伶仃航道三期试挖槽工程实施后泥沙回淤分析

在对伶仃洋河口湾来水来沙、潮汐与潮流特性分析的基础上,结合伶仃航道三期工程实施后的4次航道地形测量资料,对试挖航段的回淤量沿时间和空间的变化、以及航道稳定边坡进行分析。结果表明伶仃航道开挖段-15.5 m贯通后,经过2008年1月—2009年1月水沙过程的作用后(其间未进行疏浚),航道内以淤积为主,淤积量较以往(一、二期)没有明显增加。此结论为三期工程的进一步拓宽浚深提供了技术参考。

Analysis of sedimentation after implementation of Lingding channel phase m trial dredging engineering

Based on the analysis of the incoming water and sediment,tide and tidal current characteristics in the Lingdingyang estuary,and combining with four times topographic survey data after phase Ⅲ project of Lingding channel,this paper analyzes the spatial-temporal variation of channel’s siltation amount and slope stability.The results shows that after the transfixion of the 15.5 m dredged channel in Lingdingyang bay,and the flow and sediment process between January 2008 and January 2009(the channel was not dredged during this period),the channel’s main tendency was silting-up,but the sedimentation amount was not increased comparing with the previous project(phaseⅠand Ⅱ).The result presents a technical reference for further widening and deepening of the channel in phase Ⅲ project.