南京大学学报(自然科学版) ›› 2010, Vol. 46 ›› Issue (6): 654663.
张继才 1 ** , 吕咸青 2 , 孙丽艳 3
(
Zhang Ji Cai 1 , Lu Xian Qing 2 , Sun Li Yan 3
摘要: 将基于数学物理反问题的四维变分同化技术应用到陆架浅海区正压潮流的三维数值模拟中. 孪生实验结果表明, 借助伴随同化技术, 三维正压潮流模型的水位开边界条件可成功反演. 实际实验同
化从 TOPEX/ Poseidon 高度计资料提取的潮汐调和常数, 通过反演水位的第一边值开边界条件, 数值模拟了渤海和黄海的 M 2 潮汐潮流. 同化后代价函数以及代价函数关于开边界 Fourier 系数的梯度的值均
大幅度下降, 证明了伴随同化方法的有效性. 实验过程中潮流资料未参与同化, 但由其表达的代价函数值仍然由1 下降至 0 09, 表明从高度计数据反演陆架浅海区的潮流场具有高度的可行性. 与其它工作相
比, 潮流模拟值与观测值之间的误差较小, 所得同潮图及潮流椭圆分布图准确体现了渤海和黄海 M 2 潮汐潮流的基本特征. 本文工作表明伴随同化方法可有效提高潮流数值模拟的准确度.
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