Channel was related to the silting process caused by the estuary front at the eastern Tonggu Shoal.During flood season,impacted by the increasing sediment load from the Pearl River and typhoon waves,the back silting intensity of Tonggu Channel was relatively large throughout a year.