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根据Taylor的湍流扩散理论,按Hay和Pasquil提出的拉格朗日流和欧拉流自相关函数的相似性,用实测流资料,求出潮流场的水平湍流扩散系数和功率谱密度分布。计算结果表明:在沿岸潮流显著的海域水平扩散系数主要是受潮流的影响。其特征是水平扩散系数值随深度的增加而减小;随时间变化而不同.东分量在105cm2/s量级左右;北分量在105cm2/s量级左右,整个海域变化趋势是由岸边向外和由东向西递增.
According to Taylor’s theory of turbulent diffusion, according to Hay and Pasquil’s similarity of Lagrange and Euler flow auto-correlation functions, the horizontal turbulent diffusion coefficient and power spectral density distribution of tidal flow field are obtained by using measured data. The calculation results show that the horizontal diffusion coefficient in the coastal waters with significant tidal current is mainly affected by the tidal current. Its characteristic is that the horizontal diffusion coefficient decreases with depth and varies with time.The east component is about 105cm2 / s, the north component is about 105cm2 / s, and the variation of the whole sea area is from the shore Outside and from east to west increase.