天海达工程建设对附近海域水环境影响预测分析

运用三维海洋模型FVCOM(Finite-Volume Coastal Ocean Model),采用有限体积计算方法,引入了干、湿判断,建立了天海达工程附近海域的三维潮流和泥沙输移模型,预测分析了天海达工程建设后对附近海域水动力和地形冲淤的影响。结果表明工程建设后对其西侧潮流影响较大,东侧与南侧影响较小,且随着距离的增加,影响程度减小,在距离工程1200 m以外海域流速相对变化值大约在8%以内;工程建设前后,静风条件下,工程附近海域地形变化趋势基本一致,但由于岸线的改变,工程东西两侧500m范围内近岸海域淤积程度增大,淤积增大幅度范围为0.05～0.1 cm/a。

Prediction and Analysis of Marine Environmental Impact by Tianhaida Engineering Project

Based on Finite-volume Coastal Ocean Model（FVCOM for short）,a 3-dimensional tide and sand transport model for the sea area adjacent to Tianhaida engineering location is established.Then the finite-volume algorithm is adopted and the dry/wet criterion is introduced into the model to predict and analyze the hydrodynamic environmental impact and the effects on erosion or deposition caused by Tianhaida engineering project. It is shown in the model results that the impact on the tidal current become strengthened in the sea area west of the engineering location after the project has been completed,and weakened in the sea area to its south or east.The impact becomes weaker in the further seaward area.The relative variability of current speed is limited within 8%in the sea area 1 200 m away from the engineering location.The sea bottom topography in the post-engineering period has its spatial variability similar to that in the pre-engineering period if it is windless.However the shoreline changes due to the engineering completion will result in faster deposition in the coastal sea area less than 500 m eastward or westward from the engineering location,and the deposition fate ranges between 0.05 cm/a and 0.1 cm/a.