对数比转换与系统聚类方法应用于北黎湾沉积环境分区

Classification of sedimentary environment based on logratio transformation and system cluster: a case study of the Beili Bay

基于沉积物粒度组分的沉积环境分区是理解区域沉积动力过程的重要基础。利用海南岛西部北黎湾海域采集的185个表层沉积物样品,运用对数比转换方法处理沉积物组分数据,并分别对处理前后的数据进行聚类分析。结果表明,应用对数比转换方法可获得更优的沉积物聚类效果;基于沉积物的聚类结果可将研究区域划分为4个沉积物环境亚区,即残积沉积区、砂质沉积区、混合沉积区和泥质沉积区。研究结果对于深入理解北黎湾演变的沉积动力过程和开发利用具有参考价值。

Subdivision of sedimentary dynamic environment based on grain-size components is an important basis for understanding regional sedimentary dynamic processes. Based on a total of 185 sediment samples collected from the nearshore of the Beili Bay in the western Hainan Island, the logratio transformation method is used to analyze the sediment grain-size composition, and the cluster analysis is applied on both raw sediment data and logratio transformed data for comparison. The results show that the sedimentary dynamic environment map, generated from the logratio transformation is highly identical with the spatial distribution pattern of the sedimentary dynamics in the study area. The Beili Bay can be well classified into 4 types of sub-environments, including the relict sediment area, mixed sediment area, sandy area and muddy area. The results of the study will be the reference for the profound understanding of sediment dynamics and the development of the Beili Bay.