分形维数在判断海洋锋强度中的应用

提出一种用计算维数值预报海洋锋强度的方法。给出了用分形维数描述海洋锋强度的理论依据,介绍了分形维数的计算方法及现有的海洋锋强度的判断方法。应用网格法,以HOOM海洋锋模型和我国东海黑潮锋区的三维声速场数据为例,计算了三维声速场中不同深度、时间的声速等值线的分形维数,得出HOOM模型海洋锋声速场分维值在1.07和1.60之间,我国东海黑潮锋区分维值在1.04和1.30之间,无锋时声速等值线分维接近于1;分形维数可以表征海洋锋强度,维数值随锋强度的变化而变化的结论。

Application of fractal dimension in estimating oceanfront intensity

A method for estimating intensity of oceanfront is proposed.The theoretic basis using fractal dimension to describe oceanfront intensity is first presented.Computation of fractal dimension and the way of judging oceanfront intensity are briefly described.By applying the box counting method,fractal dimensions of the sound speed isolines of the HOOM model and the east sea kuroshio at different time with the different depths are calculated.The results show that the fracal dimension of the HOOM model is between 1.07 and 1.60,and that of the east sea kuroshio is between 1.04 and 1.30.In the absence of oceanfront,it is close to 1.0.It is concluded that fractal dimension can be used to describe oceanfront,and the fractal dimension changes with the oceanfront intensity.