泉州湾表层沉积物粒度特征分析  

Characteristics of grain sizes in surface sediments of Quanzhou Bay

作　　者：王兆夺[1] 于东生[1] 

机构地区：[1]国家海洋局第三海洋研究所,福建厦门361005

出　　处：《应用海洋学学报》2015年第3期326-333,共8页Journal of Applied Oceanography

基　　金：国家自然科学基金资助项目(40976037)

摘　　要：本文利用福建省泉州湾海域采集的70个表层沉积物样品,分析了泉州湾表层沉积物粒度参数的平面分布特征及输运趋势.对沉积物的粒度参数进行了Q型聚类分析,开展了沉积物曲线特征在横向上的分布研究,并针对沉积物不同粒级组分对沉积物来源做了R型因子分析.粒度分析结果表明,不同粒度参数(平均粒径、分选系数、偏态、峰态)在横向上具有不同的变化特征,很大程度上受到潮汐水流的影响,同时入海河口、岛屿周边和局部凸凹岸都会成为其影响因素.沉积物输运趋势分析结果显示,沉积物主要来源于晋江和洛阳江的输入、研究区南侧海岸侵蚀物向北运移后的沉积及外海海流的带入;Q型聚类分析把沉积物分为两群四类,能很好地反应出沉积物粒度概率曲线的变化特征;R型因子分析进一步探讨了沉积物粒度特征可能的影响因素,以陆源碎屑特征和水动力变化影响为主,其次是生物碎屑沉积和人工采砂.A total of 70 surface sediment samples from Quanzhou Bay,Fujian Province,were analyzed for the horizontal distribution of grain size and its transport trends. Analysis of Q cluster for the grain size parameter and for the distribution of sediment curve characteristics on the transverse were carried out. Besides,analysis of R factors was conducted for the sediment provenance according to the size compositions. The results of grain size analysis show that different grain size parameters（ Mean grain size,Coefficients of sorting,Skewness and Kurtosis） have different characteristics horizontally,which are influenced by tidal flows,estuaries,surrounding islands and local convexconcave shores. The trend of grain size transport shows that the main sources of sediments were from inputs of Jinjiang river,Luoyang river and from the northward moving sedimentation due to the south coastal erosion and the offshore input by the currents. The sediments are categorized into 4 groups of 2 by Q type clustering,which coincide well the characteristics of sediment grain size probability curves. This paper further discusses the factors possibly influencing the sediment granularity characteristics with R factor analysis. It shows that the primary influences are terrigenous clastic and hydrodynamic changes and the second,bioclast deposits and sand mining.

关 键 词：海洋地质学 粒度参数 粒径趋势 Q型聚类分析 R型因子分析 沉积物概率曲线 泉州湾 

分 类 号：P736[天文地球—海洋地质]