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一种新的底摩擦系数处理方法是假定底摩擦系数具有空间分布特征,即在海区中选取一些点作为独立底摩擦系数,计算区域中任意点的底摩擦系数都可由这些独立底摩擦系数通过线性插值得到。采用伴随同化方法对空间分布底摩擦系数的研究表明,与传统的底摩擦系数处理方法相比,空间分布的底摩擦系数模拟精度更高。探讨了根据地形的空间分布特征选取独立底摩擦系数的做法,所做的孪生实验和实际实验均表明,与均匀选取的结果相比,在独立变量个数减少三分之一的情况下,数值模拟的精度反而得以提高。得到的渤、黄、东海底摩擦系数分布表明,东海等深水区及地形复杂的区域底摩擦系数比较大。
A new method for calculating the bottom friction coefficient is to assume that the bottom friction coefficient has a spatial distribution characteristic, that is, selecting some points in the sea area as independent bottom friction coefficients, and the bottom friction coefficient at any point in the calculation area can be calculated from these independent bottom friction coefficients through linear Interpolation is obtained. The research on the bottom friction coefficient of the spatial distribution using the concomitant assimilation method shows that compared with the traditional bottom friction coefficient method, the bottom friction coefficient of the spatial distribution has higher simulation accuracy. The method of selecting the coefficient of independent bottom friction according to the spatial distribution of the terrain is discussed. The twin experiments and practical experiments show that compared with the results of uniform selection, when the number of independent variables decreases by one third, Instead, the accuracy of the simulation is improved. The distributions of the friction coefficients of the Bohai Sea, Yellow Sea and the East Sea show that the bottom friction coefficient is relatively large in the deep sea areas such as the East China Sea and the complex terrain.