系统聚类分析在现代沉积环境划分中的应用--以崎岖列岛海区为例

根据崎岖列岛海区现代沉积物的分选系数、砂粒含量和粘粒含量 3个粒度特征参数,采用系统聚类分析方法划分现代沉积环境,与已知的沉积环境特征信息较为吻合。除水动力条件外,研究区的现代沉积环境深受物源条件和地形因素的影响。在有效划分研究区现代沉积环境的 3个粒度参数中,砂粒含量是受物源条件影响最为显著的参数,分选是对地形与流场相互作用最为敏感的参数。偏度对研究区沉积环境差异的敏感性是有限的。峰度几乎不能作为研究区沉积环境划分的粒度参数。水动力条件的特殊性值得在沉积环境的划分中予以足够重视。

Application of System Cluster Analysis to Classification of Modern Sedimentary Environment---A Case Study in Qiqu Archipelago Area

By system cluster analysis on sorting coefficient, percentage of sand and clay i n modern sediments, The modern sedimentary environment in Qiqu Archipelago area can be well classified into three types of sub-environments, which are in line with the environmental features there. In addition to hydrodynamic function, sediment ary environment is strongly affected by material sources and topography. Among 3 factors by which sedimentary environment is well classified, the factor of perc entage of sand is the variable which is most significantly affected by material sources, and sorting coefficient is the parameter which is most sensible to the reciprocal functions between currents and topography. The sensibility of skewnes s to variation of sedimentary environment is finite. Kurtosis can hardly be used to classify sedimentary environment. Particular hydrodynamic condition should b e also taken into account.