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中文摘要：
本文将斜对角笛卡尔方法推广应用到河口与海岸温排水三维数值计算中。研究首先基于EFDC模块采用的垂线σ坐标变换和平面正交曲线坐标变换,对曲折多变的岸边界构造成各种四边形及三角形计算网格,并采用斜对角笛卡尔差分方法进行数值离散。利用上述方法模拟了山东海阳核电厂附近海域的三维水流运动情况,结果与实测值拟合较好;根据水温与水体密度的关系,计算了不同工况下电厂温排水的三维扩散范围,分析了不同排水口位置对扩散范围的影响,所得取水口温升与物理试验值基本一致。研究表明该方法具有计算精度高、收敛快、节省计算工作量等优点,可以应用到河口海岸区域大规模潮流及温排水工程的数值计算中。
英文摘要：
In this paper, the diagonal Cartesian method is applied in the three-dimensional numerical calculation of thermal discharge in estuary and coast. Based on the σ vertical coordinates and ＂horizontal orthogonal curvilinear coordinate system utilized in EFDC model, it constructs quadrangular and triangular grids on the complex boundaries. Then the diagonal Cartesian differencing method is used for discretization. This method is applied to calculate the three-dimensional flow field near the nuclear power plant of Haiyang in Shandong Province, and the calculating result agrees well with the measurement. Also, based on the relationship between water temperature and density, the three-dimensional diffusion of thermal discharge under different cases is simulated, Analyzing the diffusion extent influenced by different outlet and the rising temperature in the inlet, it is consistent with the physical experiment. It shows that this method takes the advantages of high precision, good cbnvergence, and less worktime and it can be applied in the numerical calculation of tidal current and thermal discharge projects in estuary and coast.
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