鱼山大桥工程海洋环境影响分析

Impact of Yushan Bridge project on marine environment

通过MIKE21FM建立了平面二维潮流数学模型,分析了鱼山大桥建设对周边海域水动力和冲淤环境的影响。结合海洋环境质量现状调查资料,探讨了桩基施工及其产生的悬浮泥沙对生态和渔业资源的影响。结果表明,鱼山大桥的建设使大桥轴线两侧的潮流流速减小约1~2.5 cm/s,并伴随有0.2~1 m的淤积,而主通航孔水域增加约0.5~1.5cm/s,并出现0.4~1.5 m的冲刷。同时,桩基施工所引起的悬浮泥沙会使浮游生物、底栖生物、潮间带生物和渔业资源造成不同程度的损失,但这种影响在施工结束后就会消除。

We established the 2-D tidal flow mathematical model using MIKE21FM, and analyzed the impact of Yushan Bridgeon hydrodynamic and erosion -deposition environment. Based on the survey data of marine environment, we discussed theinfluence of the pile foundation construction and its resulting suspended sediment on ecology and fishery resources. The resultindicates the current velocity on both sides of Yushan Bridge will decreases by 1~2.5 cm/s, with the deposition thickness 0.2~1m, while it increases by 0.5~1.5 cm/s in main navigable hole, with the erosion thickness 0.4~1.5 m. Meanwhile, the suspendedsediment from pile foundation construction will causes various degrees of damages to plankton, benthos, intertidal creatures, andfishery resources, but the damages will disappear after construction.