外钓光汇石油基地工程水动力及海床冲淤数值模拟分析

Numerical Simulation of the Hydrodynamic Environment and Seabed Erosion-Deposition of Brightoil Petroleum Bases Engineering in Waidiao Island

外钓光汇石油基地工程位于舟山外钓山岛南侧,建设内容包括基地填海工程、工作船码头和3 000 t级油品码头。工程建设会对附近海域的水动力及海床冲淤造成一定程度的影响。本文利用Delft3D建立了工程区附近海域二维水动力数值模型,结合实测潮位、潮流资料,对该模型进行了验证,进而定量计算了基地工程实施后附近海域的潮流和海床冲淤变化。结果表明,在工程区东侧围堤和码头后方,涨、落潮流速明显减小,幅度为20%～40%,相应地海床趋于淤积,最终淤积厚度为0.8～1.2 m;码头对岸老塘山港区前沿的涨、落潮流速有所增加,幅度为5%～20%,相应地海床趋于冲刷,最终冲刷厚度为0.4～0.5 m。

Waidiao brightoil petroleum base is located on the south side of Waidiao island of Zhoushan. The construction includes the base reclamation project, the working ship terminal and the 3000 ton oil terminal. The engineering construction will have a certain impact on the hydrodynamic and seabed erosion-deposition in the surrounding sea area. In this paper, a two-dimensional hydrodynamic numerical model of the adjacent engineering sea area is established by Delft3D, and the model is verified with the measured tide level and current data. Then the change of current and erosion-deposition caused by the engineering is calculated quantitatively. The results show that the velocity of flood and ebb tide current decreases obviously by 20%-40% near the east dike and behind the wharf, with the seabed tending to silt up 0.8-1.2 m. While, the velocity of flood and ebb tide current increases by 5%-20% in the wharf apron of Laotangshan port, with the seabed tending to scouring 0.4-0.5 m.