横沙东滩圈围八期工程实施对周边河势的影响初步研究

Influence of Hengsha east siltation and reclamation phase 8 project on surrounding river regime

针对横沙东滩圈围八期工程实施对工程附近水域产生的影响,采用河势分析方法对工程实施后的2017—2021年水沙及地形冲淤变化进行定量分析。结果表明:1)洪季北港落潮分流比介于52.4%~55.9%,总体无趋势性变化;2)北槽、北港中下段主槽及横沙浅滩延续2010年以来冲淤态势;3)北港下段主槽深泓有所南偏且更加平顺;4)横沙通道容积保持稳定。此外,N 23潜堤头部及临近潜堤的横沙浅滩北沿冲刷明显,需继续关注。

In view of the impact of the implementation of the Hengsha east siltation and reclamation Phase 8 project on the nearby waters,the river regime analysis method is used to quantitatively analyze the changes of water,sediment and topographic erosion and deposition during 2017-2021 after the implementation of the project.The results show as follows:1)In the flood season,the diversion ratio of ebb tide in the North Passage is between 52.4%and 55.9%,and there is no overall trend change.2)North Passage,the lower section of North Channel and Hengsha Shoal continue the erosion and deposition trend since 2010.3)The thalweg of the lower section of North Channel is southward and smoother.4)Hengsha channel volume remains stable.In addition,the head of the N23 submerged breakwater and the northern edge of the Hengsha shoal near the submerged breakwater are scoured obviously,which requires continued attention.