台州头门港进港航道试挖槽回淤分析

Siltation in trial excavated channel of approach channel of Toumen Port,Taizhou

通过对台州头门港进港航道试挖槽开挖后历次水下地形和断面监测资料进行分析,得出试挖槽回淤特征,并探讨回淤机理。结果表明:13个月的监测期内,试挖槽经历了自然缓慢回淤→骤淤冲刷交替→自然缓慢冲刷的发育过程,最终达到动态平衡稳定,试挖槽平均水深基本满足11.7 m的设计通航水深要求。正常天气条件下,悬沙落淤是试挖槽的主要回淤形式;大风天气条件下,台风的风浪掀沙作用使试挖槽发生骤淤,槽内发育浮泥层,寒潮的作用微弱。

Upon the analysis of the monitoring data on underwater topography and cross-sections after the trial excavated channel of the approach channel of Toumen Port in Taizhou,we obtain the siltation characteristics of the trial excavated channel and discuss the siltation mechanism.The results show that during the monitoring period of 13 months,the trial excavated channel experiences the development process of natural and slow back-silting to alternating sudden silting and scouring to natural and slow scouring,and finally reaches a dynamic equilibrium and remains stable.The average water depth of the trial excavated channel meets the design navigation water depth requirements of 11.7 m.Under normal weather conditions,suspended sediment deposition is the main form of siltation in the trial excavated channel.Under strong wind conditions,the sediment-lifting effect of typhoons causes sudden siltation in the trial excavated channel,and a floating mud layer develops in the channel;the cold-air outbreak has a weak effect.