连云港近岸海域沉积物粒度的分形特性

Fractal Characteristics of Grain Size Distribution in Lianyungang Coastal Waters

基于粒度数据，运用分形和多重分形理论对连云港近岸海域沉积物粒度分布的分形特性进行了分析，研究了粒度分布的分维变化和多重分形参数的空间分布。结果表明，连云港近岸海域沉积物粒度分布具有分形和多重分形特性。粒度单形分维值介于2．205～2．406之间，平均值为2．312，分维值与0．6～8μm粒级含量呈正相关，描述了粒径分布的整体特征。多重分形谱宽△a在1．668～3．934之间，△f值在0．979～1．378之间，定量表征了粒径分布的非均匀性和奇异性。空间上，单形分维值具有随深度增加而减小的趋势，△a高值多分布在近岸，粒度分维特性空间变化从粒度分布的内在结构反映了沉积物的动力改造过程，指示了不同的沉积环境。

Based on grain size data, the fractal anyungang coastal waters were analyzed using characteristics of sediment grain size distributions in Li fractal and multi-fractal theory, and the spatial distribu tions of the fractal dimensions and multifractal parameters of the grain size were also studied. Results showed that the grain size distributions in Lianyungang coastal waters had fractal and multifractal char- acteristics. The fractal dimension values were between 2. 205~2. 406, with the mean value was 2. 312, and it was positive correlation with the particle contents of 0.6~8μm, which reflect the grain size dis- tributions on the whole. The parameters of multifractal spectrum As were bewteen 1. 668~3. 934, and the values of Af were bewteen 0. 979~1. 378, which quantitatively reflect the spatial heterogeneity and the singularity of the particle size distributions. There was a trend that the values of the fractal dimen- sions were decreased with increasing depth. Most of the higher values of Aa was distributed nearshore. The spatial fractal characteristics which reflected the dynamic process of sediment reworking from the internal structure of particle size distributions indicate the different depositional environments.