基于模糊聚类方法的黄渤海表层沉积物物源和输移路径的磁性诊断

Study on provenance and transport of sediments in the Huanghai and Bohai Seas has aroused high attention due to its important role in the global changes and sea-land interactions and its difficulty in the source and sink processes. However, there exist many uncertainties on the recognization of the sources and transprts because limitation of study areas in previous studies and weak sensitivites of trance minerals detection. Researcheres have found during recent decades that magnetic properties of sediments are sensitive to the varied source sediments. Using magnetic parameters and C-fussy cluster analysis, this study will classify different source sediments and present their distribution patterns. This study will also explore the formation mechanism of the distribution patterns and transport pathways of various source sediments combining with analysis of hydrologic and hydrodynamic data and particle size. The results will help to understand the various sources in the the Huanghai and Bohai Seas and intergrated tranpsrt pathway of terrigenous sediment from estuary to shelf, and contribute to the study of marine ecological enrivonment in the Huanghai and Bohai Seas.

黄渤海沉积物的来源和输运因其在全球变化和海陆相互作用研究中的重要地位，以及源汇过程中研究难度大而倍受关注。由于以往研究中所关注范围的局限性以及示踪矿物检测的敏感性较弱等问题，对其物源和输运的认识一直存在较多不确定性。本研究以对不同物源非常敏感的沉积物磁学性质为示踪，通过对黄渤海大面积海区表层沉积物磁学参数的C 均值模糊聚类的统计分析，阐明表层沉积物的磁学性质分类和分布格局，进而探讨黄渤海区沉积物的不同来源；同时结合主要河口区沉积物磁性、研究区水文和水动力资料、沉积物粒度以及磁性矿物形成原因的分析，揭示表层沉积物磁性特征的分布规律和沉积物输运路径的控制机理。研究结果有助于正确认识黄渤海沉积物的不同物源以及陆源沉积物从河口到陆架的输运路径，同时也为黄渤海区域的海洋生态环境研究提供有意义的帮助。

边缘海的沉积环境因其在全球变化和海陆相互作用研究中的重要地位，以及源汇过程中研究难度大而受到高度关注。由于以往研究中示踪矿物的敏感性较弱以及研究范围的局限性，对其物源等沉积环境的认识一直存在较多不确定性。近几十年来研究者逐渐注意到沉积物中磁性颗粒对不同的沉积环境判别非常敏感。本研究以黄渤海大面积海区表层沉积物磁性矿物变化为示踪，通过多个磁学参数的C均值模糊聚类分析，对黄渤海表层沉积物磁学性质进行分区。同时结合主要河口区沉积物磁性、研究区水文和水动力资料、沉积物粒度、沉积物氧化还原环境及磁性颗粒的矿物学鉴定，阐明磁性的分布格局与这些沉积环境因素的关系，从而揭示表层沉积物磁性特征分布规律对沉积环境的指示意义。研究结果有助于正确认识黄渤海的物源以及陆源沉积物从河口到陆架完整的输运路径，同时也为黄渤海区域的海洋生态环境研究提供有意义的帮助。