瓯江口航道二期治理潜堤工程三维潮流数值模拟

摘要

基于MIKE3技术平台,建立了瓯江口工程海域三维潮流数学模型.模型水平采用无结构的三角形网格系统,垂向采用(σ)坐标,较好地拟合了工程海域复杂的岛屿岸线和地形特征.采用现场实测水文资料,对瓯江口航道二期治理潜堤工程实施后的三维流场进行了模拟,并分析了工程实施后的影响.工程实施后,瓯江北口航道、沙头水道、小门水道、大门岛和小门岛间水域流速略有变化,其他水域则基本不 变.附近海区高低潮位变幅为0～2 cm.从对周围水动力影响角度考虑,工程是可行的.%Based on MIKE3 technology platform,the mathematical model of 3D tidal current in the Oujiang estuary waters was set up.The unstructured triangular grid system was adopted in horizontal plane,while in the vertical direction,σ coordinate system was used.The complicated island coastline and terrain features were well fitted by using the model. On the basis of field hydrological data,the 3D flow field after the implementation of submerged breakwater project in the Oujiang estuary channel was simulated,then the effect of the project was analyzed. After the implementation of the project,the flow velocity changes slightly in the north branch of the Oujiang estuary channel,Shatou channel,Xiaomen channel and the waters between the Damen island and Xiaomen island,while the flow velocity remains constant in the other areas.The changes of high and low tidal level in each station are between 0～2 cm after the project. From the impact on the surrounding waters,the project is feasible.